| /* |
| * Copyright (c) 2016-2017, The Linux Foundation. All rights reserved. |
| * |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License version 2 and |
| * only version 2 as published by the Free Software Foundation. |
| * |
| * This program is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| * GNU General Public License for more details. |
| * |
| */ |
| |
| #include <linux/of.h> |
| #include <linux/delay.h> |
| #include <linux/slab.h> |
| #include <linux/msm-bus.h> |
| #include "dsi_clk.h" |
| |
| struct dsi_core_clks { |
| struct dsi_core_clk_info clks; |
| u32 bus_handle; |
| }; |
| |
| struct dsi_link_clks { |
| struct dsi_link_clk_info clks; |
| struct link_clk_freq freq; |
| }; |
| |
| struct dsi_clk_mngr { |
| char name[MAX_STRING_LEN]; |
| struct mutex clk_mutex; |
| struct list_head client_list; |
| |
| u32 dsi_ctrl_count; |
| u32 master_ndx; |
| struct dsi_core_clks core_clks[MAX_DSI_CTRL]; |
| struct dsi_link_clks link_clks[MAX_DSI_CTRL]; |
| u32 ctrl_index[MAX_DSI_CTRL]; |
| u32 core_clk_state; |
| u32 link_clk_state; |
| |
| pre_clockoff_cb pre_clkoff_cb; |
| post_clockoff_cb post_clkoff_cb; |
| post_clockon_cb post_clkon_cb; |
| pre_clockon_cb pre_clkon_cb; |
| |
| void *priv_data; |
| }; |
| |
| struct dsi_clk_client_info { |
| char name[MAX_STRING_LEN]; |
| u32 core_refcount; |
| u32 link_refcount; |
| u32 core_clk_state; |
| u32 link_clk_state; |
| struct list_head list; |
| struct dsi_clk_mngr *mngr; |
| }; |
| |
| static int _get_clk_mngr_index(struct dsi_clk_mngr *mngr, |
| u32 dsi_ctrl_index, |
| u32 *clk_mngr_index) |
| { |
| int i; |
| |
| for (i = 0; i < mngr->dsi_ctrl_count; i++) { |
| if (mngr->ctrl_index[i] == dsi_ctrl_index) { |
| *clk_mngr_index = i; |
| return 0; |
| } |
| } |
| |
| return -EINVAL; |
| } |
| |
| /** |
| * dsi_clk_set_link_frequencies() - set frequencies for link clks |
| * @clks: Link clock information |
| * @pixel_clk: pixel clock frequency in KHz. |
| * @byte_clk: Byte clock frequency in KHz. |
| * @esc_clk: Escape clock frequency in KHz. |
| * |
| * return: error code in case of failure or 0 for success. |
| */ |
| int dsi_clk_set_link_frequencies(void *client, struct link_clk_freq freq, |
| u32 index) |
| { |
| int rc = 0, clk_mngr_index = 0; |
| struct dsi_clk_client_info *c = client; |
| struct dsi_clk_mngr *mngr; |
| |
| if (!client) { |
| pr_err("invalid params\n"); |
| return -EINVAL; |
| } |
| |
| mngr = c->mngr; |
| rc = _get_clk_mngr_index(mngr, index, &clk_mngr_index); |
| if (rc) { |
| pr_err("failed to map control index %d\n", index); |
| return -EINVAL; |
| } |
| |
| memcpy(&mngr->link_clks[clk_mngr_index].freq, &freq, |
| sizeof(struct link_clk_freq)); |
| |
| return rc; |
| } |
| |
| /** |
| * dsi_clk_set_pixel_clk_rate() - set frequency for pixel clock |
| * @clks: DSI link clock information. |
| * @pixel_clk: Pixel clock rate in KHz. |
| * |
| * return: error code in case of failure or 0 for success. |
| */ |
| int dsi_clk_set_pixel_clk_rate(void *client, u64 pixel_clk, u32 index) |
| { |
| int rc = 0; |
| struct dsi_clk_client_info *c = client; |
| struct dsi_clk_mngr *mngr; |
| |
| mngr = c->mngr; |
| rc = clk_set_rate(mngr->link_clks[index].clks.pixel_clk, pixel_clk); |
| if (rc) |
| pr_err("failed to set clk rate for pixel clk, rc=%d\n", rc); |
| else |
| mngr->link_clks[index].freq.pix_clk_rate = pixel_clk; |
| |
| return rc; |
| } |
| |
| /** |
| * dsi_clk_set_byte_clk_rate() - set frequency for byte clock |
| * @client: DSI clock client pointer. |
| * @byte_clk: Pixel clock rate in Hz. |
| * @index: Index of the DSI controller. |
| * return: error code in case of failure or 0 for success. |
| */ |
| int dsi_clk_set_byte_clk_rate(void *client, u64 byte_clk, u32 index) |
| { |
| int rc = 0; |
| struct dsi_clk_client_info *c = client; |
| struct dsi_clk_mngr *mngr; |
| |
| mngr = c->mngr; |
| rc = clk_set_rate(mngr->link_clks[index].clks.byte_clk, byte_clk); |
| if (rc) |
| pr_err("failed to set clk rate for byte clk, rc=%d\n", rc); |
| else |
| mngr->link_clks[index].freq.byte_clk_rate = byte_clk; |
| |
| return rc; |
| |
| } |
| |
| /** |
| * dsi_clk_update_parent() - update parent clocks for specified clock |
| * @parent: link clock pair which are set as parent. |
| * @child: link clock pair whose parent has to be set. |
| */ |
| int dsi_clk_update_parent(struct dsi_clk_link_set *parent, |
| struct dsi_clk_link_set *child) |
| { |
| int rc = 0; |
| |
| rc = clk_set_parent(child->byte_clk, parent->byte_clk); |
| if (rc) { |
| pr_err("failed to set byte clk parent\n"); |
| goto error; |
| } |
| |
| rc = clk_set_parent(child->pixel_clk, parent->pixel_clk); |
| if (rc) { |
| pr_err("failed to set pixel clk parent\n"); |
| goto error; |
| } |
| error: |
| return rc; |
| } |
| |
| int dsi_core_clk_start(struct dsi_core_clks *c_clks) |
| { |
| int rc = 0; |
| |
| if (c_clks->clks.mdp_core_clk) { |
| rc = clk_prepare_enable(c_clks->clks.mdp_core_clk); |
| if (rc) { |
| pr_err("failed to enable mdp_core_clk, rc=%d\n", rc); |
| goto error; |
| } |
| } |
| |
| if (c_clks->clks.mnoc_clk) { |
| rc = clk_prepare_enable(c_clks->clks.mnoc_clk); |
| if (rc) { |
| pr_err("failed to enable mnoc_clk, rc=%d\n", rc); |
| goto error_disable_core_clk; |
| } |
| } |
| |
| if (c_clks->clks.iface_clk) { |
| rc = clk_prepare_enable(c_clks->clks.iface_clk); |
| if (rc) { |
| pr_err("failed to enable iface_clk, rc=%d\n", rc); |
| goto error_disable_mnoc_clk; |
| } |
| } |
| |
| if (c_clks->clks.bus_clk) { |
| rc = clk_prepare_enable(c_clks->clks.bus_clk); |
| if (rc) { |
| pr_err("failed to enable bus_clk, rc=%d\n", rc); |
| goto error_disable_iface_clk; |
| } |
| } |
| |
| if (c_clks->clks.core_mmss_clk) { |
| rc = clk_prepare_enable(c_clks->clks.core_mmss_clk); |
| if (rc) { |
| pr_err("failed to enable core_mmss_clk, rc=%d\n", rc); |
| goto error_disable_bus_clk; |
| } |
| } |
| |
| if (c_clks->bus_handle) { |
| rc = msm_bus_scale_client_update_request(c_clks->bus_handle, 1); |
| if (rc) { |
| pr_err("bus scale client enable failed, rc=%d\n", rc); |
| goto error_disable_mmss_clk; |
| } |
| } |
| |
| return rc; |
| |
| error_disable_mmss_clk: |
| clk_disable_unprepare(c_clks->clks.core_mmss_clk); |
| error_disable_bus_clk: |
| clk_disable_unprepare(c_clks->clks.bus_clk); |
| error_disable_iface_clk: |
| clk_disable_unprepare(c_clks->clks.iface_clk); |
| error_disable_mnoc_clk: |
| if (c_clks->clks.mnoc_clk) |
| clk_disable_unprepare(c_clks->clks.mnoc_clk); |
| error_disable_core_clk: |
| clk_disable_unprepare(c_clks->clks.mdp_core_clk); |
| error: |
| return rc; |
| } |
| |
| int dsi_core_clk_stop(struct dsi_core_clks *c_clks) |
| { |
| if (msm_bus_scale_client_update_request(c_clks->bus_handle, 0)) |
| pr_err("bus scale client disable failed\n"); |
| clk_disable_unprepare(c_clks->clks.core_mmss_clk); |
| clk_disable_unprepare(c_clks->clks.bus_clk); |
| clk_disable_unprepare(c_clks->clks.iface_clk); |
| if (c_clks->clks.mnoc_clk) |
| clk_disable_unprepare(c_clks->clks.mnoc_clk); |
| clk_disable_unprepare(c_clks->clks.mdp_core_clk); |
| |
| return 0; |
| } |
| |
| static int dsi_link_clk_set_rate(struct dsi_link_clks *l_clks) |
| { |
| int rc = 0; |
| |
| rc = clk_set_rate(l_clks->clks.esc_clk, l_clks->freq.esc_clk_rate); |
| if (rc) { |
| pr_err("clk_set_rate failed for esc_clk rc = %d\n", rc); |
| goto error; |
| } |
| |
| rc = clk_set_rate(l_clks->clks.byte_clk, l_clks->freq.byte_clk_rate); |
| if (rc) { |
| pr_err("clk_set_rate failed for byte_clk rc = %d\n", rc); |
| goto error; |
| } |
| |
| rc = clk_set_rate(l_clks->clks.pixel_clk, l_clks->freq.pix_clk_rate); |
| if (rc) { |
| pr_err("clk_set_rate failed for pixel_clk rc = %d\n", rc); |
| goto error; |
| } |
| |
| /* |
| * If byte_intf_clk is present, set rate for that too. |
| * For DPHY: byte_intf_clk_rate = byte_clk_rate / 2 |
| * todo: this needs to be revisited when support for CPHY is added |
| */ |
| if (l_clks->clks.byte_intf_clk) { |
| rc = clk_set_rate(l_clks->clks.byte_intf_clk, |
| (l_clks->freq.byte_clk_rate / 2)); |
| if (rc) { |
| pr_err("set_rate failed for byte_intf_clk rc = %d\n", |
| rc); |
| goto error; |
| } |
| } |
| error: |
| return rc; |
| } |
| |
| static int dsi_link_clk_prepare(struct dsi_link_clks *l_clks) |
| { |
| int rc = 0; |
| |
| rc = clk_prepare(l_clks->clks.esc_clk); |
| if (rc) { |
| pr_err("Failed to prepare dsi esc clk, rc=%d\n", rc); |
| goto esc_clk_err; |
| } |
| |
| rc = clk_prepare(l_clks->clks.byte_clk); |
| if (rc) { |
| pr_err("Failed to prepare dsi byte clk, rc=%d\n", rc); |
| goto byte_clk_err; |
| } |
| |
| rc = clk_prepare(l_clks->clks.pixel_clk); |
| if (rc) { |
| pr_err("Failed to prepare dsi pixel clk, rc=%d\n", rc); |
| goto pixel_clk_err; |
| } |
| |
| if (l_clks->clks.byte_intf_clk) { |
| rc = clk_prepare(l_clks->clks.byte_intf_clk); |
| if (rc) { |
| pr_err("Failed to prepare dsi byte intf clk, rc=%d\n", |
| rc); |
| goto byte_intf_clk_err; |
| } |
| } |
| |
| return rc; |
| |
| byte_intf_clk_err: |
| clk_unprepare(l_clks->clks.pixel_clk); |
| pixel_clk_err: |
| clk_unprepare(l_clks->clks.byte_clk); |
| byte_clk_err: |
| clk_unprepare(l_clks->clks.esc_clk); |
| esc_clk_err: |
| return rc; |
| } |
| |
| static void dsi_link_clk_unprepare(struct dsi_link_clks *l_clks) |
| { |
| if (l_clks->clks.byte_intf_clk) |
| clk_unprepare(l_clks->clks.byte_intf_clk); |
| clk_unprepare(l_clks->clks.pixel_clk); |
| clk_unprepare(l_clks->clks.byte_clk); |
| clk_unprepare(l_clks->clks.esc_clk); |
| } |
| |
| static int dsi_link_clk_enable(struct dsi_link_clks *l_clks) |
| { |
| int rc = 0; |
| |
| rc = clk_enable(l_clks->clks.esc_clk); |
| if (rc) { |
| pr_err("Failed to enable dsi esc clk, rc=%d\n", rc); |
| goto esc_clk_err; |
| } |
| |
| rc = clk_enable(l_clks->clks.byte_clk); |
| if (rc) { |
| pr_err("Failed to enable dsi byte clk, rc=%d\n", rc); |
| goto byte_clk_err; |
| } |
| |
| rc = clk_enable(l_clks->clks.pixel_clk); |
| if (rc) { |
| pr_err("Failed to enable dsi pixel clk, rc=%d\n", rc); |
| goto pixel_clk_err; |
| } |
| |
| if (l_clks->clks.byte_intf_clk) { |
| rc = clk_enable(l_clks->clks.byte_intf_clk); |
| if (rc) { |
| pr_err("Failed to enable dsi byte intf clk, rc=%d\n", |
| rc); |
| goto byte_intf_clk_err; |
| } |
| } |
| |
| return rc; |
| |
| byte_intf_clk_err: |
| clk_disable(l_clks->clks.pixel_clk); |
| pixel_clk_err: |
| clk_disable(l_clks->clks.byte_clk); |
| byte_clk_err: |
| clk_disable(l_clks->clks.esc_clk); |
| esc_clk_err: |
| return rc; |
| } |
| |
| static void dsi_link_clk_disable(struct dsi_link_clks *l_clks) |
| { |
| if (l_clks->clks.byte_intf_clk) |
| clk_disable(l_clks->clks.byte_intf_clk); |
| clk_disable(l_clks->clks.esc_clk); |
| clk_disable(l_clks->clks.pixel_clk); |
| clk_disable(l_clks->clks.byte_clk); |
| } |
| |
| /** |
| * dsi_link_clk_start() - enable dsi link clocks |
| */ |
| int dsi_link_clk_start(struct dsi_link_clks *clks) |
| { |
| int rc = 0; |
| |
| rc = dsi_link_clk_set_rate(clks); |
| if (rc) { |
| pr_err("failed to set clk rates, rc = %d\n", rc); |
| goto error; |
| } |
| |
| rc = dsi_link_clk_prepare(clks); |
| if (rc) { |
| pr_err("failed to prepare link clks, rc = %d\n", rc); |
| goto error; |
| } |
| |
| rc = dsi_link_clk_enable(clks); |
| if (rc) { |
| pr_err("failed to enable link clks, rc = %d\n", rc); |
| goto error_unprepare; |
| } |
| |
| pr_debug("Link clocks are enabled\n"); |
| return rc; |
| error_unprepare: |
| dsi_link_clk_unprepare(clks); |
| error: |
| return rc; |
| } |
| |
| /** |
| * dsi_link_clk_stop() - Stop DSI link clocks. |
| */ |
| int dsi_link_clk_stop(struct dsi_link_clks *clks) |
| { |
| dsi_link_clk_disable(clks); |
| dsi_link_clk_unprepare(clks); |
| |
| pr_debug("Link clocks disabled\n"); |
| |
| return 0; |
| } |
| |
| static int dsi_display_core_clk_enable(struct dsi_core_clks *clks, |
| u32 ctrl_count, u32 master_ndx) |
| { |
| int rc = 0; |
| int i; |
| struct dsi_core_clks *clk, *m_clks; |
| |
| /* |
| * In case of split DSI usecases, the clock for master controller should |
| * be enabled before the other controller. Master controller in the |
| * clock context refers to the controller that sources the clock. |
| */ |
| |
| m_clks = &clks[master_ndx]; |
| rc = sde_power_resource_enable(m_clks->clks.phandle, |
| m_clks->clks.dsi_core_client, true); |
| |
| if (rc) { |
| pr_err("Power resource enable failed, rc=%d\n", rc); |
| goto error; |
| } |
| |
| rc = dsi_core_clk_start(m_clks); |
| if (rc) { |
| pr_err("failed to turn on master clocks, rc=%d\n", rc); |
| goto error_disable_master_resource; |
| } |
| |
| /* Turn on rest of the core clocks */ |
| for (i = 0; i < ctrl_count; i++) { |
| clk = &clks[i]; |
| if (!clk || (clk == m_clks)) |
| continue; |
| |
| rc = sde_power_resource_enable(clk->clks.phandle, |
| clk->clks.dsi_core_client, true); |
| if (rc) { |
| pr_err("Power resource enable failed, rc=%d\n", rc); |
| goto error_disable_master; |
| } |
| |
| rc = dsi_core_clk_start(clk); |
| if (rc) { |
| pr_err("failed to turn on clocks, rc=%d\n", rc); |
| (void)sde_power_resource_enable(clk->clks.phandle, |
| clk->clks.dsi_core_client, false); |
| goto error_disable_master; |
| } |
| } |
| return rc; |
| error_disable_master: |
| (void)dsi_core_clk_stop(m_clks); |
| |
| error_disable_master_resource: |
| (void)sde_power_resource_enable(m_clks->clks.phandle, |
| m_clks->clks.dsi_core_client, false); |
| error: |
| return rc; |
| } |
| |
| static int dsi_display_link_clk_enable(struct dsi_link_clks *clks, |
| u32 ctrl_count, u32 master_ndx) |
| { |
| int rc = 0; |
| int i; |
| struct dsi_link_clks *clk, *m_clks; |
| |
| /* |
| * In case of split DSI usecases, the clock for master controller should |
| * be enabled before the other controller. Master controller in the |
| * clock context refers to the controller that sources the clock. |
| */ |
| |
| m_clks = &clks[master_ndx]; |
| |
| rc = dsi_link_clk_start(m_clks); |
| if (rc) { |
| pr_err("failed to turn on master clocks, rc=%d\n", rc); |
| goto error; |
| } |
| |
| /* Turn on rest of the core clocks */ |
| for (i = 0; i < ctrl_count; i++) { |
| clk = &clks[i]; |
| if (!clk || (clk == m_clks)) |
| continue; |
| |
| rc = dsi_link_clk_start(clk); |
| if (rc) { |
| pr_err("failed to turn on clocks, rc=%d\n", rc); |
| goto error_disable_master; |
| } |
| } |
| return rc; |
| error_disable_master: |
| (void)dsi_link_clk_stop(m_clks); |
| error: |
| return rc; |
| } |
| |
| static int dsi_display_core_clk_disable(struct dsi_core_clks *clks, |
| u32 ctrl_count, u32 master_ndx) |
| { |
| int rc = 0; |
| int i; |
| struct dsi_core_clks *clk, *m_clks; |
| |
| /* |
| * In case of split DSI usecases, clock for slave DSI controllers should |
| * be disabled first before disabling clock for master controller. Slave |
| * controllers in the clock context refer to controller which source |
| * clock from another controller. |
| */ |
| |
| m_clks = &clks[master_ndx]; |
| |
| /* Turn off non-master core clocks */ |
| for (i = 0; i < ctrl_count; i++) { |
| clk = &clks[i]; |
| if (!clk || (clk == m_clks)) |
| continue; |
| |
| rc = dsi_core_clk_stop(clk); |
| if (rc) { |
| pr_debug("failed to turn off clocks, rc=%d\n", rc); |
| goto error; |
| } |
| |
| rc = sde_power_resource_enable(clk->clks.phandle, |
| clk->clks.dsi_core_client, false); |
| if (rc) { |
| pr_err("Power resource disable failed: %d\n", rc); |
| goto error; |
| } |
| } |
| |
| rc = dsi_core_clk_stop(m_clks); |
| if (rc) { |
| pr_err("failed to turn off master clocks, rc=%d\n", rc); |
| goto error; |
| } |
| |
| rc = sde_power_resource_enable(m_clks->clks.phandle, |
| m_clks->clks.dsi_core_client, false); |
| if (rc) |
| pr_err("Power resource disable failed: %d\n", rc); |
| error: |
| return rc; |
| } |
| |
| static int dsi_display_link_clk_disable(struct dsi_link_clks *clks, |
| u32 ctrl_count, u32 master_ndx) |
| { |
| int rc = 0; |
| int i; |
| struct dsi_link_clks *clk, *m_clks; |
| |
| /* |
| * In case of split DSI usecases, clock for slave DSI controllers should |
| * be disabled first before disabling clock for master controller. Slave |
| * controllers in the clock context refer to controller which source |
| * clock from another controller. |
| */ |
| |
| m_clks = &clks[master_ndx]; |
| |
| /* Turn off non-master link clocks */ |
| for (i = 0; i < ctrl_count; i++) { |
| clk = &clks[i]; |
| if (!clk || (clk == m_clks)) |
| continue; |
| |
| rc = dsi_link_clk_stop(clk); |
| if (rc) |
| pr_err("failed to turn off clocks, rc=%d\n", rc); |
| } |
| |
| rc = dsi_link_clk_stop(m_clks); |
| if (rc) |
| pr_err("failed to turn off master clocks, rc=%d\n", rc); |
| |
| return rc; |
| } |
| |
| static int dsi_update_clk_state(struct dsi_core_clks *c_clks, u32 c_state, |
| struct dsi_link_clks *l_clks, u32 l_state) |
| { |
| int rc = 0; |
| struct dsi_clk_mngr *mngr; |
| bool l_c_on = false; |
| |
| if (c_clks) { |
| mngr = |
| container_of(c_clks, struct dsi_clk_mngr, core_clks[0]); |
| } else if (l_clks) { |
| mngr = |
| container_of(l_clks, struct dsi_clk_mngr, link_clks[0]); |
| } else { |
| mngr = NULL; |
| } |
| |
| if (!mngr) |
| return -EINVAL; |
| |
| pr_debug("c_state = %d, l_state = %d\n", |
| c_clks ? c_state : -1, l_clks ? l_state : -1); |
| /* |
| * Below is the sequence to toggle DSI clocks: |
| * 1. For ON sequence, Core clocks before link clocks |
| * 2. For OFF sequence, Link clocks before core clocks. |
| */ |
| if (c_clks && (c_state == DSI_CLK_ON)) { |
| if (mngr->core_clk_state == DSI_CLK_OFF) { |
| rc = mngr->pre_clkon_cb(mngr->priv_data, |
| DSI_CORE_CLK, |
| DSI_CLK_ON); |
| if (rc) { |
| pr_err("failed to turn on MDP FS rc= %d\n", rc); |
| goto error; |
| } |
| } |
| rc = dsi_display_core_clk_enable(c_clks, mngr->dsi_ctrl_count, |
| mngr->master_ndx); |
| if (rc) { |
| pr_err("failed to turn on core clks rc = %d\n", rc); |
| goto error; |
| } |
| |
| if (mngr->post_clkon_cb) { |
| rc = mngr->post_clkon_cb(mngr->priv_data, |
| DSI_CORE_CLK, |
| DSI_CLK_ON); |
| if (rc) |
| pr_err("post clk on cb failed, rc = %d\n", rc); |
| } |
| mngr->core_clk_state = DSI_CLK_ON; |
| } |
| |
| if (l_clks) { |
| if (l_state == DSI_CLK_ON) { |
| if (mngr->pre_clkon_cb) { |
| rc = mngr->pre_clkon_cb(mngr->priv_data, |
| DSI_LINK_CLK, l_state); |
| if (rc) |
| pr_err("pre link clk on cb failed\n"); |
| } |
| rc = dsi_display_link_clk_enable(l_clks, |
| mngr->dsi_ctrl_count, mngr->master_ndx); |
| if (rc) { |
| pr_err("failed to start link clk rc= %d\n", rc); |
| goto error; |
| } |
| if (mngr->post_clkon_cb) { |
| rc = mngr->post_clkon_cb(mngr->priv_data, |
| DSI_LINK_CLK, |
| l_state); |
| if (rc) |
| pr_err("post link clk on cb failed\n"); |
| } |
| } else { |
| /* |
| * Two conditions that need to be checked for Link |
| * clocks: |
| * 1. Link clocks need core clocks to be on when |
| * transitioning from EARLY_GATE to OFF state. |
| * 2. ULPS mode might have to be enabled in case of OFF |
| * state. For ULPS, Link clocks should be turned ON |
| * first before they are turned off again. |
| * |
| * If Link is going from EARLY_GATE to OFF state AND |
| * Core clock is already in EARLY_GATE or OFF state, |
| * turn on Core clocks and link clocks. |
| * |
| * ULPS state is managed as part of the pre_clkoff_cb. |
| */ |
| if ((l_state == DSI_CLK_OFF) && |
| (mngr->link_clk_state == |
| DSI_CLK_EARLY_GATE) && |
| (mngr->core_clk_state != |
| DSI_CLK_ON)) { |
| rc = dsi_display_core_clk_enable( |
| mngr->core_clks, mngr->dsi_ctrl_count, |
| mngr->master_ndx); |
| if (rc) { |
| pr_err("core clks did not start\n"); |
| goto error; |
| } |
| |
| rc = dsi_display_link_clk_enable(l_clks, |
| mngr->dsi_ctrl_count, mngr->master_ndx); |
| if (rc) { |
| pr_err("Link clks did not start\n"); |
| goto error; |
| } |
| l_c_on = true; |
| pr_debug("ECG: core and Link_on\n"); |
| } |
| |
| if (mngr->pre_clkoff_cb) { |
| rc = mngr->pre_clkoff_cb(mngr->priv_data, |
| DSI_LINK_CLK, l_state); |
| if (rc) |
| pr_err("pre link clk off cb failed\n"); |
| } |
| |
| rc = dsi_display_link_clk_disable(l_clks, |
| mngr->dsi_ctrl_count, mngr->master_ndx); |
| if (rc) { |
| pr_err("failed to stop link clk, rc = %d\n", |
| rc); |
| goto error; |
| } |
| |
| if (mngr->post_clkoff_cb) { |
| rc = mngr->post_clkoff_cb(mngr->priv_data, |
| DSI_LINK_CLK, l_state); |
| if (rc) |
| pr_err("post link clk off cb failed\n"); |
| } |
| /* |
| * This check is to save unnecessary clock state |
| * change when going from EARLY_GATE to OFF. In the |
| * case where the request happens for both Core and Link |
| * clocks in the same call, core clocks need to be |
| * turned on first before OFF state can be entered. |
| * |
| * Core clocks are turned on here for Link clocks to go |
| * to OFF state. If core clock request is also present, |
| * then core clocks can be turned off Core clocks are |
| * transitioned to OFF state. |
| */ |
| if (l_c_on && (!(c_clks && (c_state == DSI_CLK_OFF) |
| && (mngr->core_clk_state == |
| DSI_CLK_EARLY_GATE)))) { |
| rc = dsi_display_core_clk_disable( |
| mngr->core_clks, mngr->dsi_ctrl_count, |
| mngr->master_ndx); |
| if (rc) { |
| pr_err("core clks did not stop\n"); |
| goto error; |
| } |
| |
| l_c_on = false; |
| pr_debug("ECG: core off\n"); |
| } else |
| pr_debug("ECG: core off skip\n"); |
| } |
| |
| mngr->link_clk_state = l_state; |
| } |
| |
| if (c_clks && (c_state != DSI_CLK_ON)) { |
| /* |
| * When going to OFF state from EARLY GATE state, Core clocks |
| * should be turned on first so that the IOs can be clamped. |
| * l_c_on flag is set, then the core clocks were turned before |
| * to the Link clocks go to OFF state. So Core clocks are |
| * already ON and this step can be skipped. |
| * |
| * IOs are clamped in pre_clkoff_cb callback. |
| */ |
| if ((c_state == DSI_CLK_OFF) && |
| (mngr->core_clk_state == |
| DSI_CLK_EARLY_GATE) && !l_c_on) { |
| rc = dsi_display_core_clk_enable(mngr->core_clks, |
| mngr->dsi_ctrl_count, mngr->master_ndx); |
| if (rc) { |
| pr_err("core clks did not start\n"); |
| goto error; |
| } |
| pr_debug("ECG: core on\n"); |
| } else |
| pr_debug("ECG: core on skip\n"); |
| |
| if (mngr->pre_clkoff_cb) { |
| rc = mngr->pre_clkoff_cb(mngr->priv_data, |
| DSI_CORE_CLK, |
| c_state); |
| if (rc) |
| pr_err("pre core clk off cb failed\n"); |
| } |
| |
| rc = dsi_display_core_clk_disable(c_clks, mngr->dsi_ctrl_count, |
| mngr->master_ndx); |
| if (rc) { |
| pr_err("failed to turn off core clks rc = %d\n", rc); |
| goto error; |
| } |
| |
| if (c_state == DSI_CLK_OFF) { |
| if (mngr->post_clkoff_cb) { |
| rc = mngr->post_clkoff_cb(mngr->priv_data, |
| DSI_CORE_CLK, |
| DSI_CLK_OFF); |
| if (rc) |
| pr_err("post clkoff cb fail, rc = %d\n", |
| rc); |
| } |
| } |
| mngr->core_clk_state = c_state; |
| } |
| |
| error: |
| return rc; |
| } |
| |
| static int dsi_recheck_clk_state(struct dsi_clk_mngr *mngr) |
| { |
| int rc = 0; |
| struct list_head *pos = NULL; |
| struct dsi_clk_client_info *c; |
| u32 new_core_clk_state = DSI_CLK_OFF; |
| u32 new_link_clk_state = DSI_CLK_OFF; |
| u32 old_c_clk_state = DSI_CLK_OFF; |
| u32 old_l_clk_state = DSI_CLK_OFF; |
| struct dsi_core_clks *c_clks = NULL; |
| struct dsi_link_clks *l_clks = NULL; |
| |
| /* |
| * Conditions to maintain DSI manager clock state based on |
| * clock states of various clients: |
| * 1. If any client has clock in ON state, DSI manager clock state |
| * should be ON. |
| * 2. If any client is in ECG state with rest of them turned OFF, |
| * go to Early gate state. |
| * 3. If all clients have clocks as OFF, then go to OFF state. |
| */ |
| list_for_each(pos, &mngr->client_list) { |
| c = list_entry(pos, struct dsi_clk_client_info, list); |
| if (c->core_clk_state == DSI_CLK_ON) { |
| new_core_clk_state = DSI_CLK_ON; |
| break; |
| } else if (c->core_clk_state == DSI_CLK_EARLY_GATE) { |
| new_core_clk_state = DSI_CLK_EARLY_GATE; |
| } |
| } |
| |
| list_for_each(pos, &mngr->client_list) { |
| c = list_entry(pos, struct dsi_clk_client_info, list); |
| if (c->link_clk_state == DSI_CLK_ON) { |
| new_link_clk_state = DSI_CLK_ON; |
| break; |
| } else if (c->link_clk_state == DSI_CLK_EARLY_GATE) { |
| new_link_clk_state = DSI_CLK_EARLY_GATE; |
| } |
| } |
| |
| if (new_core_clk_state != mngr->core_clk_state) |
| c_clks = mngr->core_clks; |
| |
| if (new_link_clk_state != mngr->link_clk_state) |
| l_clks = mngr->link_clks; |
| |
| old_c_clk_state = mngr->core_clk_state; |
| old_l_clk_state = mngr->link_clk_state; |
| |
| pr_debug("c_clk_state (%d -> %d)\n", |
| old_c_clk_state, new_core_clk_state); |
| pr_debug("l_clk_state (%d -> %d)\n", |
| old_l_clk_state, new_link_clk_state); |
| |
| if (c_clks || l_clks) { |
| rc = dsi_update_clk_state(c_clks, new_core_clk_state, |
| l_clks, new_link_clk_state); |
| if (rc) { |
| pr_err("failed to update clock state, rc = %d\n", rc); |
| goto error; |
| } |
| } |
| |
| error: |
| return rc; |
| } |
| |
| int dsi_clk_req_state(void *client, enum dsi_clk_type clk, |
| enum dsi_clk_state state) |
| { |
| int rc = 0; |
| struct dsi_clk_client_info *c = client; |
| struct dsi_clk_mngr *mngr; |
| bool changed = false; |
| |
| if (!client || !clk || clk > (DSI_CORE_CLK | DSI_LINK_CLK) || |
| state > DSI_CLK_EARLY_GATE) { |
| pr_err("Invalid params, client = %pK, clk = 0x%x, state = %d\n", |
| client, clk, state); |
| return -EINVAL; |
| } |
| |
| mngr = c->mngr; |
| mutex_lock(&mngr->clk_mutex); |
| |
| pr_debug("[%s]%s: CLK=%d, new_state=%d, core=%d, linkl=%d\n", |
| mngr->name, c->name, clk, state, c->core_clk_state, |
| c->link_clk_state); |
| |
| /* |
| * Clock refcount handling as below: |
| * i. Increment refcount whenever ON is called. |
| * ii. Decrement refcount when transitioning from ON state to |
| * either OFF or EARLY_GATE. |
| * iii. Do not decrement refcount when changing from |
| * EARLY_GATE to OFF. |
| */ |
| if (state == DSI_CLK_ON) { |
| if (clk & DSI_CORE_CLK) { |
| c->core_refcount++; |
| if (c->core_clk_state != DSI_CLK_ON) { |
| c->core_clk_state = DSI_CLK_ON; |
| changed = true; |
| } |
| } |
| if (clk & DSI_LINK_CLK) { |
| c->link_refcount++; |
| if (c->link_clk_state != DSI_CLK_ON) { |
| c->link_clk_state = DSI_CLK_ON; |
| changed = true; |
| } |
| } |
| } else if ((state == DSI_CLK_EARLY_GATE) || |
| (state == DSI_CLK_OFF)) { |
| if (clk & DSI_CORE_CLK) { |
| if (c->core_refcount == 0) { |
| if ((c->core_clk_state == |
| DSI_CLK_EARLY_GATE) && |
| (state == DSI_CLK_OFF)) { |
| changed = true; |
| c->core_clk_state = DSI_CLK_OFF; |
| } else { |
| pr_warn("Core refcount is zero for %s", |
| c->name); |
| } |
| } else { |
| c->core_refcount--; |
| if (c->core_refcount == 0) { |
| c->core_clk_state = state; |
| changed = true; |
| } |
| } |
| } |
| if (clk & DSI_LINK_CLK) { |
| if (c->link_refcount == 0) { |
| if ((c->link_clk_state == |
| DSI_CLK_EARLY_GATE) && |
| (state == DSI_CLK_OFF)) { |
| changed = true; |
| c->link_clk_state = DSI_CLK_OFF; |
| } else { |
| pr_warn("Link refcount is zero for %s", |
| c->name); |
| } |
| } else { |
| c->link_refcount--; |
| if (c->link_refcount == 0) { |
| c->link_clk_state = state; |
| changed = true; |
| } |
| } |
| } |
| } |
| pr_debug("[%s]%s: change=%d, Core (ref=%d, state=%d), Link (ref=%d, state=%d)\n", |
| mngr->name, c->name, changed, c->core_refcount, |
| c->core_clk_state, c->link_refcount, c->link_clk_state); |
| |
| if (changed) { |
| rc = dsi_recheck_clk_state(mngr); |
| if (rc) |
| pr_err("Failed to adjust clock state rc = %d\n", rc); |
| } |
| |
| mutex_unlock(&mngr->clk_mutex); |
| return rc; |
| } |
| |
| DEFINE_MUTEX(dsi_mngr_clk_mutex); |
| |
| int dsi_display_clk_ctrl(void *handle, |
| enum dsi_clk_type clk_type, enum dsi_clk_state clk_state) |
| { |
| int rc = 0; |
| |
| if (!handle) { |
| pr_err("%s: Invalid arg\n", __func__); |
| return -EINVAL; |
| } |
| |
| mutex_lock(&dsi_mngr_clk_mutex); |
| rc = dsi_clk_req_state(handle, clk_type, clk_state); |
| if (rc) |
| pr_err("%s: failed set clk state, rc = %d\n", __func__, rc); |
| mutex_unlock(&dsi_mngr_clk_mutex); |
| |
| return rc; |
| } |
| |
| void *dsi_register_clk_handle(void *clk_mngr, char *client) |
| { |
| void *handle = NULL; |
| struct dsi_clk_mngr *mngr = clk_mngr; |
| struct dsi_clk_client_info *c; |
| |
| if (!mngr) { |
| pr_err("bad params\n"); |
| return ERR_PTR(-EINVAL); |
| } |
| |
| mutex_lock(&mngr->clk_mutex); |
| |
| c = kzalloc(sizeof(*c), GFP_KERNEL); |
| if (!c) { |
| handle = ERR_PTR(-ENOMEM); |
| goto error; |
| } |
| |
| strlcpy(c->name, client, MAX_STRING_LEN); |
| c->mngr = mngr; |
| |
| list_add(&c->list, &mngr->client_list); |
| |
| pr_debug("[%s]: Added new client (%s)\n", mngr->name, c->name); |
| handle = c; |
| error: |
| mutex_unlock(&mngr->clk_mutex); |
| return handle; |
| } |
| |
| int dsi_deregister_clk_handle(void *client) |
| { |
| int rc = 0; |
| struct dsi_clk_client_info *c = client; |
| struct dsi_clk_mngr *mngr; |
| struct list_head *pos = NULL; |
| struct list_head *tmp = NULL; |
| struct dsi_clk_client_info *node = NULL; |
| |
| if (!client) { |
| pr_err("Invalid params\n"); |
| return -EINVAL; |
| } |
| |
| mngr = c->mngr; |
| pr_debug("%s: ENTER\n", mngr->name); |
| mutex_lock(&mngr->clk_mutex); |
| c->core_clk_state = DSI_CLK_OFF; |
| c->link_clk_state = DSI_CLK_OFF; |
| |
| rc = dsi_recheck_clk_state(mngr); |
| if (rc) { |
| pr_err("clock state recheck failed rc = %d\n", rc); |
| goto error; |
| } |
| |
| list_for_each_safe(pos, tmp, &mngr->client_list) { |
| node = list_entry(pos, struct dsi_clk_client_info, |
| list); |
| if (node == c) { |
| list_del(&node->list); |
| pr_debug("Removed device (%s)\n", node->name); |
| kfree(node); |
| break; |
| } |
| } |
| |
| error: |
| mutex_unlock(&mngr->clk_mutex); |
| pr_debug("%s: EXIT, rc = %d\n", mngr->name, rc); |
| return rc; |
| } |
| |
| void *dsi_display_clk_mngr_register(struct dsi_clk_info *info) |
| { |
| struct dsi_clk_mngr *mngr; |
| int i = 0; |
| |
| if (!info) { |
| pr_err("Invalid params\n"); |
| return ERR_PTR(-EINVAL); |
| } |
| |
| mngr = kzalloc(sizeof(*mngr), GFP_KERNEL); |
| if (!mngr) { |
| mngr = ERR_PTR(-ENOMEM); |
| goto error; |
| } |
| |
| mutex_init(&mngr->clk_mutex); |
| mngr->dsi_ctrl_count = info->dsi_ctrl_count; |
| mngr->master_ndx = info->master_ndx; |
| |
| if (mngr->dsi_ctrl_count > MAX_DSI_CTRL) { |
| kfree(mngr); |
| return ERR_PTR(-EINVAL); |
| } |
| |
| for (i = 0; i < mngr->dsi_ctrl_count; i++) { |
| memcpy(&mngr->core_clks[i].clks, &info->c_clks[i], |
| sizeof(struct dsi_core_clk_info)); |
| memcpy(&mngr->link_clks[i].clks, &info->l_clks[i], |
| sizeof(struct dsi_link_clk_info)); |
| mngr->core_clks[i].bus_handle = info->bus_handle[i]; |
| mngr->ctrl_index[i] = info->ctrl_index[i]; |
| } |
| |
| INIT_LIST_HEAD(&mngr->client_list); |
| mngr->pre_clkon_cb = info->pre_clkon_cb; |
| mngr->post_clkon_cb = info->post_clkon_cb; |
| mngr->pre_clkoff_cb = info->pre_clkoff_cb; |
| mngr->post_clkoff_cb = info->post_clkoff_cb; |
| mngr->priv_data = info->priv_data; |
| memcpy(mngr->name, info->name, MAX_STRING_LEN); |
| |
| error: |
| pr_debug("EXIT, rc = %ld\n", PTR_ERR(mngr)); |
| return mngr; |
| } |
| |
| int dsi_display_clk_mngr_deregister(void *clk_mngr) |
| { |
| int rc = 0; |
| struct dsi_clk_mngr *mngr = clk_mngr; |
| struct list_head *position = NULL; |
| struct list_head *tmp = NULL; |
| struct dsi_clk_client_info *node = NULL; |
| |
| if (!mngr) { |
| pr_err("Invalid params\n"); |
| return -EINVAL; |
| } |
| |
| pr_debug("%s: ENTER\n", mngr->name); |
| mutex_lock(&mngr->clk_mutex); |
| |
| list_for_each_safe(position, tmp, &mngr->client_list) { |
| node = list_entry(position, struct dsi_clk_client_info, |
| list); |
| list_del(&node->list); |
| pr_debug("Removed device (%s)\n", node->name); |
| kfree(node); |
| } |
| |
| rc = dsi_recheck_clk_state(mngr); |
| if (rc) |
| pr_err("failed to disable all clocks\n"); |
| |
| mutex_unlock(&mngr->clk_mutex); |
| pr_debug("%s: EXIT, rc = %d\n", mngr->name, rc); |
| kfree(mngr); |
| return rc; |
| } |
| |