drivers/media/platform/msm/sde/rotator/sde_rotator_base.c

/* Copyright (c) 2012, 2015-2016, 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.
 *
 */
#define pr_fmt(fmt)	"%s: " fmt, __func__

#include <linux/errno.h>
#include <linux/file.h>
#include <linux/spinlock.h>
#include <linux/types.h>
#include <linux/major.h>
#include <linux/debugfs.h>
#include <linux/clk.h>
#include <linux/slab.h>
#include <linux/io.h>
#include <linux/iopoll.h>
#include <linux/msm-bus.h>
#include <linux/msm-bus-board.h>
#include <linux/regulator/consumer.h>

#define CREATE_TRACE_POINTS
#include "sde_rotator_base.h"
#include "sde_rotator_util.h"
#include "sde_rotator_trace.h"

static inline u64 fudge_factor(u64 val, u32 numer, u32 denom)
{
	u64 result = (val * (u64)numer);

	do_div(result, denom);
	return result;
}

static inline u64 apply_fudge_factor(u64 val,
	struct sde_mult_factor *factor)
{
	return fudge_factor(val, factor->numer, factor->denom);
}

static inline u64 apply_inverse_fudge_factor(u64 val,
	struct sde_mult_factor *factor)
{
	return fudge_factor(val, factor->denom, factor->numer);
}

static inline bool validate_comp_ratio(struct sde_mult_factor *factor)
{
	return factor->numer && factor->denom;
}

u32 sde_apply_comp_ratio_factor(u32 quota,
	struct sde_mdp_format_params *fmt,
	struct sde_mult_factor *factor)
{
	struct sde_rot_data_type *mdata = sde_rot_get_mdata();

	if (!mdata || !test_bit(SDE_QOS_OVERHEAD_FACTOR,
		      mdata->sde_qos_map))
		return quota;

	/* apply compression ratio, only for compressed formats */
	if (sde_mdp_is_ubwc_format(fmt) &&
	    validate_comp_ratio(factor))
		quota = apply_inverse_fudge_factor(quota, factor);

	return quota;
}

#define RES_1080p		(1088*1920)
#define RES_UHD		(3840*2160)
#define XIN_HALT_TIMEOUT_US	0x4000

static int sde_mdp_wait_for_xin_halt(u32 xin_id)
{
	void __iomem *vbif_base;
	u32 status;
	struct sde_rot_data_type *mdata = sde_rot_get_mdata();
	u32 idle_mask = BIT(xin_id);
	int rc;

	vbif_base = mdata->vbif_nrt_io.base;

	rc = readl_poll_timeout(vbif_base + MMSS_VBIF_XIN_HALT_CTRL1,
		status, (status & idle_mask),
		1000, XIN_HALT_TIMEOUT_US);
	if (rc == -ETIMEDOUT) {
		SDEROT_ERR("VBIF client %d not halting. TIMEDOUT.\n",
			xin_id);
	} else {
		SDEROT_DBG("VBIF client %d is halted\n", xin_id);
	}

	return rc;
}

/**
 * force_on_xin_clk() - enable/disable the force-on for the pipe clock
 * @bit_off: offset of the bit to enable/disable the force-on.
 * @reg_off: register offset for the clock control.
 * @enable: boolean to indicate if the force-on of the clock needs to be
 * enabled or disabled.
 *
 * This function returns:
 * true - if the clock is forced-on by this function
 * false - if the clock was already forced on
 * It is the caller responsibility to check if this function is forcing
 * the clock on; if so, it will need to remove the force of the clock,
 * otherwise it should avoid to remove the force-on.
 * Clocks must be on when calling this function.
 */
static bool force_on_xin_clk(u32 bit_off, u32 clk_ctl_reg_off, bool enable)
{
	u32 val;
	u32 force_on_mask;
	struct sde_rot_data_type *mdata = sde_rot_get_mdata();
	bool clk_forced_on = false;

	force_on_mask = BIT(bit_off);
	val = readl_relaxed(mdata->mdp_base + clk_ctl_reg_off);

	clk_forced_on = !(force_on_mask & val);

	if (true == enable)
		val |= force_on_mask;
	else
		val &= ~force_on_mask;

	writel_relaxed(val, mdata->mdp_base + clk_ctl_reg_off);

	return clk_forced_on;
}

static void apply_dynamic_ot_limit(u32 *ot_lim,
	struct sde_mdp_set_ot_params *params)
{
	struct sde_rot_data_type *mdata = sde_rot_get_mdata();
	u32 res;

	if (false == test_bit(SDE_QOS_OTLIM, mdata->sde_qos_map))
		return;

	res = params->width * params->height;

	SDEROT_DBG("w:%d h:%d rot:%d yuv:%d wb:%d res:%d\n",
		params->width, params->height, params->is_rot,
		params->is_yuv, params->is_wb, res);

	if ((params->is_rot && params->is_yuv) ||
		params->is_wb) {
		if (res <= RES_1080p) {
			*ot_lim = 2;
		} else if (res <= RES_UHD) {
			if (params->is_rot && params->is_yuv)
				*ot_lim = 8;
			else
				*ot_lim = 16;
		}
	}
}

static u32 get_ot_limit(u32 reg_off, u32 bit_off,
	struct sde_mdp_set_ot_params *params)
{
	struct sde_rot_data_type *mdata = sde_rot_get_mdata();
	u32 ot_lim = 0;
	u32 val;

	if (mdata->default_ot_wr_limit &&
		(params->reg_off_vbif_lim_conf == MMSS_VBIF_WR_LIM_CONF))
		ot_lim = mdata->default_ot_wr_limit;
	else if (mdata->default_ot_rd_limit &&
		(params->reg_off_vbif_lim_conf == MMSS_VBIF_RD_LIM_CONF))
		ot_lim = mdata->default_ot_rd_limit;

	/*
	 * If default ot is not set from dt,
	 * then do not configure it.
	 */
	if (ot_lim == 0)
		goto exit;

	/* Modify the limits if the target and the use case requires it */
	apply_dynamic_ot_limit(&ot_lim, params);

	val = SDE_VBIF_READ(mdata, reg_off);
	val &= (0xFF << bit_off);
	val = val >> bit_off;

	if (val == ot_lim)
		ot_lim = 0;

exit:
	SDEROT_DBG("ot_lim=%d\n", ot_lim);
	return ot_lim;
}

void sde_mdp_set_ot_limit(struct sde_mdp_set_ot_params *params)
{
	struct sde_rot_data_type *mdata = sde_rot_get_mdata();
	u32 ot_lim;
	u32 reg_off_vbif_lim_conf = (params->xin_id / 4) * 4 +
		params->reg_off_vbif_lim_conf;
	u32 bit_off_vbif_lim_conf = (params->xin_id % 4) * 8;
	u32 reg_val;
	bool forced_on;

	ot_lim = get_ot_limit(
		reg_off_vbif_lim_conf,
		bit_off_vbif_lim_conf,
		params) & 0xFF;

	if (ot_lim == 0)
		goto exit;

	trace_rot_perf_set_ot(params->num, params->xin_id, ot_lim);

	forced_on = force_on_xin_clk(params->bit_off_mdp_clk_ctrl,
		params->reg_off_mdp_clk_ctrl, true);

	reg_val = SDE_VBIF_READ(mdata, reg_off_vbif_lim_conf);
	reg_val &= ~(0xFF << bit_off_vbif_lim_conf);
	reg_val |= (ot_lim) << bit_off_vbif_lim_conf;
	SDE_VBIF_WRITE(mdata, reg_off_vbif_lim_conf, reg_val);

	reg_val = SDE_VBIF_READ(mdata, MMSS_VBIF_XIN_HALT_CTRL0);
	SDE_VBIF_WRITE(mdata, MMSS_VBIF_XIN_HALT_CTRL0,
		reg_val | BIT(params->xin_id));

	/* this is a polling operation */
	sde_mdp_wait_for_xin_halt(params->xin_id);

	reg_val = SDE_VBIF_READ(mdata, MMSS_VBIF_XIN_HALT_CTRL0);
	SDE_VBIF_WRITE(mdata, MMSS_VBIF_XIN_HALT_CTRL0,
		reg_val & ~BIT(params->xin_id));

	if (forced_on)
		force_on_xin_clk(params->bit_off_mdp_clk_ctrl,
			params->reg_off_mdp_clk_ctrl, false);

exit:
	return;
}

struct reg_bus_client *sde_reg_bus_vote_client_create(char *client_name)
{
	struct reg_bus_client *client;
	struct sde_rot_data_type *sde_res = sde_rot_get_mdata();
	static u32 id;

	if (client_name == NULL) {
		SDEROT_ERR("client name is null\n");
		return ERR_PTR(-EINVAL);
	}

	client = kzalloc(sizeof(struct reg_bus_client), GFP_KERNEL);
	if (!client)
		return ERR_PTR(-ENOMEM);

	mutex_lock(&sde_res->reg_bus_lock);
	strlcpy(client->name, client_name, MAX_CLIENT_NAME_LEN);
	client->usecase_ndx = VOTE_INDEX_DISABLE;
	client->id = id;
	SDEROT_DBG("bus vote client %s created:%p id :%d\n", client_name,
		client, id);
	id++;
	list_add(&client->list, &sde_res->reg_bus_clist);
	mutex_unlock(&sde_res->reg_bus_lock);

	return client;
}

void sde_reg_bus_vote_client_destroy(struct reg_bus_client *client)
{
	struct sde_rot_data_type *sde_res = sde_rot_get_mdata();

	if (!client) {
		SDEROT_ERR("reg bus vote: invalid client handle\n");
	} else {
		SDEROT_DBG("bus vote client %s destroyed:%p id:%u\n",
			client->name, client, client->id);
		mutex_lock(&sde_res->reg_bus_lock);
		list_del_init(&client->list);
		mutex_unlock(&sde_res->reg_bus_lock);
		kfree(client);
	}
}

int sde_update_reg_bus_vote(struct reg_bus_client *bus_client, u32 usecase_ndx)
{
	int ret = 0;
	bool changed = false;
	u32 max_usecase_ndx = VOTE_INDEX_DISABLE;
	struct reg_bus_client *client, *temp_client;
	struct sde_rot_data_type *sde_res = sde_rot_get_mdata();

	if (!sde_res || !sde_res->reg_bus_hdl || !bus_client)
		return 0;

	mutex_lock(&sde_res->reg_bus_lock);
	bus_client->usecase_ndx = usecase_ndx;
	list_for_each_entry_safe(client, temp_client, &sde_res->reg_bus_clist,
		list) {

		if (client->usecase_ndx < VOTE_INDEX_MAX &&
		    client->usecase_ndx > max_usecase_ndx)
			max_usecase_ndx = client->usecase_ndx;
	}

	if (sde_res->reg_bus_usecase_ndx != max_usecase_ndx) {
		changed = true;
		sde_res->reg_bus_usecase_ndx = max_usecase_ndx;
	}

	SDEROT_DBG(
		"%pS: changed=%d current idx=%d request client %s id:%u idx:%d\n",
		__builtin_return_address(0), changed, max_usecase_ndx,
		bus_client->name, bus_client->id, usecase_ndx);
	if (changed)
		ret = msm_bus_scale_client_update_request(sde_res->reg_bus_hdl,
			max_usecase_ndx);

	mutex_unlock(&sde_res->reg_bus_lock);
	return ret;
}

static int sde_mdp_parse_dt_handler(struct platform_device *pdev,
		char *prop_name, u32 *offsets, int len)
{
	int rc;

	rc = of_property_read_u32_array(pdev->dev.of_node, prop_name,
					offsets, len);
	if (rc) {
		SDEROT_ERR("Error from prop %s : u32 array read\n", prop_name);
		return -EINVAL;
	}

	return 0;
}

static int sde_mdp_parse_dt_prop_len(struct platform_device *pdev,
				      char *prop_name)
{
	int len = 0;

	of_find_property(pdev->dev.of_node, prop_name, &len);

	if (len < 1) {
		SDEROT_INFO("prop %s : doesn't exist in device tree\n",
			prop_name);
		return 0;
	}

	len = len/sizeof(u32);

	return len;
}

static void sde_mdp_parse_vbif_qos(struct platform_device *pdev,
		struct sde_rot_data_type *mdata)
{
	int rc;

	mdata->vbif_rt_qos = NULL;

	mdata->npriority_lvl = sde_mdp_parse_dt_prop_len(pdev,
			"qcom,mdss-rot-vbif-qos-setting");
	mdata->vbif_nrt_qos = kzalloc(sizeof(u32) *
			mdata->npriority_lvl, GFP_KERNEL);
	if (!mdata->vbif_nrt_qos)
		return;

	rc = sde_mdp_parse_dt_handler(pdev,
		"qcom,mdss-rot-vbif-qos-setting", mdata->vbif_nrt_qos,
			mdata->npriority_lvl);
	if (rc) {
		SDEROT_DBG("vbif setting not found\n");
		return;
	}
}

static int sde_mdp_parse_dt_misc(struct platform_device *pdev,
		struct sde_rot_data_type *mdata)
{
	int rc;
	u32 data;

	rc = of_property_read_u32(pdev->dev.of_node, "qcom,mdss-rot-block-size",
		&data);
	mdata->rot_block_size = (!rc ? data : 128);

	rc = of_property_read_u32(pdev->dev.of_node,
		"qcom,mdss-default-ot-rd-limit", &data);
	mdata->default_ot_rd_limit = (!rc ? data : 0);

	rc = of_property_read_u32(pdev->dev.of_node,
		"qcom,mdss-default-ot-wr-limit", &data);
	mdata->default_ot_wr_limit = (!rc ? data : 0);

	rc = of_property_read_u32(pdev->dev.of_node,
		 "qcom,mdss-highest-bank-bit", &(mdata->highest_bank_bit));
	if (rc)
		SDEROT_DBG(
			"Could not read optional property: highest bank bit\n");

	sde_mdp_parse_vbif_qos(pdev, mdata);

	mdata->mdp_base = mdata->sde_io.base + SDE_MDP_OFFSET;

	return 0;
}

#define MDP_REG_BUS_VECTOR_ENTRY(ab_val, ib_val)	\
	{						\
		.src = MSM_BUS_MASTER_AMPSS_M0,		\
		.dst = MSM_BUS_SLAVE_DISPLAY_CFG,	\
		.ab = (ab_val),				\
		.ib = (ib_val),				\
	}

#define BUS_VOTE_19_MHZ 153600000
#define BUS_VOTE_40_MHZ 320000000
#define BUS_VOTE_80_MHZ 640000000

static struct msm_bus_vectors mdp_reg_bus_vectors[] = {
	MDP_REG_BUS_VECTOR_ENTRY(0, 0),
	MDP_REG_BUS_VECTOR_ENTRY(0, BUS_VOTE_19_MHZ),
	MDP_REG_BUS_VECTOR_ENTRY(0, BUS_VOTE_40_MHZ),
	MDP_REG_BUS_VECTOR_ENTRY(0, BUS_VOTE_80_MHZ),
};
static struct msm_bus_paths mdp_reg_bus_usecases[ARRAY_SIZE(
		mdp_reg_bus_vectors)];
static struct msm_bus_scale_pdata mdp_reg_bus_scale_table = {
	.usecase = mdp_reg_bus_usecases,
	.num_usecases = ARRAY_SIZE(mdp_reg_bus_usecases),
	.name = "sde_reg",
	.active_only = true,
};

static int sde_mdp_bus_scale_register(struct sde_rot_data_type *mdata)
{
	struct msm_bus_scale_pdata *reg_bus_pdata;
	int i;

	if (!mdata->reg_bus_hdl) {
		reg_bus_pdata = &mdp_reg_bus_scale_table;
		for (i = 0; i < reg_bus_pdata->num_usecases; i++) {
			mdp_reg_bus_usecases[i].num_paths = 1;
			mdp_reg_bus_usecases[i].vectors =
				&mdp_reg_bus_vectors[i];
		}

		mdata->reg_bus_hdl =
			msm_bus_scale_register_client(reg_bus_pdata);
		if (!mdata->reg_bus_hdl) {
			/* Continue without reg_bus scaling */
			SDEROT_WARN("reg_bus_client register failed\n");
		} else
			SDEROT_DBG("register reg_bus_hdl=%x\n",
					mdata->reg_bus_hdl);
	}

	return 0;
}

static void sde_mdp_bus_scale_unregister(struct sde_rot_data_type *mdata)
{
	SDEROT_DBG("unregister reg_bus_hdl=%x\n", mdata->reg_bus_hdl);

	if (mdata->reg_bus_hdl) {
		msm_bus_scale_unregister_client(mdata->reg_bus_hdl);
		mdata->reg_bus_hdl = 0;
	}
}

static struct sde_rot_data_type *sde_rot_res;

struct sde_rot_data_type *sde_rot_get_mdata(void)
{
	return sde_rot_res;
}

/*
 * sde_rotator_base_init - initialize base rotator data/resource
 */
int sde_rotator_base_init(struct sde_rot_data_type **pmdata,
		struct platform_device *pdev,
		const void *drvdata)
{
	int rc;
	struct sde_rot_data_type *mdata;

	mdata = devm_kzalloc(&pdev->dev, sizeof(*mdata), GFP_KERNEL);
	if (mdata == NULL)
		return -ENOMEM;

	mdata->pdev = pdev;
	sde_rot_res = mdata;
	mutex_init(&mdata->reg_bus_lock);
	INIT_LIST_HEAD(&mdata->reg_bus_clist);

	rc = sde_rot_ioremap_byname(pdev, &mdata->sde_io, "mdp_phys");
	if (rc) {
		SDEROT_ERR("unable to map SDE base\n");
		goto probe_done;
	}
	SDEROT_DBG("SDE ROT HW Base addr=0x%x len=0x%x\n",
		(int) (unsigned long) mdata->sde_io.base,
		mdata->sde_io.len);

	rc = sde_rot_ioremap_byname(pdev, &mdata->vbif_nrt_io, "rot_vbif_phys");
	if (rc) {
		SDEROT_ERR("unable to map SDE ROT VBIF base\n");
		goto probe_done;
	}
	SDEROT_DBG("SDE ROT VBIF HW Base addr=%p len=0x%x\n",
			mdata->vbif_nrt_io.base, mdata->vbif_nrt_io.len);

	rc = sde_mdp_parse_dt_misc(pdev, mdata);
	if (rc) {
		SDEROT_ERR("Error in device tree : misc\n");
		goto probe_done;
	}

	rc = sde_mdp_bus_scale_register(mdata);
	if (rc) {
		SDEROT_ERR("unable to register bus scaling\n");
		goto probe_done;
	}

	rc = sde_smmu_init(&pdev->dev);
	if (rc) {
		SDEROT_ERR("sde smmu init failed %d\n", rc);
		goto probe_done;
	}

	*pmdata = mdata;

	return 0;
probe_done:
	return rc;
}

/*
 * sde_rotator_base_destroy - clean up base rotator data/resource
 */
void sde_rotator_base_destroy(struct sde_rot_data_type *mdata)
{
	struct platform_device *pdev;

	if (!mdata || !mdata->pdev)
		return;

	pdev = mdata->pdev;

	sde_rot_res = NULL;
	sde_mdp_bus_scale_unregister(mdata);
	sde_rot_iounmap(&mdata->vbif_nrt_io);
	sde_rot_iounmap(&mdata->sde_io);
	devm_kfree(&pdev->dev, mdata);
}