Merge "mmc: msm_sdcc: Add support for dynamic bus clock vote"
diff --git a/drivers/mmc/host/msm_sdcc.c b/drivers/mmc/host/msm_sdcc.c
index 8e4bae1..caf5fe4 100644
--- a/drivers/mmc/host/msm_sdcc.c
+++ b/drivers/mmc/host/msm_sdcc.c
@@ -4393,6 +4393,39 @@
return data_cnt;
}
+static int msmsdcc_notify_load(struct mmc_host *mmc, enum mmc_load state)
+{
+ int err = 0;
+ unsigned long rate;
+ struct msmsdcc_host *host = mmc_priv(mmc);
+
+ if (IS_ERR_OR_NULL(host->bus_clk))
+ goto out;
+
+ switch (state) {
+ case MMC_LOAD_HIGH:
+ rate = MSMSDCC_BUS_VOTE_MAX_RATE;
+ break;
+ case MMC_LOAD_LOW:
+ rate = MSMSDCC_BUS_VOTE_MIN_RATE;
+ break;
+ default:
+ err = -EINVAL;
+ goto out;
+ }
+
+ if (rate != host->bus_clk_rate) {
+ err = clk_set_rate(host->bus_clk, rate);
+ if (err)
+ pr_err("%s: %s: bus clk set rate %lu Hz err %d\n",
+ mmc_hostname(mmc), __func__, rate, err);
+ else
+ host->bus_clk_rate = rate;
+ }
+out:
+ return err;
+}
+
static const struct mmc_host_ops msmsdcc_ops = {
.enable = msmsdcc_enable,
.disable = msmsdcc_disable,
@@ -4407,6 +4440,7 @@
.hw_reset = msmsdcc_hw_reset,
.stop_request = msmsdcc_stop_request,
.get_xfer_remain = msmsdcc_get_xfer_remain,
+ .notify_load = msmsdcc_notify_load,
};
static void msmsdcc_enable_status_gpio(struct msmsdcc_host *host)
@@ -5975,12 +6009,13 @@
host->bus_clk = clk_get(&pdev->dev, "bus_clk");
if (!IS_ERR_OR_NULL(host->bus_clk)) {
/* Vote for max. clk rate for max. performance */
- ret = clk_set_rate(host->bus_clk, INT_MAX);
+ ret = clk_set_rate(host->bus_clk, MSMSDCC_BUS_VOTE_MAX_RATE);
if (ret)
goto bus_clk_put;
ret = clk_prepare_enable(host->bus_clk);
if (ret)
goto bus_clk_put;
+ host->bus_clk_rate = MSMSDCC_BUS_VOTE_MAX_RATE;
}
/*
diff --git a/drivers/mmc/host/msm_sdcc.h b/drivers/mmc/host/msm_sdcc.h
index 4ed2d96..bcfde57 100644
--- a/drivers/mmc/host/msm_sdcc.h
+++ b/drivers/mmc/host/msm_sdcc.h
@@ -260,6 +260,12 @@
#define MMC_MAX_DMA_CMDS (MAX_NR_SG_DMA_PIO * (MMC_MAX_REQ_SIZE / \
MMC_MAX_DMA_BOX_LENGTH))
+/*
+ * Peripheral bus clock scaling vote rates
+ */
+#define MSMSDCC_BUS_VOTE_MAX_RATE 64000000 /* Hz */
+#define MSMSDCC_BUS_VOTE_MIN_RATE 32000000 /* Hz */
+
struct clk;
struct msmsdcc_nc_dmadata {
@@ -360,6 +366,7 @@
struct clk *clk; /* main MMC bus clock */
struct clk *pclk; /* SDCC peripheral bus clock */
struct clk *bus_clk; /* SDCC bus voter clock */
+ unsigned long bus_clk_rate; /* peripheral bus clk rate */
atomic_t clks_on; /* set if clocks are enabled */
unsigned int eject; /* eject state */