Add clock gating control as a part of the tmio library functions for
runtime PM.
Signed-off-by: Ulf Hansson <ulf.hans...@linaro.org>
---
drivers/mmc/host/tmio_mmc.h | 3 ++-
drivers/mmc/host/tmio_mmc_pio.c | 28 ++++++++++++++++++++++++----
2 files changed, 26 insertions(+), 5 deletions(-)
diff --git a/drivers/mmc/host/tmio_mmc.h b/drivers/mmc/host/tmio_mmc.h
index f837723..f1ee3e4 100644
--- a/drivers/mmc/host/tmio_mmc.h
+++ b/drivers/mmc/host/tmio_mmc.h
@@ -73,9 +73,10 @@ struct tmio_mmc_host {
struct delayed_work delayed_reset_work;
struct work_struct done;
- /* Cache IRQ mask */
+ /* Cache */
u32 sdcard_irq_mask;
u32 sdio_irq_mask;
+ unsigned int clk_cache;
spinlock_t lock; /* protect host private data */
unsigned long last_req_ts;
diff --git a/drivers/mmc/host/tmio_mmc_pio.c b/drivers/mmc/host/tmio_mmc_pio.c
index e573a15..2345177 100644
--- a/drivers/mmc/host/tmio_mmc_pio.c
+++ b/drivers/mmc/host/tmio_mmc_pio.c
@@ -149,7 +149,8 @@ static void tmio_mmc_enable_sdio_irq(struct mmc_host *mmc,
int enable)
}
}
-static void tmio_mmc_set_clock(struct tmio_mmc_host *host, int new_clock)
+static void tmio_mmc_set_clock(struct tmio_mmc_host *host,
+ unsigned int new_clock)
{
u32 clk = 0, clock;
@@ -767,9 +768,9 @@ fail:
pm_runtime_put_autosuspend(mmc_dev(mmc));
}
-static int tmio_mmc_clk_update(struct mmc_host *mmc)
+static int tmio_mmc_clk_update(struct tmio_mmc_host *host)
{
- struct tmio_mmc_host *host = mmc_priv(mmc);
+ struct mmc_host *mmc = host->mmc;
struct tmio_mmc_data *pdata = host->pdata;
int ret;
@@ -911,6 +912,8 @@ static void tmio_mmc_set_ios(struct mmc_host *mmc, struct
mmc_ios *ios)
ios->clock, ios->power_mode);
host->mrq = NULL;
+ host->clk_cache = ios->clock;
+
mutex_unlock(&host->ios_lock);
pm_runtime_mark_last_busy(mmc_dev(mmc));
@@ -1036,7 +1039,7 @@ int tmio_mmc_host_probe(struct tmio_mmc_host **host,
mmc->caps & MMC_CAP_NONREMOVABLE ||
mmc->slot.cd_irq >= 0);
- if (tmio_mmc_clk_update(mmc) < 0) {
+ if (tmio_mmc_clk_update(_host) < 0) {
mmc->f_max = pdata->hclk;
mmc->f_min = mmc->f_max / 512;
}
@@ -1162,6 +1165,15 @@ EXPORT_SYMBOL(tmio_mmc_host_resume);
#ifdef CONFIG_PM_RUNTIME
int tmio_mmc_host_runtime_suspend(struct device *dev)
{
+ struct mmc_host *mmc = dev_get_drvdata(dev);
+ struct tmio_mmc_host *host = mmc_priv(mmc);
+
+ if (host->clk_cache)
+ tmio_mmc_clk_stop(host);
+
+ if (host->pdata->clk_disable)
+ host->pdata->clk_disable(host->pdev);
+
return 0;
}
EXPORT_SYMBOL(tmio_mmc_host_runtime_suspend);
@@ -1171,6 +1183,14 @@ int tmio_mmc_host_runtime_resume(struct device *dev)
struct mmc_host *mmc = dev_get_drvdata(dev);
struct tmio_mmc_host *host = mmc_priv(mmc);
+ tmio_mmc_reset(host);
+ tmio_mmc_clk_update(host);
+
+ if (host->clk_cache) {
+ tmio_mmc_set_clock(host, host->clk_cache);
+ tmio_mmc_clk_start(host);
+ }
+
tmio_mmc_enable_dma(host, true);
return 0;
--
1.9.1
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majord...@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
