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MLK-11685-5 mmc: sdhci-esdhc-imx: no need busfreq for imx6qdl

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The usdhc of i.MX6Q/DL can work well under low power mode without
request high bus freq. So we do not need request bus freq for i.MX6Q/DL.
It can save power for i.MX6D/DL due to it saves a lot busfreq switch
cost as well as the CPU time runing on high bus freq after switch
during low power mode.

A new flag ESDHC_FLAG_BUSFREQ is added to indicated this requirement.
Currently only i.MX6SL is using it.

Signed-off-by: Dong Aisheng <b29396@freescale.com>
(cherry picked from commit 3b954ce55b56dfce195d65b84913ff3c0fcb9f82)
Signed-off-by: Haibo Chen <haibo.chen@freescale.com>

Conflicts:
	drivers/mmc/host/sdhci-esdhc-imx.c
This commit is contained in:
Dong Aisheng
2014-01-17 10:23:22 +08:00
committed by Nitin Garg
parent cb5c4a5f85
commit 312979d1fc
1 changed files with 11 additions and 5 deletions
Download Patch File Download Diff File Expand all files Collapse all files

16
drivers/mmc/host/sdhci-esdhc-imx.c
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@ -137,6 +137,8 @@
#define ESDHC_FLAG_HS200 BIT(8)
/* The IP supports HS400 mode */
#define ESDHC_FLAG_HS400 BIT(9)
/* need request bus freq during low power */
#define ESDHC_FLAG_BUSFREQ BIT(10)
/* A higher clock ferquency than this rate requires strobell dll control */
#define ESDHC_STROBE_DLL_CLK_FREQ 100000000
@ -176,7 +178,7 @@ static struct esdhc_soc_data usdhc_imx6q_data = {
static struct esdhc_soc_data usdhc_imx6sl_data = {
.flags = ESDHC_FLAG_USDHC | ESDHC_FLAG_STD_TUNING
| ESDHC_FLAG_HAVE_CAP1 | ESDHC_FLAG_ERR004536
| ESDHC_FLAG_HS200,
| ESDHC_FLAG_HS200 | ESDHC_FLAG_BUSFREQ,
};
static struct esdhc_soc_data usdhc_imx6sx_data = {
@ -1158,7 +1160,8 @@ static int sdhci_esdhc_imx_probe(struct platform_device *pdev)
pltfm_host->clk = imx_data->clk_per;
pltfm_host->clock = clk_get_rate(pltfm_host->clk);
request_bus_freq(BUS_FREQ_HIGH);
if (imx_data->socdata->flags & ESDHC_FLAG_BUSFREQ)
request_bus_freq(BUS_FREQ_HIGH);
clk_prepare_enable(imx_data->clk_per);
clk_prepare_enable(imx_data->clk_ipg);
@ -1245,7 +1248,8 @@ disable_clk:
clk_disable_unprepare(imx_data->clk_per);
clk_disable_unprepare(imx_data->clk_ipg);
clk_disable_unprepare(imx_data->clk_ahb);
release_bus_freq(BUS_FREQ_HIGH);
if (imx_data->socdata->flags & ESDHC_FLAG_BUSFREQ)
release_bus_freq(BUS_FREQ_HIGH);
free_sdhci:
sdhci_pltfm_free(pdev);
return err;
@ -1289,7 +1293,8 @@ static int sdhci_esdhc_runtime_suspend(struct device *dev)
}
clk_disable_unprepare(imx_data->clk_ahb);
release_bus_freq(BUS_FREQ_HIGH);
if (imx_data->socdata->flags & ESDHC_FLAG_BUSFREQ)
release_bus_freq(BUS_FREQ_HIGH);
return ret;
}
@ -1300,7 +1305,8 @@ static int sdhci_esdhc_runtime_resume(struct device *dev)
struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
struct pltfm_imx_data *imx_data = pltfm_host->priv;
request_bus_freq(BUS_FREQ_HIGH);
if (imx_data->socdata->flags & ESDHC_FLAG_BUSFREQ)
request_bus_freq(BUS_FREQ_HIGH);
if (!sdhci_sdio_irq_enabled(host)) {
clk_prepare_enable(imx_data->clk_per);