diff options
| author | Dong Aisheng <b29396@freescale.com> | 2014-01-17 10:23:22 +0800 |
|---|---|---|
| committer | Nitin Garg <nitin.garg@freescale.com> | 2015-01-15 21:18:01 -0600 |
| commit | 4a72202581e2c19653776dfb9be382122890566f (patch) | |
| tree | d6bb3ab2f2925538510319e9bf8219d5c08afd30 /drivers/mmc | |
| parent | e1421fd2da3cdf861146f32ff2294f8c51099e74 (diff) | |
ENGR00295564 mmc: sdhci-esdhc-imx: no need busfreq for imx6qdl
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)
Diffstat (limited to 'drivers/mmc')
| -rw-r--r-- | drivers/mmc/host/sdhci-esdhc-imx.c | 17 |
1 files changed, 12 insertions, 5 deletions
diff --git a/drivers/mmc/host/sdhci-esdhc-imx.c b/drivers/mmc/host/sdhci-esdhc-imx.c index 9b5968027907..a3959fd0902c 100644 --- a/drivers/mmc/host/sdhci-esdhc-imx.c +++ b/drivers/mmc/host/sdhci-esdhc-imx.c @@ -117,6 +117,8 @@ #define ESDHC_FLAG_HAVE_CAP1 BIT(6) /* The IP has errata ERR004536 */ #define ESDHC_FLAG_ERR004536 BIT(7) +/* need request bus freq during low power */ +#define ESDHC_FLAG_BUSFREQ BIT(8) struct esdhc_soc_data { u32 flags; @@ -144,7 +146,8 @@ 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_HAVE_CAP1 | ESDHC_FLAG_ERR004536 + | ESDHC_FLAG_BUSFREQ, }; struct pltfm_imx_data { @@ -1012,7 +1015,8 @@ 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); @@ -1166,7 +1170,8 @@ 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; @@ -1209,7 +1214,8 @@ static int sdhci_esdhc_runtime_suspend(struct device *dev) 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); return ret; } @@ -1220,7 +1226,8 @@ 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); clk_prepare_enable(imx_data->clk_per); clk_prepare_enable(imx_data->clk_ipg); |