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mmc: mediatek: do not tune data for HS400 mode 

for hs400 mode, should only tune DS delay, should not
tune PAD_TUNE for data path.
if eMMC will run at hs400 mode, do not tune data while
call ops->execute_tuning().

Signed-off-by: Chaotian Jing <chaotian.jing@mediatek.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
This commit is contained in:
Chaotian Jing 2016-06-30 10:00:58 +08:00 committed by Ulf Hansson
parent faecf41106
commit 5462ff39c4
1 changed files with 7 additions and 3 deletions
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4
drivers/mmc/host/mtk-sd.c
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@ -326,6 +326,7 @@ struct msdc_host {
unsigned char timing; unsigned char timing;
bool vqmmc_enabled; bool vqmmc_enabled;
u32 hs400_ds_delay; u32 hs400_ds_delay;
bool hs400_mode; /* current eMMC will run at hs400 mode */
struct msdc_save_para save_para; /* used when gate HCLK */ struct msdc_save_para save_para; /* used when gate HCLK */
}; };
@ -1402,9 +1403,11 @@ static int msdc_execute_tuning(struct mmc_host *mmc, u32 opcode)
dev_err(host->dev, "Tune response fail!\n"); dev_err(host->dev, "Tune response fail!\n");
return ret; return ret;
} }
if (host->hs400_mode == false) {
ret = msdc_tune_data(mmc, opcode); ret = msdc_tune_data(mmc, opcode);
if (ret == -EIO) if (ret == -EIO)
dev_err(host->dev, "Tune data fail!\n"); dev_err(host->dev, "Tune data fail!\n");
}
return ret; return ret;
} }
@ -1412,6 +1415,7 @@ static int msdc_execute_tuning(struct mmc_host *mmc, u32 opcode)
static int msdc_prepare_hs400_tuning(struct mmc_host *mmc, struct mmc_ios *ios) static int msdc_prepare_hs400_tuning(struct mmc_host *mmc, struct mmc_ios *ios)
{ {
struct msdc_host *host = mmc_priv(mmc); struct msdc_host *host = mmc_priv(mmc);
host->hs400_mode = true;
writel(host->hs400_ds_delay, host->base + PAD_DS_TUNE); writel(host->hs400_ds_delay, host->base + PAD_DS_TUNE);
return 0; return 0;