[PATCH 1/4] mmc: mediatek: do not tune data for HS400 mode
From: chaotian.jing@mediatek.com (Chaotian Jing)
Date: 2016-06-30 02:01:30
Also in:
linux-mediatek, linux-mmc, lkml
Subsystem:
mediatek mmc/sd/sdio driver, multimedia card (mmc), secure digital (sd) and sdio subsystem, the rest · Maintainers:
Chaotian Jing, Ulf Hansson, Linus Torvalds
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> --- drivers/mmc/host/mtk-sd.c | 10 +++++++--- 1 file changed, 7 insertions(+), 3 deletions(-)
diff --git a/drivers/mmc/host/mtk-sd.c b/drivers/mmc/host/mtk-sd.c
index 5642f71..4d7ce65 100644
--- a/drivers/mmc/host/mtk-sd.c
+++ b/drivers/mmc/host/mtk-sd.c@@ -326,6 +326,7 @@ struct msdc_host { unsigned char timing; bool vqmmc_enabled; u32 hs400_ds_delay; + bool hs400_mode; /* current eMMC will run at hs400 mode */ 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"); return ret; } - ret = msdc_tune_data(mmc, opcode); - if (ret == -EIO) - dev_err(host->dev, "Tune data fail!\n"); + if (host->hs400_mode == false) { + ret = msdc_tune_data(mmc, opcode); + if (ret == -EIO) + dev_err(host->dev, "Tune data fail!\n"); + } 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) { struct msdc_host *host = mmc_priv(mmc); + host->hs400_mode = true; writel(host->hs400_ds_delay, host->base + PAD_DS_TUNE); return 0;
--
1.8.1.1.dirty