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mmc: core: Add ->hs400_prepare_ddr() callback

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Some eMMC controllers need specific settings for HS400 mode before the
speed mode can be switched to DDR mode, during the HS400 initialization
sequence. For that reason, let's introduce a new host callback,
->hs400_prepare_ddr() and invoked it just before switching to DDR mode.

Signed-off-by: Yinbo Zhu <yinbo.zhu@nxp.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
This commit is contained in:
Yinbo Zhu 2018-11-23 11:15:33 +08:00 committed by Ulf Hansson
parent 52b5f5cfa2
commit cc14eec088
2 changed files with 6 additions and 0 deletions
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3
drivers/mmc/core/mmc.c
View File

@ -1181,6 +1181,9 @@ static int mmc_select_hs400(struct mmc_card *card)
if (err)
goto out_err;
if (host->ops->hs400_prepare_ddr)
host->ops->hs400_prepare_ddr(host);
/* Switch card to DDR */
err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
EXT_CSD_BUS_WIDTH,

3
include/linux/mmc/host.h
View File

@ -147,6 +147,9 @@ struct mmc_host_ops {
/* Prepare HS400 target operating frequency depending host driver */
int (*prepare_hs400_tuning)(struct mmc_host *host, struct mmc_ios *ios);
/* Prepare switch to DDR during the HS400 init sequence */
int (*hs400_prepare_ddr)(struct mmc_host *host);
/* Prepare for switching from HS400 to HS200 */
void (*hs400_downgrade)(struct mmc_host *host);