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mmc: core: add a 'doing_init_tune' flag and a 'mmc_doing_tune' helper 

Our driver needs to know when tuning is in progress. 'doing_retune' only
covers re-tuning, not the initial tuning. Add another flag to detect the
initial tuning state and add a helper which tells us if any kind of
tuning is going on. Only implemented for MMC currently because that's
where we need it. SD can be added later if it becomes necessary.

Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Reviewed-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
Tested-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
Link: https://lore.kernel.org/r/20200901150250.26236-3-wsa+renesas@sang-engineering.com
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
zero-sugar-mainline-defconfig
Wolfram Sang 2020-09-01 17:02:48 +02:00 committed by Ulf Hansson
parent 24fdcb3778
commit 97a7d87e96
2 changed files with 10 additions and 0 deletions
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4
drivers/mmc/core/mmc.c
View File

@ -1763,6 +1763,8 @@ static int mmc_init_card(struct mmc_host *host, u32 ocr,
goto free_card;
if (mmc_card_hs200(card)) {
host->doing_init_tune = 1;
err = mmc_hs200_tuning(card);
if (err)
goto free_card;
@ -1770,6 +1772,8 @@ static int mmc_init_card(struct mmc_host *host, u32 ocr,
err = mmc_select_hs400(card);
if (err)
goto free_card;
host->doing_init_tune = 0;
} else if (!mmc_card_hs400es(card)) {
/* Select the desired bus width optionally */
err = mmc_select_bus_width(card);

6
include/linux/mmc/host.h
View File

@ -400,6 +400,7 @@ struct mmc_host {
unsigned int use_spi_crc:1;
unsigned int claimed:1; /* host exclusively claimed */
unsigned int bus_dead:1; /* bus has been released */
unsigned int doing_init_tune:1; /* initial tuning in progress */
unsigned int can_retune:1; /* re-tuning can be used */
unsigned int doing_retune:1; /* re-tuning in progress */
unsigned int retune_now:1; /* do re-tuning at next req */
@ -595,6 +596,11 @@ static inline bool mmc_doing_retune(struct mmc_host *host)
return host->doing_retune == 1;
}
static inline bool mmc_doing_tune(struct mmc_host *host)
{
return host->doing_retune == 1 || host->doing_init_tune == 1;
}
static inline enum dma_data_direction mmc_get_dma_dir(struct mmc_data *data)
{
return data->flags & MMC_DATA_WRITE ? DMA_TO_DEVICE : DMA_FROM_DEVICE;