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mmc: uniphier-sd: Add control to switch UHS speed 

SD interface logic has the register to switch UHS speed.
The default is up to SDR25 and to support SDR50 or faster,
add uniphier_sd_speed_switch() function to switch the speed mode.

Signed-off-by: Kunihiko Hayashi <hayashi.kunihiko@socionext.com>
Link: https://lore.kernel.org/r/20230125010201.28246-4-hayashi.kunihiko@socionext.com
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
This commit is contained in:
Kunihiko Hayashi 2023-01-25 10:01:59 +09:00 committed by Ulf Hansson
parent 1c325ed9f9
commit 2cda1de0cb
1 changed files with 22 additions and 0 deletions
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22
drivers/mmc/host/uniphier-sd.c
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@ -54,6 +54,7 @@
#define UNIPHIER_SDCTRL_CHOFFSET 0x200
#define UNIPHIER_SDCTRL_MODE 0x30
#define UNIPHIER_SDCTRL_MODE_UHS1MOD BIT(15)
#define UNIPHIER_SDCTRL_MODE_SDRSEL BIT(14)
/*
* IP is extended to support various features: built-in DMA engine,
@ -429,6 +430,25 @@ static void uniphier_sd_hw_reset(struct mmc_host *mmc)
usleep_range(300, 1000);
}
static void uniphier_sd_speed_switch(struct tmio_mmc_host *host)
{
struct uniphier_sd_priv *priv = uniphier_sd_priv(host);
unsigned int offset;
u32 val = 0;
if (!(host->mmc->caps & MMC_CAP_UHS))
return;
if (host->mmc->ios.timing == MMC_TIMING_UHS_SDR50 ||
host->mmc->ios.timing == MMC_TIMING_UHS_SDR104)
val = UNIPHIER_SDCTRL_MODE_SDRSEL;
offset = UNIPHIER_SDCTRL_CHOFFSET * priv->sdctrl_ch
+ UNIPHIER_SDCTRL_MODE;
regmap_write_bits(priv->sdctrl_regmap, offset,
UNIPHIER_SDCTRL_MODE_SDRSEL, val);
}
static void uniphier_sd_uhs_enable(struct tmio_mmc_host *host, bool uhs_en)
{
struct uniphier_sd_priv *priv = uniphier_sd_priv(host);
@ -459,6 +479,8 @@ static void uniphier_sd_set_clock(struct tmio_mmc_host *host,
tmp &= ~CLK_CTL_SCLKEN;
writel(tmp, host->ctl + (CTL_SD_CARD_CLK_CTL << 1));
uniphier_sd_speed_switch(host);
if (clock == 0)
return;