diff options
| author | Kunihiko Hayashi <hayashi.kunihiko@socionext.com> | 2023-01-25 10:01:59 +0900 |
|---|---|---|
| committer | Ulf Hansson <ulf.hansson@linaro.org> | 2023-01-27 11:55:50 +0100 |
| commit | 2cda1de0cb578900de6ac17a32d1d859f4798b99 (patch) | |
| tree | a25842ac96ac372d4ddbedeef9dd136602f18235 /drivers/mmc | |
| parent | 1c325ed9f95ad283926753558d364df1cd73410a (diff) | |
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>
Diffstat (limited to 'drivers/mmc')
| -rw-r--r-- | drivers/mmc/host/uniphier-sd.c | 22 |
1 files changed, 22 insertions, 0 deletions
diff --git a/drivers/mmc/host/uniphier-sd.c b/drivers/mmc/host/uniphier-sd.c index c9766d6a690f..61acd69fac0e 100644 --- a/drivers/mmc/host/uniphier-sd.c +++ b/drivers/mmc/host/uniphier-sd.c @@ -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; |