Commit 2cda1de0 authored by Kunihiko Hayashi's avatar Kunihiko Hayashi Committed by Ulf Hansson
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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: default avatarKunihiko Hayashi <hayashi.kunihiko@socionext.com>
Link: https://lore.kernel.org/r/20230125010201.28246-4-hayashi.kunihiko@socionext.com


Signed-off-by: default avatarUlf Hansson <ulf.hansson@linaro.org>
parent 1c325ed9

drivers/mmc/host/uniphier-sd.c

+22 −0
Original line number Diff line number Diff line
@@ -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;