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Commit d17bb71c authored by Chaotian Jing's avatar Chaotian Jing Committed by Ulf Hansson
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mmc: mediatek: add latch-ck support 



some platform(eg.mt2701) does not support "stop clk fix", in
this case, need set correct latch-ck to avoid crc error caused
by stop clock block-internally.

Signed-off-by: default avatarChaotian Jing <chaotian.jing@mediatek.com>
Tested-by: default avatarSean Wang <sean.wang@mediatek.com>
Signed-off-by: default avatarUlf Hansson <ulf.hansson@linaro.org>
parent 3c1a8844

drivers/mmc/host/mtk-sd.c

+6 −0
Original line number Diff line number Diff line
@@ -378,6 +378,7 @@ struct msdc_host { 
	u32 sclk;		/* SD/MS bus clock frequency */

	unsigned char timing;

	bool vqmmc_enabled;

	u32 latch_ck;

	u32 hs400_ds_delay;

	u32 hs200_cmd_int_delay; /* cmd internal delay for HS200/SDR104 */

	u32 hs400_cmd_int_delay; /* cmd internal delay for HS400 */
@@ -1661,6 +1662,8 @@ static int msdc_tune_data(struct mmc_host *mmc, u32 opcode) 
	u32 tune_reg = host->dev_comp->pad_tune_reg;

	int i, ret;



	sdr_set_field(host->base + MSDC_PATCH_BIT, MSDC_INT_DAT_LATCH_CK_SEL,

		      host->latch_ck);

	sdr_clr_bits(host->base + MSDC_IOCON, MSDC_IOCON_DSPL);

	sdr_clr_bits(host->base + MSDC_IOCON, MSDC_IOCON_W_DSPL);

	for (i = 0 ; i < PAD_DELAY_MAX; i++) {
@@ -1773,6 +1776,9 @@ static const struct mmc_host_ops mt_msdc_ops = { 
static void msdc_of_property_parse(struct platform_device *pdev,

				   struct msdc_host *host)

{

	of_property_read_u32(pdev->dev.of_node, "mediatek,latch-ck",

			     &host->latch_ck);



	of_property_read_u32(pdev->dev.of_node, "hs400-ds-delay",

			     &host->hs400_ds_delay);