OpenWrt – Rev 4
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From de14d1d0dc7ecf5c3e7e2a591b4f14e688fa52e6 Mon Sep 17 00:00:00 2001
From: Chaotian Jing <chaotian.jing@mediatek.com>
Date: Mon, 16 Oct 2017 09:46:37 +0800
Subject: [PATCH 158/224] 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: Chaotian Jing <chaotian.jing@mediatek.com>
Tested-by: Sean Wang <sean.wang@mediatek.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
---
drivers/mmc/host/mtk-sd.c | 6 ++++++
1 file changed, 6 insertions(+)
--- a/drivers/mmc/host/mtk-sd.c
+++ b/drivers/mmc/host/mtk-sd.c
@@ -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_hos
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
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);