[PATCH 3/4] sdio: mediatek: support sdr104_clk_delay in sdio

Yong Mao
2016-11-08T06:09:00Z

From: yong mao <yong.mao@mediatek.com>

In order to let sdio run stable with 200M clock,
we should setup the value of clock delay.

Signed-off-by: Yong Mao <yong.mao@mediatek.com>
Signed-off-by: Chaotian Jing <chaotian.jing@mediatek.com>
---
drivers/mmc/host/mtk-sd.c | 10 +++++++++-
1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/drivers/mmc/host/mtk-sd.c b/drivers/mmc/host/mtk-sd.c
index 37edf30..fba28f2 100644
--- a/drivers/mmc/host/mtk-sd.c
+++ b/drivers/mmc/host/mtk-sd.c
@@ -213,6 +213,7 @@

#define MSDC_PAD_TUNE_DATRRDLY (0x1f << 8) /* RW */
#define MSDC_PAD_TUNE_CMDRDLY (0x1f << 16) /* RW */
+#define MSDC_PAD_TUNE_CLKTDLY (0x1f << 27) /* RW */

#define PAD_DS_TUNE_DLY1 (0x1f << 2) /* RW */
#define PAD_DS_TUNE_DLY2 (0x1f << 7) /* RW */
@@ -335,6 +336,7 @@ struct msdc_host {
unsigned char timing;
bool vqmmc_enabled;
u32 hs400_ds_delay;
+ u32 sdr104_clk_delay;
bool hs400_mode; /* current eMMC will run at hs400 mode */
struct msdc_save_para save_para; /* used when gate HCLK */
struct msdc_tune_para def_tune_para; /* default tune setting */
@@ -1230,7 +1232,8 @@ static void msdc_init_hw(struct msdc_host *host)
writel(val, host->base + MSDC_INT);
spin_unlock_irqrestore(&host->irqlock, flags);

- writel(0, host->base + MSDC_PAD_TUNE);
+ sdr_set_field(host->base + MSDC_PAD_TUNE,
+ MSDC_PAD_TUNE_CLKTDLY, host->sdr104_clk_delay);
writel(0, host->base + MSDC_IOCON);
sdr_set_field(host->base + MSDC_IOCON, MSDC_IOCON_DDLSEL, 0);
writel(0x403c0046, host->base + MSDC_PATCH_BIT);
@@ -1671,6 +1674,11 @@ static int msdc_drv_probe(struct platform_device *pdev)
dev_dbg(&pdev->dev, "hs400-ds-delay: %x\n",
host->hs400_ds_delay);

+ if (!of_property_read_u32(pdev->dev.of_node, "sdr104-clk-delay",
+ &host->sdr104_clk_delay))
+ dev_dbg(&pdev->dev, "sdr104-clk-delay: %x\n",
+ host->sdr104_clk_delay);
+
host->dev = &pdev->dev;
host->mmc = mmc;
host->src_clk_freq = clk_get_rate(host->src_clk);
--
1.7.9.5