Re: [PATCH v2 09/13] mmc: mediatek: add stop_clk fix and enhance_rx support
From: Matthias Brugger
Date: Mon Oct 09 2017 - 11:01:06 EST
On 10/09/2017 01:35 PM, Chaotian Jing wrote:
mt2712 supports stop_clk fix and enhance_rx, which can improve
host stability.
Signed-off-by: Chaotian Jing <chaotian.jing@xxxxxxxxxxxx>
---
drivers/mmc/host/mtk-sd.c | 47 +++++++++++++++++++++++++++++++++++++++++++----
1 file changed, 43 insertions(+), 4 deletions(-)
diff --git a/drivers/mmc/host/mtk-sd.c b/drivers/mmc/host/mtk-sd.c
index 555824d..5d99e05 100644
--- a/drivers/mmc/host/mtk-sd.c
+++ b/drivers/mmc/host/mtk-sd.c
@@ -67,6 +67,7 @@
#define SDC_RESP2 0x48
#define SDC_RESP3 0x4c
#define SDC_BLK_NUM 0x50
+#define SDC_ADV_CFG0 0x64
#define EMMC_IOCON 0x7c
#define SDC_ACMD_RESP 0x80
#define MSDC_DMA_SA 0x90
@@ -80,6 +81,7 @@
#define PAD_DS_TUNE 0x188
#define PAD_CMD_TUNE 0x18c
#define EMMC50_CFG0 0x208
+#define SDC_FIFO_CFG 0x228
/*--------------------------------------------------------------------------*/
/* Register Mask */
@@ -188,6 +190,9 @@
#define SDC_STS_CMDBUSY (0x1 << 1) /* RW */
#define SDC_STS_SWR_COMPL (0x1 << 31) /* RW */
+/* SDC_ADV_CFG0 mask */
+#define SDC_RX_ENHANCE_EN (0x1 << 20) /* RW */
+
/* MSDC_DMA_CTRL mask */
#define MSDC_DMA_CTRL_START (0x1 << 0) /* W */
#define MSDC_DMA_CTRL_STOP (0x1 << 1) /* W */
@@ -217,6 +222,8 @@
#define MSDC_PATCH_BIT_SPCPUSH (0x1 << 29) /* RW */
#define MSDC_PATCH_BIT_DECRCTMO (0x1 << 30) /* RW */
+#define MSDC_PATCH_BIT1_STOP_DLY (0xf << 8) /* RW */
+
#define MSDC_PATCH_BIT2_CFGRESP (0x1 << 15) /* RW */
#define MSDC_PATCH_BIT2_CFGCRCSTS (0x1 << 28) /* RW */
#define MSDC_PB2_RESPWAIT (0x3 << 2) /* RW */
@@ -242,6 +249,9 @@
#define EMMC50_CFG_CRCSTS_EDGE (0x1 << 3) /* RW */
#define EMMC50_CFG_CFCSTS_SEL (0x1 << 4) /* RW */
+#define SDC_FIFO_CFG_WRVALIDSEL (0x1 << 24) /* RW */
+#define SDC_FIFO_CFG_RDVALIDSEL (0x1 << 25) /* RW */
+
#define REQ_CMD_EIO (0x1 << 0)
#define REQ_CMD_TMO (0x1 << 1)
#define REQ_DAT_ERR (0x1 << 2)
@@ -308,6 +318,7 @@ struct msdc_save_para {
u32 pad_ds_tune;
u32 pad_cmd_tune;
u32 emmc50_cfg0;
+ u32 sdc_fifo_cfg;
};
struct mtk_mmc_compatible {
@@ -316,6 +327,8 @@ struct mtk_mmc_compatible {
bool async_fifo;
bool data_tune;
bool busy_check;
+ bool stop_clk_fix;
+ bool enhance_rx;
};
struct msdc_tune_para {
@@ -381,6 +394,8 @@ struct msdc_host {
.async_fifo = false,
.data_tune = false,
.busy_check = false,
+ .stop_clk_fix = false,
+ .enhance_rx = false,
};
static const struct mtk_mmc_compatible mt8173_compat = {
@@ -389,6 +404,8 @@ struct msdc_host {
.async_fifo = false,
.data_tune = false,
.busy_check = false,
+ .stop_clk_fix = false,
+ .enhance_rx = false,
};
If you add a flag for hs400_tune then mt8173_compat and mt8135_compat will be
actually different and therefore it will make sense that they exist both in the
driver code.
Regards,
Matthias
static const struct mtk_mmc_compatible mt2701_compat = {
@@ -397,6 +414,8 @@ struct msdc_host {
.async_fifo = true,
.data_tune = true,
.busy_check = false,
+ .stop_clk_fix = false,
+ .enhance_rx = false,
};
static const struct mtk_mmc_compatible mt2712_compat = {
@@ -405,6 +424,8 @@ struct msdc_host {
.async_fifo = true,
.data_tune = true,
.busy_check = true,
+ .stop_clk_fix = true,
+ .enhance_rx = true,
};
static const struct of_device_id msdc_of_ids[] = {
@@ -1281,15 +1302,31 @@ static void msdc_init_hw(struct msdc_host *host)
sdr_set_field(host->base + MSDC_PATCH_BIT, MSDC_CKGEN_MSDC_DLY_SEL, 1);
writel(0xffff4089, host->base + MSDC_PATCH_BIT1);
sdr_set_bits(host->base + EMMC50_CFG0, EMMC50_CFG_CFCSTS_SEL);
+
+ if (host->dev_comp->stop_clk_fix) {
+ sdr_set_field(host->base + MSDC_PATCH_BIT1,
+ MSDC_PATCH_BIT1_STOP_DLY, 3);
+ sdr_clr_bits(host->base + SDC_FIFO_CFG,
+ SDC_FIFO_CFG_WRVALIDSEL);
+ sdr_clr_bits(host->base + SDC_FIFO_CFG,
+ SDC_FIFO_CFG_RDVALIDSEL);
+ }
+
if (host->dev_comp->busy_check)
sdr_clr_bits(host->base + MSDC_PATCH_BIT1, (1 << 7));
+
if (host->dev_comp->async_fifo) {
sdr_set_field(host->base + MSDC_PATCH_BIT2,
MSDC_PB2_RESPWAIT, 3);
- sdr_set_field(host->base + MSDC_PATCH_BIT2,
- MSDC_PB2_RESPSTSENSEL, 2);
- sdr_set_field(host->base + MSDC_PATCH_BIT2,
- MSDC_PB2_CRCSTSENSEL, 2);
+ if (host->dev_comp->enhance_rx) {
+ sdr_set_bits(host->base + SDC_ADV_CFG0,
+ SDC_RX_ENHANCE_EN);
+ } else {
+ sdr_set_field(host->base + MSDC_PATCH_BIT2,
+ MSDC_PB2_RESPSTSENSEL, 2);
+ sdr_set_field(host->base + MSDC_PATCH_BIT2,
+ MSDC_PB2_CRCSTSENSEL, 2);
+ }
/* use async fifo, then no need tune internal delay */
sdr_clr_bits(host->base + MSDC_PATCH_BIT2,
MSDC_PATCH_BIT2_CFGRESP);
@@ -1946,6 +1983,7 @@ static void msdc_save_reg(struct msdc_host *host)
host->save_para.pad_ds_tune = readl(host->base + PAD_DS_TUNE);
host->save_para.pad_cmd_tune = readl(host->base + PAD_CMD_TUNE);
host->save_para.emmc50_cfg0 = readl(host->base + EMMC50_CFG0);
+ host->save_para.sdc_fifo_cfg = readl(host->base + SDC_FIFO_CFG);
}
static void msdc_restore_reg(struct msdc_host *host)
@@ -1964,6 +2002,7 @@ static void msdc_restore_reg(struct msdc_host *host)
writel(host->save_para.pad_ds_tune, host->base + PAD_DS_TUNE);
writel(host->save_para.pad_cmd_tune, host->base + PAD_CMD_TUNE);
writel(host->save_para.emmc50_cfg0, host->base + EMMC50_CFG0);
+ writel(host->save_para.sdc_fifo_cfg, host->base + SDC_FIFO_CFG);
}
static int msdc_runtime_suspend(struct device *dev)