[PATCH 3/4] mmc: mediatek: Add tune support

From: Chaotian Jing
Date: Tue Oct 13 2015 - 05:38:41 EST

Add CMD19/CMD21 support for EMMC/SD/SDIO tuning
Add HS400 mode support

Signed-off-by: Chaotian Jing <chaotian.jing@xxxxxxxxxxxx>
---
drivers/mmc/host/mtk-sd.c | 359 ++++++++++++++++++++++++++++++++++++++++++----
1 file changed, 332 insertions(+), 27 deletions(-)

diff --git a/drivers/mmc/host/mtk-sd.c b/drivers/mmc/host/mtk-sd.c
index b2e89d3..f12a50a 100644
--- a/drivers/mmc/host/mtk-sd.c
+++ b/drivers/mmc/host/mtk-sd.c
@@ -26,6 +26,7 @@
#include <linux/pm.h>
#include <linux/pm_runtime.h>
#include <linux/regulator/consumer.h>
+#include <linux/slab.h>
#include <linux/spinlock.h>

#include <linux/mmc/card.h>
@@ -64,6 +65,7 @@
#define SDC_RESP2 0x48
#define SDC_RESP3 0x4c
#define SDC_BLK_NUM 0x50
+#define EMMC_IOCON 0x7c
#define SDC_ACMD_RESP 0x80
#define MSDC_DMA_SA 0x90
#define MSDC_DMA_CTRL 0x98
@@ -71,6 +73,8 @@
#define MSDC_PATCH_BIT 0xb0
#define MSDC_PATCH_BIT1 0xb4
#define MSDC_PAD_TUNE 0xec
+#define PAD_DS_TUNE 0x188
+#define EMMC50_CFG0 0x208

/*--------------------------------------------------------------------------*/
/* Register Mask */
@@ -87,6 +91,7 @@
#define MSDC_CFG_CKSTB (0x1 << 7) /* R */
#define MSDC_CFG_CKDIV (0xff << 8) /* RW */
#define MSDC_CFG_CKMOD (0x3 << 16) /* RW */
+#define MSDC_CFG_HS400_CK_MODE (0x1 << 18) /* RW */

/* MSDC_IOCON mask */
#define MSDC_IOCON_SDR104CKS (0x1 << 0) /* RW */
@@ -204,6 +209,17 @@
#define MSDC_PATCH_BIT_SPCPUSH (0x1 << 29) /* RW */
#define MSDC_PATCH_BIT_DECRCTMO (0x1 << 30) /* RW */

+#define MSDC_PAD_TUNE_DATRRDLY (0x1f << 8) /* RW */
+#define MSDC_PAD_TUNE_CMDRDLY (0x1f << 16) /* RW */
+
+#define PAD_DS_TUNE_DLY1 (0x1f << 2) /* RW */
+#define PAD_DS_TUNE_DLY2 (0x1f << 7) /* RW */
+#define PAD_DS_TUNE_DLY3 (0x1f << 12) /* RW */
+
+#define EMMC50_CFG_PADCMD_LATCHCK (0x1 << 0) /* RW */
+#define EMMC50_CFG_CRCSTS_EDGE (0x1 << 3) /* RW */
+#define EMMC50_CFG_CFCSTS_SEL (0x1 << 4) /* RW */
+
#define REQ_CMD_EIO (0x1 << 0)
#define REQ_CMD_TMO (0x1 << 1)
#define REQ_DAT_ERR (0x1 << 2)
@@ -219,6 +235,7 @@
#define CMD_TIMEOUT (HZ/10 * 5) /* 100ms x5 */
#define DAT_TIMEOUT (HZ * 5) /* 1000ms x5 */

+#define DELAY_MAX 32 /* PAD dalay cells */
/*--------------------------------------------------------------------------*/
/* Descriptor Structure */
/*--------------------------------------------------------------------------*/
@@ -265,6 +282,14 @@ struct msdc_save_para {
u32 pad_tune;
u32 patch_bit0;
u32 patch_bit1;
+ u32 pad_ds_tune;
+ u32 emmc50_cfg0;
+};
+
+struct msdc_delay_phase {
+ u8 maxlen;
+ u8 start;
+ u8 final_phase;
};

struct msdc_host {
@@ -293,12 +318,15 @@ struct msdc_host {
int irq; /* host interrupt */

struct clk *src_clk; /* msdc source clock */
+ struct clk *src_clk_parent; /* src_clk's parent */
+ struct clk *hs400_src; /* 400Mhz source clock */
struct clk *h_clk; /* msdc h_clk */
u32 mclk; /* mmc subsystem clock frequency */
u32 src_clk_freq; /* source clock frequency */
u32 sclk; /* SD/MS bus clock frequency */
- bool ddr;
+ unsigned char timing;
bool vqmmc_enabled;
+ u32 hs400_ds_delay;
struct msdc_save_para save_para; /* used when gate HCLK */
};

@@ -353,7 +381,10 @@ static void msdc_reset_hw(struct msdc_host *host)
static void msdc_cmd_next(struct msdc_host *host,
struct mmc_request *mrq, struct mmc_command *cmd);

-static u32 data_ints_mask = MSDC_INTEN_XFER_COMPL | MSDC_INTEN_DATTMO |
+static const u32 cmd_ints_mask = MSDC_INTEN_CMDRDY | MSDC_INTEN_RSPCRCERR |
+ MSDC_INTEN_CMDTMO | MSDC_INTEN_ACMDRDY |
+ MSDC_INTEN_ACMDCRCERR | MSDC_INTEN_ACMDTMO;
+static const u32 data_ints_mask = MSDC_INTEN_XFER_COMPL | MSDC_INTEN_DATTMO |
MSDC_INTEN_DATCRCERR | MSDC_INTEN_DMA_BDCSERR |
MSDC_INTEN_DMA_GPDCSERR | MSDC_INTEN_DMA_PROTECT;

@@ -485,7 +516,7 @@ static void msdc_ungate_clock(struct msdc_host *host)
cpu_relax();
}

-static void msdc_set_mclk(struct msdc_host *host, int ddr, u32 hz)
+static void msdc_set_mclk(struct msdc_host *host, unsigned char timing, u32 hz)
{
u32 mode;
u32 flags;
@@ -501,8 +532,15 @@ static void msdc_set_mclk(struct msdc_host *host, int ddr, u32 hz)

flags = readl(host->base + MSDC_INTEN);
sdr_clr_bits(host->base + MSDC_INTEN, flags);
- if (ddr) { /* may need to modify later */
- mode = 0x2; /* ddr mode and use divisor */
+ sdr_clr_bits(host->base + MSDC_CFG, MSDC_CFG_HS400_CK_MODE);
+ if (timing == MMC_TIMING_UHS_DDR50 ||
+ timing == MMC_TIMING_MMC_DDR52 ||
+ timing == MMC_TIMING_MMC_HS400) {
+ if (timing == MMC_TIMING_MMC_HS400)
+ mode = 0x3;
+ else
+ mode = 0x2; /* ddr mode and use divisor */
+
if (hz >= (host->src_clk_freq >> 2)) {
div = 0; /* mean div = 1/4 */
sclk = host->src_clk_freq >> 2; /* sclk = clk / 4 */
@@ -511,6 +549,13 @@ static void msdc_set_mclk(struct msdc_host *host, int ddr, u32 hz)
sclk = (host->src_clk_freq >> 2) / div;
div = (div >> 1);
}
+
+ if (timing == MMC_TIMING_MMC_HS400 &&
+ hz >= (host->src_clk_freq >> 1)) {
+ sdr_set_bits(host->base + MSDC_CFG, MSDC_CFG_HS400_CK_MODE);
+ sclk = host->src_clk_freq >> 1;
+ div = 0; /* div is ignore when bit18 is set */
+ }
} else if (hz >= host->src_clk_freq) {
mode = 0x1; /* no divisor */
div = 0;
@@ -532,12 +577,12 @@ static void msdc_set_mclk(struct msdc_host *host, int ddr, u32 hz)
cpu_relax();
host->sclk = sclk;
host->mclk = hz;
- host->ddr = ddr;
+ host->timing = timing;
/* need because clk changed. */
msdc_set_timeout(host, host->timeout_ns, host->timeout_clks);
sdr_set_bits(host->base + MSDC_INTEN, flags);

- dev_dbg(host->dev, "sclk: %d, ddr: %d\n", host->sclk, ddr);
+ dev_dbg(host->dev, "sclk: %d, timing: %d\n", host->sclk, timing);
}

static inline u32 msdc_cmd_find_resp(struct msdc_host *host,
@@ -725,10 +770,7 @@ static bool msdc_cmd_done(struct msdc_host *host, int events,
if (done)
return true;

- sdr_clr_bits(host->base + MSDC_INTEN, MSDC_INTEN_CMDRDY |
- MSDC_INTEN_RSPCRCERR | MSDC_INTEN_CMDTMO |
- MSDC_INTEN_ACMDRDY | MSDC_INTEN_ACMDCRCERR |
- MSDC_INTEN_ACMDTMO);
+ sdr_clr_bits(host->base + MSDC_INTEN, cmd_ints_mask);

if (cmd->flags & MMC_RSP_PRESENT) {
if (cmd->flags & MMC_RSP_136) {
@@ -818,10 +860,7 @@ static void msdc_start_command(struct msdc_host *host,
rawcmd = msdc_cmd_prepare_raw_cmd(host, mrq, cmd);
mod_delayed_work(system_wq, &host->req_timeout, DAT_TIMEOUT);

- sdr_set_bits(host->base + MSDC_INTEN, MSDC_INTEN_CMDRDY |
- MSDC_INTEN_RSPCRCERR | MSDC_INTEN_CMDTMO |
- MSDC_INTEN_ACMDRDY | MSDC_INTEN_ACMDCRCERR |
- MSDC_INTEN_ACMDTMO);
+ sdr_set_bits(host->base + MSDC_INTEN, cmd_ints_mask);
writel(cmd->arg, host->base + SDC_ARG);
writel(rawcmd, host->base + SDC_CMD);
}
@@ -895,7 +934,7 @@ static void msdc_data_xfer_next(struct msdc_host *host,
struct mmc_request *mrq, struct mmc_data *data)
{
if (mmc_op_multi(mrq->cmd->opcode) && mrq->stop && !mrq->stop->error &&
- (!data->bytes_xfered || !mrq->sbc))
+ !mrq->sbc)
msdc_start_command(host, mrq, mrq->stop);
else
msdc_request_done(host, mrq);
@@ -929,7 +968,7 @@ static bool msdc_data_xfer_done(struct msdc_host *host, u32 events,
while (readl(host->base + MSDC_DMA_CFG) & MSDC_DMA_CFG_STS)
cpu_relax();
sdr_clr_bits(host->base + MSDC_INTEN, data_ints_mask);
- dev_dbg(host->dev, "DMA stop\n");
+ dev_dbg(host->dev, "DMA stop event:0x%x\n", events);

if ((events & MSDC_INT_XFER_COMPL) && (!stop || !stop->error)) {
data->bytes_xfered = data->blocks * data->blksz;
@@ -941,6 +980,8 @@ static bool msdc_data_xfer_done(struct msdc_host *host, u32 events,

if (events & MSDC_INT_DATTMO)
data->error = -ETIMEDOUT;
+ else if (events & MSDC_INT_DATCRCERR)
+ data->error = -EILSEQ;

dev_err(host->dev, "%s: cmd=%d; blocks=%d",
__func__, mrq->cmd->opcode, data->blocks);
@@ -1112,10 +1153,14 @@ static void msdc_init_hw(struct msdc_host *host)

writel(0, host->base + MSDC_PAD_TUNE);
writel(0, host->base + MSDC_IOCON);
- sdr_set_field(host->base + MSDC_IOCON, MSDC_IOCON_DDLSEL, 1);
- writel(0x403c004f, host->base + MSDC_PATCH_BIT);
+ sdr_set_field(host->base + MSDC_IOCON, MSDC_IOCON_DDLSEL, 0);
+ writel(0x403c0046, host->base + MSDC_PATCH_BIT);
sdr_set_field(host->base + MSDC_PATCH_BIT, MSDC_CKGEN_MSDC_DLY_SEL, 1);
writel(0xffff0089, host->base + MSDC_PATCH_BIT1);
+ sdr_set_bits(host->base + EMMC50_CFG0, EMMC50_CFG_CFCSTS_SEL);
+
+ if (host->mmc->caps2 & MMC_CAP2_HS400_1_8V)
+ writel(host->hs400_ds_delay, host->base + PAD_DS_TUNE);
/* Configure to enable SDIO mode.
* it's must otherwise sdio cmd5 failed
*/
@@ -1151,7 +1196,6 @@ static void msdc_init_gpd_bd(struct msdc_host *host, struct msdc_dma *dma)

gpd->gpd_info = GPDMA_DESC_BDP; /* hwo, cs, bd pointer */
gpd->ptr = (u32)dma->bd_addr; /* physical address */
-
memset(bd, 0, sizeof(struct mt_bdma_desc) * MAX_BD_NUM);
for (i = 0; i < (MAX_BD_NUM - 1); i++)
bd[i].next = (u32)dma->bd_addr + sizeof(*bd) * (i + 1);
@@ -1161,20 +1205,16 @@ static void msdc_ops_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
{
struct msdc_host *host = mmc_priv(mmc);
int ret;
- u32 ddr = 0;

pm_runtime_get_sync(host->dev);

- if (ios->timing == MMC_TIMING_UHS_DDR50 ||
- ios->timing == MMC_TIMING_MMC_DDR52)
- ddr = 1;
-
msdc_set_buswidth(host, ios->bus_width);

/* Suspend/Resume will do power off/on */
switch (ios->power_mode) {
case MMC_POWER_UP:
if (!IS_ERR(mmc->supply.vmmc)) {
+ msdc_init_hw(host);
ret = mmc_regulator_set_ocr(mmc, mmc->supply.vmmc,
ios->vdd);
if (ret) {
@@ -1205,14 +1245,259 @@ static void msdc_ops_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
break;
}

- if (host->mclk != ios->clock || host->ddr != ddr)
- msdc_set_mclk(host, ddr, ios->clock);
+ if (host->mclk != ios->clock || host->timing != ios->timing)
+ msdc_set_mclk(host, ios->timing, ios->clock);

end:
pm_runtime_mark_last_busy(host->dev);
pm_runtime_put_autosuspend(host->dev);
}

+static u32 test_delay_bit(u32 delay, u32 bit)
+{
+ bit %= DELAY_MAX;
+ return delay & (1 << bit);
+}
+
+static int get_delay_len(u32 delay, u32 start_bit)
+{
+ int i;
+
+ for (i = 0; i < (DELAY_MAX - start_bit); i++) {
+ if (test_delay_bit(delay, start_bit + i) == 0)
+ return i;
+ }
+ return DELAY_MAX - start_bit;
+}
+
+static struct msdc_delay_phase get_best_delay(u32 delay)
+{
+ int start = 0, len = 0;
+ int start_final = 0, len_final = 0;
+ u8 final_phase = 0xff;
+ struct msdc_delay_phase delay_phase;
+
+ if (delay == 0) {
+ pr_err("phase error: [map:%x]\n", delay);
+ delay_phase.final_phase = final_phase;
+ return delay_phase;
+ }
+
+ while (start < DELAY_MAX) {
+ len = get_delay_len(delay, start);
+ if (len_final < len) {
+ start_final = start;
+ len_final = len;
+ }
+ start += len ? len : 1;
+ if (len >= 8 && start_final < 4)
+ break;
+ }
+
+ /* The rule is that to find the smallest delay cell */
+ if (start_final == 0)
+ final_phase = (start_final + len_final / 3) % DELAY_MAX;
+ else
+ final_phase = (start_final + len_final / 2) % DELAY_MAX;
+ pr_info("phase: [map:%x] [maxlen:%d] [final:%d]\n",
+ delay, len_final, final_phase);
+
+ delay_phase.maxlen = len_final;
+ delay_phase.start = start_final;
+ delay_phase.final_phase = final_phase;
+ return delay_phase;
+}
+
+static int msdc_send_tuning(struct mmc_host *host, u32 opcode, int *cmd_error)
+{
+ struct mmc_request mrq = {NULL};
+ struct mmc_command cmd = {0};
+ struct mmc_data data = {0};
+ struct scatterlist sg;
+ struct mmc_ios *ios = &host->ios;
+ int size, err = 0;
+ u8 *data_buf;
+
+ if (ios->bus_width == MMC_BUS_WIDTH_8)
+ size = 128;
+ else if (ios->bus_width == MMC_BUS_WIDTH_4)
+ size = 64;
+ else
+ return -EINVAL;
+
+ data_buf = kzalloc(size, GFP_KERNEL);
+ if (!data_buf)
+ return -ENOMEM;
+
+ mrq.cmd = &cmd;
+ mrq.data = &data;
+
+ cmd.opcode = opcode;
+ cmd.flags = MMC_RSP_R1 | MMC_CMD_ADTC;
+
+ data.blksz = size;
+ data.blocks = 1;
+ data.flags = MMC_DATA_READ;
+
+ /*
+ * According to the tuning specs, Tuning process
+ * is normally shorter 40 executions of CMD19,
+ * and timeout value should be shorter than 150 ms
+ */
+ data.timeout_ns = 150 * NSEC_PER_MSEC;
+
+ data.sg = &sg;
+ data.sg_len = 1;
+ sg_init_one(&sg, data_buf, size);
+
+ mmc_wait_for_req(host, &mrq);
+
+ if (cmd_error)
+ *cmd_error = cmd.error;
+
+ if (cmd.error) {
+ err = cmd.error;
+ goto out;
+ }
+
+ if (data.error) {
+ err = data.error;
+ goto out;
+ }
+
+out:
+ kfree(data_buf);
+ return err;
+}
+
+static int msdc_tune_response(struct mmc_host *mmc, u32 opcode)
+{
+ struct msdc_host *host = mmc_priv(mmc);
+ u32 rise_delay = 0, fall_delay = 0;
+ struct msdc_delay_phase final_rise_delay, final_fall_delay;
+ u8 final_delay, final_maxlen;
+ int cmd_err;
+ int i;
+
+ sdr_clr_bits(host->base + MSDC_IOCON, MSDC_IOCON_RSPL);
+ for (i = 0 ; i < DELAY_MAX; i++) {
+ sdr_set_field(host->base + MSDC_PAD_TUNE, MSDC_PAD_TUNE_CMDRDLY, i);
+ msdc_send_tuning(mmc, opcode, &cmd_err);
+ if (!cmd_err)
+ rise_delay |= (1 << i);
+ }
+
+ sdr_set_bits(host->base + MSDC_IOCON, MSDC_IOCON_RSPL);
+ for (i = 0; i < DELAY_MAX; i++) {
+ sdr_set_field(host->base + MSDC_PAD_TUNE, MSDC_PAD_TUNE_CMDRDLY, i);
+ msdc_send_tuning(mmc, opcode, &cmd_err);
+ if (!cmd_err)
+ fall_delay |= (1 << i);
+ }
+
+ final_rise_delay = get_best_delay(rise_delay);
+ final_fall_delay = get_best_delay(fall_delay);
+
+ final_maxlen = max(final_rise_delay.maxlen, final_fall_delay.maxlen);
+ if (final_maxlen == final_rise_delay.maxlen) {
+ sdr_clr_bits(host->base + MSDC_IOCON, MSDC_IOCON_RSPL);
+ sdr_set_field(host->base + MSDC_PAD_TUNE, MSDC_PAD_TUNE_CMDRDLY,
+ final_rise_delay.final_phase);
+ final_delay = final_rise_delay.final_phase;
+ } else {
+ sdr_set_bits(host->base + MSDC_IOCON, MSDC_IOCON_RSPL);
+ sdr_set_field(host->base + MSDC_PAD_TUNE, MSDC_PAD_TUNE_CMDRDLY,
+ final_fall_delay.final_phase);
+ final_delay = final_fall_delay.final_phase;
+ }
+
+ return final_delay;
+}
+
+static int msdc_tune_data(struct mmc_host *mmc, u32 opcode)
+{
+ struct msdc_host *host = mmc_priv(mmc);
+ u32 rise_delay = 0, fall_delay = 0;
+ struct msdc_delay_phase final_rise_delay, final_fall_delay;
+ u8 final_delay, final_maxlen;
+ int i, ret;
+
+ 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 < DELAY_MAX; i++) {
+ sdr_set_field(host->base + MSDC_PAD_TUNE, MSDC_PAD_TUNE_DATRRDLY, i);
+ ret = msdc_send_tuning(mmc, opcode, NULL);
+ if (!ret)
+ rise_delay |= (1 << i);
+ }
+
+ sdr_set_bits(host->base + MSDC_IOCON, MSDC_IOCON_DSPL);
+ sdr_set_bits(host->base + MSDC_IOCON, MSDC_IOCON_W_DSPL);
+ for (i = 0; i < DELAY_MAX; i++) {
+ sdr_set_field(host->base + MSDC_PAD_TUNE, MSDC_PAD_TUNE_DATRRDLY, i);
+ ret = msdc_send_tuning(mmc, opcode, NULL);
+ if (!ret)
+ fall_delay |= (1 << i);
+ }
+
+ final_rise_delay = get_best_delay(rise_delay);
+ final_fall_delay = get_best_delay(fall_delay);
+
+ final_maxlen = max(final_rise_delay.maxlen, final_fall_delay.maxlen);
+ /* Rising edge is more stable, prefer to use it */
+ if (final_rise_delay.maxlen >= 10)
+ final_maxlen = final_rise_delay.maxlen;
+ if (final_maxlen == final_rise_delay.maxlen) {
+ sdr_clr_bits(host->base + MSDC_IOCON, MSDC_IOCON_DSPL);
+ sdr_clr_bits(host->base + MSDC_IOCON, MSDC_IOCON_W_DSPL);
+ sdr_set_field(host->base + MSDC_PAD_TUNE, MSDC_PAD_TUNE_DATRRDLY,
+ final_rise_delay.final_phase);
+ final_delay = final_rise_delay.final_phase;
+ } else {
+ sdr_set_bits(host->base + MSDC_IOCON, MSDC_IOCON_DSPL);
+ sdr_set_bits(host->base + MSDC_IOCON, MSDC_IOCON_W_DSPL);
+ sdr_set_field(host->base + MSDC_PAD_TUNE, MSDC_PAD_TUNE_DATRRDLY,
+ final_fall_delay.final_phase);
+ final_delay = final_fall_delay.final_phase;
+ }
+
+ return final_delay;
+}
+
+static int msdc_execute_tuning(struct mmc_host *mmc, u32 opcode)
+{
+ struct msdc_host *host = mmc_priv(mmc);
+ int ret;
+
+ pm_runtime_get_sync(host->dev);
+ ret = msdc_tune_response(mmc, opcode);
+ if (ret == 0xff) {
+ dev_err(host->dev, "Tune response fail!\n");
+ ret = -EIO;
+ goto out;
+ }
+ ret = msdc_tune_data(mmc, opcode);
+ if (ret == 0xff) {
+ dev_err(host->dev, "Tune data fail!\n");
+ ret = -EIO;
+ goto out;
+ }
+ ret = 0;
+out:
+ pm_runtime_mark_last_busy(host->dev);
+ pm_runtime_put_autosuspend(host->dev);
+ return ret;
+}
+
+static void msdc_hw_reset(struct mmc_host *mmc)
+{
+ struct msdc_host *host = mmc_priv(mmc);
+
+ sdr_set_bits(host->base + EMMC_IOCON, 1);
+ udelay(10); /* 10us is enough */
+ sdr_clr_bits(host->base + EMMC_IOCON, 1);
+}
+
static struct mmc_host_ops mt_msdc_ops = {
.post_req = msdc_post_req,
.pre_req = msdc_pre_req,
@@ -1220,6 +1505,8 @@ static struct mmc_host_ops mt_msdc_ops = {
.set_ios = msdc_ops_set_ios,
.start_signal_voltage_switch = msdc_ops_switch_volt,
.card_busy = msdc_card_busy,
+ .execute_tuning = msdc_execute_tuning,
+ .hw_reset = msdc_hw_reset,
};

static int msdc_drv_probe(struct platform_device *pdev)
@@ -1260,6 +1547,16 @@ static int msdc_drv_probe(struct platform_device *pdev)
goto host_free;
}

+ host->src_clk_parent = clk_get_parent(host->src_clk);
+ host->hs400_src = devm_clk_get(&pdev->dev, "400mhz");
+ if (IS_ERR(host->hs400_src)) {
+ dev_dbg(&pdev->dev, "Cannot find 400mhz at dts!\n");
+ } else if (clk_set_parent(host->src_clk_parent, host->hs400_src) < 0) {
+ dev_err(host->dev, "Failed to set 400mhz source clock!\n");
+ ret = -EINVAL;
+ goto host_free;
+ }
+
host->h_clk = devm_clk_get(&pdev->dev, "hclk");
if (IS_ERR(host->h_clk)) {
ret = PTR_ERR(host->h_clk);
@@ -1293,6 +1590,10 @@ static int msdc_drv_probe(struct platform_device *pdev)
goto host_free;
}

+ if (!of_property_read_u32(pdev->dev.of_node, "hs400-ds-delay",
+ &host->hs400_ds_delay))
+ dev_dbg(&pdev->dev, "hs400-ds-delay: %x\n", host->hs400_ds_delay);
+
host->dev = &pdev->dev;
host->mmc = mmc;
host->src_clk_freq = clk_get_rate(host->src_clk);
@@ -1403,6 +1704,8 @@ static void msdc_save_reg(struct msdc_host *host)
host->save_para.pad_tune = readl(host->base + MSDC_PAD_TUNE);
host->save_para.patch_bit0 = readl(host->base + MSDC_PATCH_BIT);
host->save_para.patch_bit1 = readl(host->base + MSDC_PATCH_BIT1);
+ host->save_para.pad_ds_tune = readl(host->base + PAD_DS_TUNE);
+ host->save_para.emmc50_cfg0 = readl(host->base + EMMC50_CFG0);
}

static void msdc_restore_reg(struct msdc_host *host)
@@ -1413,6 +1716,8 @@ static void msdc_restore_reg(struct msdc_host *host)
writel(host->save_para.pad_tune, host->base + MSDC_PAD_TUNE);
writel(host->save_para.patch_bit0, host->base + MSDC_PATCH_BIT);
writel(host->save_para.patch_bit1, host->base + MSDC_PATCH_BIT1);
+ writel(host->save_para.pad_ds_tune, host->base + PAD_DS_TUNE);
+ writel(host->save_para.emmc50_cfg0, host->base + EMMC50_CFG0);
}

static int msdc_runtime_suspend(struct device *dev)
--
1.8.1.1.dirty

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