[U-Boot] [PATCH 3/5] mmc: mtk-sd: add HS200 support

[mingming lee]

add HS200 mode and tune support

Signed-off-by: mingming lee <mingming.lee at mediatek.com>
---
 drivers/mmc/mtk-sd.c | 30 ++++++++++++++++++++++++------
 1 file changed, 24 insertions(+), 6 deletions(-)

diff --git a/drivers/mmc/mtk-sd.c b/drivers/mmc/mtk-sd.c
index f555357af2..bede4153b3 100644
--- a/drivers/mmc/mtk-sd.c
+++ b/drivers/mmc/mtk-sd.c
@@ -362,6 +362,8 @@ static u32 msdc_cmd_prepare_raw_cmd(struct msdc_host *host,
 	case MMC_CMD_WRITE_SINGLE_BLOCK:
 	case MMC_CMD_READ_SINGLE_BLOCK:
 	case SD_CMD_APP_SEND_SCR:
+	case MMC_CMD_SEND_TUNING_BLOCK:
+	case MMC_CMD_SEND_TUNING_BLOCK_HS200:
 		dtype = 1;
 		break;
 	case SD_CMD_SWITCH_FUNC: /* same as MMC_CMD_SWITCH */
@@ -467,6 +469,14 @@ static int msdc_start_command(struct msdc_host *host, struct mmc_cmd *cmd,
 	if (!msdc_cmd_is_ready(host))
 		return -EIO;
 
+	if ((readl(&host->base->msdc_fifocs) &
+	    MSDC_FIFOCS_TXCNT_M) >> MSDC_FIFOCS_TXCNT_S ||
+	    (readl(&host->base->msdc_fifocs) &
+	    MSDC_FIFOCS_RXCNT_M) >> MSDC_FIFOCS_RXCNT_S) {
+		pr_err("TX/RX FIFO non-empty before start of IO. Reset\n");
+		msdc_reset_hw(host);
+	}
+
 	msdc_fifo_clr(host);
 
 	host->last_resp_type = cmd->resp_type;
@@ -650,14 +660,22 @@ static int msdc_ops_send_cmd(struct udevice *dev, struct mmc_cmd *cmd,
 			     struct mmc_data *data)
 {
 	struct msdc_host *host = dev_get_priv(dev);
-	int ret;
+	int cmd_ret, data_ret;
 
-	ret = msdc_start_command(host, cmd, data);
-	if (ret)
-		return ret;
+	cmd_ret = msdc_start_command(host, cmd, data);
+	if (cmd_ret &&
+	    !(cmd_ret == -EIO &&
+	    (cmd->cmdidx == MMC_CMD_SEND_TUNING_BLOCK ||
+	    cmd->cmdidx == MMC_CMD_SEND_TUNING_BLOCK_HS200)))
+		return cmd_ret;
 
-	if (data)
-		return msdc_start_data(host, data);
+	if (data) {
+		data_ret = msdc_start_data(host, data);
+		if (cmd_ret)
+			return cmd_ret;
+		else
+			return data_ret;
+	}
 
 	return 0;
 }
-- 
2.18.0