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[5/7] mmc: sdhci_am654: Update delay chain configuration

Message ID 20200619125801.9530-6-faiz_abbas@ti.com (mailing list archive)
State New, archived
Headers show
Series Add support for SD card in AM654x-evm | expand

Commit Message

Faiz Abbas June 19, 2020, 12:57 p.m. UTC 
For speed modes where DLL is not enabled write to TXDLYCLK to enable
transmitter delay chain mode.

Signed-off-by: Faiz Abbas <faiz_abbas@ti.com>
---
 drivers/mmc/host/sdhci_am654.c | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)
diff mbox series

Patch

diff --git a/drivers/mmc/host/sdhci_am654.c b/drivers/mmc/host/sdhci_am654.c
index 8b0f69012d09..f7535ee3a232 100644
--- a/drivers/mmc/host/sdhci_am654.c
+++ b/drivers/mmc/host/sdhci_am654.c
@@ -61,6 +61,8 @@ 
 #define CALDONE_MASK		BIT(CALDONE_SHIFT)
 #define RETRIM_SHIFT		17
 #define RETRIM_MASK		BIT(RETRIM_SHIFT)
+#define SELDLYTXCLK_SHIFT	17
+#define SELDLYTXCLK_MASK	BIT(SELDLYTXCLK_SHIFT)
 
 #define DRIVER_STRENGTH_50_OHM	0x0
 #define DRIVER_STRENGTH_33_OHM	0x1
@@ -228,8 +230,14 @@  static void sdhci_am654_set_clock(struct sdhci_host *host, unsigned int clock)
 
 	regmap_update_bits(sdhci_am654->base, PHY_CTRL4, mask, val);
 
-	if (timing > MMC_TIMING_UHS_SDR25 && clock > CLOCK_TOO_SLOW_HZ)
+	if (timing > MMC_TIMING_UHS_SDR25 && clock > CLOCK_TOO_SLOW_HZ) {
+		regmap_update_bits(sdhci_am654->base, PHY_CTRL5,
+				   SELDLYTXCLK_MASK, 0);
 		sdhci_am654_setup_dll(host, clock);
+	} else {
+		regmap_update_bits(sdhci_am654->base, PHY_CTRL5,
+				   SELDLYTXCLK_MASK, 1 << SELDLYTXCLK_SHIFT);
+	}
 }
 
 static void sdhci_j721e_4bit_set_clock(struct sdhci_host *host,