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Subject[PATCH 6/6] mmc: sdhci_am654: Enable tuning for SDR50
Date
According to the SW tuning App note[1], tuning is required for all
UHS speed modes. Tuning for SDR50 is not enabled in Capabilities by
default so enable it from the CTL_CFG registers.

[1] https://www.ti.com/lit/pdf/spract9

Signed-off-by: Faiz Abbas <faiz_abbas@ti.com>
---
drivers/mmc/host/sdhci_am654.c | 6 ++++++
1 file changed, 6 insertions(+)

diff --git a/drivers/mmc/host/sdhci_am654.c b/drivers/mmc/host/sdhci_am654.c
index 5af7638ad606..2bce962bf7e4 100644
--- a/drivers/mmc/host/sdhci_am654.c
+++ b/drivers/mmc/host/sdhci_am654.c
@@ -19,9 +19,11 @@

/* CTL_CFG Registers */
#define CTL_CFG_2 0x14
+#define CTL_CFG_3 0x18

#define SLOTTYPE_MASK GENMASK(31, 30)
#define SLOTTYPE_EMBEDDED BIT(30)
+#define TUNINGFORSDR50_MASK BIT(13)

/* PHY Registers */
#define PHY_CTRL1 0x100
@@ -646,6 +648,10 @@ static int sdhci_am654_init(struct sdhci_host *host)
regmap_update_bits(sdhci_am654->base, CTL_CFG_2, SLOTTYPE_MASK,
ctl_cfg_2);

+ /* Enable tuning for SDR50 */
+ regmap_update_bits(sdhci_am654->base, CTL_CFG_3, TUNINGFORSDR50_MASK,
+ TUNINGFORSDR50_MASK);
+
ret = sdhci_setup_host(host);
if (ret)
return ret;
--
2.17.1
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