[PATCH 6/6] mmc: sdhci_am654: Enable tuning for SDR50
From: Faiz Abbas <hidden>
Date: 2020-09-23 10:53:00
Also in:
linux-devicetree, linux-mmc, lkml
Subsystem:
multimedia card (mmc), secure digital (sd) and sdio subsystem, secure digital host controller interface (sdhci) driver, the rest · Maintainers:
Ulf Hansson, Adrian Hunter, Linus Torvalds
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 <redacted> --- 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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