DDR50 tuning is optinally defined in sd 3.0 spec. For example,
i.MX uSDHC internally already uses a fixed optimized timing for
DDR50, normally does not require tuning for DDR50 mode.
So this patch make DDR50 tuning optionally and platform can claim
SDHCI_DDR50_NEEDS_TUNING to support if it wants tuning.
Signed-off-by: Haibo Chen <haibo.chen@xxxxxxx>
---
drivers/mmc/host/sdhci.c | 6 +++++-
drivers/mmc/host/sdhci.h | 1 +
2 files changed, 6 insertions(+), 1 deletion(-)
diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c
index 67e43ec..144418e 100644
--- a/drivers/mmc/host/sdhci.c
+++ b/drivers/mmc/host/sdhci.c
@@ -2429,9 +2429,13 @@ int sdhci_execute_tuning(struct mmc_host *mmc, u32 opcode)
break;
case MMC_TIMING_UHS_SDR104:
- case MMC_TIMING_UHS_DDR50:
break;
+ case MMC_TIMING_UHS_DDR50:
+ if (host->flags & SDHCI_DDR50_NEEDS_TUNING)
+ break;
+ /* FALLTHROUGH */
+
case MMC_TIMING_UHS_SDR50:
if (host->flags & SDHCI_SDR50_NEEDS_TUNING)
break;
diff --git a/drivers/mmc/host/sdhci.h b/drivers/mmc/host/sdhci.h
index 6cc9a3c..58b363b 100644
--- a/drivers/mmc/host/sdhci.h
+++ b/drivers/mmc/host/sdhci.h
@@ -506,6 +506,7 @@ struct sdhci_host {
#define SDHCI_REQ_USE_DMA (1<<2) /* Use DMA for this req. */
#define SDHCI_DEVICE_DEAD (1<<3) /* Device unresponsive */
#define SDHCI_SDR50_NEEDS_TUNING (1<<4) /* SDR50 needs tuning */
+#define SDHCI_DDR50_NEEDS_TUNING (1<<5) /* DDR50 needs tuning */
#define SDHCI_AUTO_CMD12 (1<<6) /* Auto CMD12 support */
#define SDHCI_AUTO_CMD23 (1<<7) /* Auto CMD23 support */
#define SDHCI_PV_ENABLED (1<<8) /* Preset value enabled */
--
1.9.1
