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-rw-r--r--drivers/mmc/host/sdhci-of-esdhc.c8
1 files changed, 8 insertions, 0 deletions
diff --git a/drivers/mmc/host/sdhci-of-esdhc.c b/drivers/mmc/host/sdhci-of-esdhc.c
index 68c5866f5c85..c56c7d413a09 100644
--- a/drivers/mmc/host/sdhci-of-esdhc.c
+++ b/drivers/mmc/host/sdhci-of-esdhc.c
@@ -830,9 +830,17 @@ static int esdhc_execute_tuning(struct mmc_host *mmc, u32 opcode)
struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
struct sdhci_esdhc *esdhc = sdhci_pltfm_priv(pltfm_host);
bool hs400_tuning;
+ unsigned int clk;
u32 val;
int ret;
+ /* For tuning mode, the sd clock divisor value
+ * must be larger than 3 according to reference manual.
+ */
+ clk = esdhc->peripheral_clock / 3;
+ if (host->clock > clk)
+ esdhc_of_set_clock(host, clk);
+
if (esdhc->quirk_limited_clk_division &&
host->flags & SDHCI_HS400_TUNING)
esdhc_of_set_clock(host, host->clock);