From: Yangbo Lu <yangbo.lu@xxxxxxx> This patch is to set the sd clock divisor value above 3 in tuning mode Signed-off-by: Yinbo Zhu <yinbo.zhu@xxxxxxx> Signed-off-by: Yangbo Lu <yangbo.lu@xxxxxxx> --- drivers/mmc/host/sdhci-of-esdhc.c | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/drivers/mmc/host/sdhci-of-esdhc.c b/drivers/mmc/host/sdhci-of-esdhc.c index d4ec0a959a75..c4af026c3fba 100644 --- a/drivers/mmc/host/sdhci-of-esdhc.c +++ b/drivers/mmc/host/sdhci-of-esdhc.c @@ -824,9 +824,17 @@ 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); -- 2.17.1
