From 04509d77097914ae1bd351f4cec751d011844ca3 Mon Sep 17 00:00:00 2001 From: Yangbo Lu Date: Fri, 14 Jun 2019 16:29:53 +0800 Subject: mmc: sdhci-of-esdhc: set the sd clock divisor value above 3 This patch is to set the sd clock divisor value above 3 in tuning mode Signed-off-by: Yinbo Zhu Signed-off-by: Yangbo Lu Signed-off-by: Ulf Hansson --- drivers/mmc/host/sdhci-of-esdhc.c | 8 ++++++++ 1 file changed, 8 insertions(+) (limited to 'drivers/mmc') 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); -- cgit v1.2.3-55-g7522