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    Subject[PATCH AUTOSEL for 4.9 109/190] mmc: sdhci-of-esdhc: limit SD clock for ls1012a/ls1046a
    Date
    From: yangbo lu <yangbo.lu@nxp.com>

    [ Upstream commit a627f025eb0534052ff451427c16750b3530634c ]

    The ls1046a datasheet specified that the max SD clock frequency
    for eSDHC SDR104/HS200 was 167MHz, and the ls1012a datasheet
    specified it's 125MHz for ls1012a. So this patch is to add the
    limitation.

    Signed-off-by: Yangbo Lu <yangbo.lu@nxp.com>
    Acked-by: Adrian Hunter <adrian.hunter@intel.com>
    Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
    Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
    ---
    drivers/mmc/host/sdhci-of-esdhc.c | 14 ++++++++++++++
    1 file changed, 14 insertions(+)

    diff --git a/drivers/mmc/host/sdhci-of-esdhc.c b/drivers/mmc/host/sdhci-of-esdhc.c
    index 3c27401cf7fe..a51d636c2312 100644
    --- a/drivers/mmc/host/sdhci-of-esdhc.c
    +++ b/drivers/mmc/host/sdhci-of-esdhc.c
    @@ -432,6 +432,20 @@ static void esdhc_of_set_clock(struct sdhci_host *host, unsigned int clock)
    if (esdhc->vendor_ver < VENDOR_V_23)
    pre_div = 2;

    + /*
    + * Limit SD clock to 167MHz for ls1046a according to its datasheet
    + */
    + if (clock > 167000000 &&
    + of_find_compatible_node(NULL, NULL, "fsl,ls1046a-esdhc"))
    + clock = 167000000;
    +
    + /*
    + * Limit SD clock to 125MHz for ls1012a according to its datasheet
    + */
    + if (clock > 125000000 &&
    + of_find_compatible_node(NULL, NULL, "fsl,ls1012a-esdhc"))
    + clock = 125000000;
    +
    /* Workaround to reduce the clock frequency for p1010 esdhc */
    if (of_find_compatible_node(NULL, NULL, "fsl,p1010-esdhc")) {
    if (clock > 20000000)
    --
    2.14.1
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