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    Subject[PATCH 4.14 071/190] mmc: sdhci-msm: Clear tuning done flag while hs400 tuning
    Date
    From: Veerabhadrarao Badiganti <vbadigan@codeaurora.org>

    commit 9253d71011c349d5f5cc0cebdf68b4a80811b92d upstream.

    Clear tuning_done flag while executing tuning to ensure vendor
    specific HS400 settings are applied properly when the controller
    is re-initialized in HS400 mode.

    Without this, re-initialization of the qcom SDHC in HS400 mode fails
    while resuming the driver from runtime-suspend or system-suspend.

    Fixes: ff06ce417828 ("mmc: sdhci-msm: Add HS400 platform support")
    Cc: stable@vger.kernel.org
    Signed-off-by: Veerabhadrarao Badiganti <vbadigan@codeaurora.org>
    Link: https://lore.kernel.org/r/1590678838-18099-1-git-send-email-vbadigan@codeaurora.org
    Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
    Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

    ---
    drivers/mmc/host/sdhci-msm.c | 6 ++++++
    1 file changed, 6 insertions(+)

    --- a/drivers/mmc/host/sdhci-msm.c
    +++ b/drivers/mmc/host/sdhci-msm.c
    @@ -861,6 +861,12 @@ static int sdhci_msm_execute_tuning(stru
    msm_host->use_cdr = true;

    /*
    + * Clear tuning_done flag before tuning to ensure proper
    + * HS400 settings.
    + */
    + msm_host->tuning_done = 0;
    +
    + /*
    * For HS400 tuning in HS200 timing requires:
    * - select MCLK/2 in VENDOR_SPEC
    * - program MCLK to 400MHz (or nearest supported) in GCC

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