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Commit f5b13ef2 authored by Veerabhadrarao Badiganti's avatar Veerabhadrarao Badiganti Committed by Greg Kroah-Hartman
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mmc: sdhci-msm: Clear tuning done flag while hs400 tuning 



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: ff06ce41 ("mmc: sdhci-msm: Add HS400 platform support")
Cc: stable@vger.kernel.org
Signed-off-by: default avatarVeerabhadrarao Badiganti <vbadigan@codeaurora.org>
Link: https://lore.kernel.org/r/1590678838-18099-1-git-send-email-vbadigan@codeaurora.org


Signed-off-by: default avatarUlf Hansson <ulf.hansson@linaro.org>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent bfc12ff9

drivers/mmc/host/sdhci-msm.c

+6 −0
Original line number Diff line number Diff line
@@ -1112,6 +1112,12 @@ static int sdhci_msm_execute_tuning(struct mmc_host *mmc, u32 opcode) 
	/* Clock-Data-Recovery used to dynamically adjust RX sampling point */

	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