Re: [PATCH V1] mmc: sdhci-msm: Clear tuning done flag while hs400 tuning

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On 5/29/2020 4:05 PM, Ulf Hansson wrote:
On Thu, 28 May 2020 at 17:14, Veerabhadrarao Badiganti
<vbadigan@xxxxxxxxxxxxxx> wrote:
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: ff06ce4 ("mmc: sdhci-msm: Add HS400 platform support")
Cc: stable@xxxxxxxxxxxxxxx
Signed-off-by: Veerabhadrarao Badiganti <vbadigan@xxxxxxxxxxxxxx>
Applied for next, thanks!

Kind regards
Uffe
Thanks Ulf.
I see a mail on this patch, that SHA in the commit text should be 12 digit.
Let me know if i have to re-post this patch by correcting it.
---
  drivers/mmc/host/sdhci-msm.c | 6 ++++++
  1 file changed, 6 insertions(+)

diff --git a/drivers/mmc/host/sdhci-msm.c b/drivers/mmc/host/sdhci-msm.c
index 95cd973..b277dd7 100644
--- a/drivers/mmc/host/sdhci-msm.c
+++ b/drivers/mmc/host/sdhci-msm.c
@@ -1174,6 +1174,12 @@ static int sdhci_msm_execute_tuning(struct mmc_host *mmc, u32 opcode)
         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
--
Qualcomm India Private Limited, on behalf of Qualcomm Innovation Center, Inc., is a member of Code Aurora Forum, a Linux Foundation Collaborative Project




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