[lkml]   [2020]   [May]   [28]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
Patch in this message
Subject[PATCH V1] mmc: sdhci-msm: Clear tuning done flag while hs400 tuning
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")
Signed-off-by: Veerabhadrarao Badiganti <>
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
 \ /
  Last update: 2020-05-28 17:15    [W:0.042 / U:0.896 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site