From: Veerabhadrarao Badiganti <vbadigan@codeaurora.org>
To: adrian.hunter@intel.com, ulf.hansson@linaro.org,
bjorn.andersson@linaro.org
Cc: linux-mmc@vger.kernel.org, linux-kernel@vger.kernel.org,
linux-arm-msm@vger.kernel.org,
Veerabhadrarao Badiganti <vbadigan@codeaurora.org>,
stable@vger.kernel.org, Andy Gross <agross@kernel.org>,
Ritesh Harjani <riteshh@codeaurora.org>,
Venkat Gopalakrishnan <venkatg@codeaurora.org>
Subject: [PATCH V1] mmc: sdhci-msm: Clear tuning done flag while hs400 tuning
Date: Thu, 28 May 2020 20:43:52 +0530 [thread overview]
Message-ID: <1590678838-18099-1-git-send-email-vbadigan@codeaurora.org> (raw)
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@vger.kernel.org
Signed-off-by: Veerabhadrarao Badiganti <vbadigan@codeaurora.org>
---
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
next reply other threads:[~2020-05-28 15:14 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-05-28 15:13 Veerabhadrarao Badiganti [this message]
2020-05-29 10:35 ` Ulf Hansson
2020-05-29 13:41 ` Veerabhadrarao Badiganti
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