linux-kernel - [PATCH] mmc: sdhci-msm: Enable restore_dll

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Date:   Thu, 27 Aug 2020 20:51:28 +0530
From:   Veerabhadrarao Badiganti <vbadigan@...eaurora.org>
To:     adrian.hunter@...el.com, ulf.hansson@...aro.org,
        dianders@...omium.org
Cc:     linux-mmc@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-msm@...r.kernel.org,
        Veerabhadrarao Badiganti <vbadigan@...eaurora.org>,
        Andy Gross <agross@...nel.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>
Subject: [PATCH] mmc: sdhci-msm: Enable restore_dll_config flag for sc7180 target

On sc7180 target, issues are observed with HS400 mode due to a
hardware limitation. If sdcc clock is dynamically gated and ungated,
the very next command is failing with command CRC/timeout errors.

To mitigate this issue, DLL phase has to be restored whenever sdcc
clock is gated dynamically. The restore_dll_config ensures this.
Enabling this flag with this change. And simply re-using the sdm845
target configuration for this flag.

Signed-off-by: Veerabhadrarao Badiganti <vbadigan@...eaurora.org>
---
 drivers/mmc/host/sdhci-msm.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/mmc/host/sdhci-msm.c b/drivers/mmc/host/sdhci-msm.c
index 5a33389037cd..d4c02884cca8 100644
--- a/drivers/mmc/host/sdhci-msm.c
+++ b/drivers/mmc/host/sdhci-msm.c
@@ -2151,6 +2151,7 @@ static void sdhci_msm_dump_vendor_regs(struct sdhci_host *host)
 	{.compatible = "qcom,sdhci-msm-v5", .data = &sdhci_msm_v5_var},
 	{.compatible = "qcom,sdm845-sdhci", .data = &sdm845_sdhci_var},
 	{.compatible = "qcom,sm8250-sdhci", .data = &sm8250_sdhci_var},
+	{.compatible = "qcom,sc7180-sdhci", .data = &sdm845_sdhci_var},
 	{},
 };
 
-- 
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