[PATCH RFC 1/8] mmc: sdhci-msm: Reset vendor specific func register on probe

[Ritesh Harjani <riteshh@codeaurora.org>]

From: Venkat Gopalakrishnan <venkatg@codeaurora.org>

The vendor specific func register doesn't get reset when using the
software reset register. The various bootloader's could leave this
in an unknown state, hence reset this register to it's power on reset
value during probe.

Signed-off-by: Venkat Gopalakrishnan <venkatg@codeaurora.org>
Signed-off-by: Ritesh Harjani <riteshh@codeaurora.org>
---
 drivers/mmc/host/sdhci-msm.c | 15 ++++-----------
 1 file changed, 4 insertions(+), 11 deletions(-)

diff --git a/drivers/mmc/host/sdhci-msm.c b/drivers/mmc/host/sdhci-msm.c
index 0653fe7..6e56f2b 100644
--- a/drivers/mmc/host/sdhci-msm.c
+++ b/drivers/mmc/host/sdhci-msm.c
@@ -45,6 +45,7 @@
 
 #define CORE_VENDOR_SPEC	0x10c
 #define CORE_CLK_PWRSAVE	BIT(1)
+#define CORE_VENDOR_SPEC_POR_VAL	0xa1c
 
 #define CORE_VENDOR_SPEC_CAPABILITIES0	0x11c
 
@@ -507,17 +508,9 @@ static int sdhci_msm_probe(struct platform_device *pdev)
 		goto clk_disable;
 	}
 
-	/* Reset the core and Enable SDHC mode */
-	writel_relaxed(readl_relaxed(msm_host->core_mem + CORE_POWER) |
-		       CORE_SW_RST, msm_host->core_mem + CORE_POWER);
-
-	/* SW reset can take upto 10HCLK + 15MCLK cycles. (min 40us) */
-	usleep_range(1000, 5000);
-	if (readl(msm_host->core_mem + CORE_POWER) & CORE_SW_RST) {
-		dev_err(&pdev->dev, "Stuck in reset\n");
-		ret = -ETIMEDOUT;
-		goto clk_disable;
-	}
+	/* Reset the vendor spec register to power on reset state. */
+	writel_relaxed(CORE_VENDOR_SPEC_POR_VAL,
+			host->ioaddr + CORE_VENDOR_SPEC);
 
 	/* Set HC_MODE_EN bit in HC_MODE register */
 	writel_relaxed(HC_MODE_EN, (msm_host->core_mem + CORE_HC_MODE));
-- 
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