linux-kernel - [PATCH 1/2] [1/2] mmc: sdhci-cadence: Fix writing PHY delay

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Message-ID: <1487250413-5769-1-git-send-email-piotrs@cadence.com>
Date:   Thu, 16 Feb 2017 13:06:52 +0000
From:   Piotr Sroka <piotrs@...ence.com>
To:     <linux-mmc@...r.kernel.org>
CC:     Ulf Hansson <ulf.hansson@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Adrian Hunter <adrian.hunter@...el.com>,
        <linux-kernel@...r.kernel.org>, <devicetree@...r.kernel.org>,
        Piotr Sroka <piotrs@...ence.com>
Subject: [PATCH 1/2] [1/2] mmc: sdhci-cadence: Fix writing PHY delay

Add polling for ACK to be sure that data are written to PHY register.

Signed-off-by: Piotr Sroka <piotrs@...ence.com>
---
 drivers/mmc/host/sdhci-cadence.c | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/drivers/mmc/host/sdhci-cadence.c b/drivers/mmc/host/sdhci-cadence.c
index 4b0ecb9..c946e45 100644
--- a/drivers/mmc/host/sdhci-cadence.c
+++ b/drivers/mmc/host/sdhci-cadence.c
@@ -65,11 +65,12 @@ struct sdhci_cdns_priv {
 	void __iomem *hrs_addr;
 };
 
-static void sdhci_cdns_write_phy_reg(struct sdhci_cdns_priv *priv,
+static int sdhci_cdns_write_phy_reg(struct sdhci_cdns_priv *priv,
 				     u8 addr, u8 data)
 {
 	void __iomem *reg = priv->hrs_addr + SDHCI_CDNS_HRS04;
 	u32 tmp;
+	int ret;
 
 	tmp = (data << SDHCI_CDNS_HRS04_WDATA_SHIFT) |
 	      (addr << SDHCI_CDNS_HRS04_ADDR_SHIFT);
@@ -78,8 +79,14 @@ static void sdhci_cdns_write_phy_reg(struct sdhci_cdns_priv *priv,
 	tmp |= SDHCI_CDNS_HRS04_WR;
 	writel(tmp, reg);
 
+	ret = readl_poll_timeout(reg, tmp, tmp & SDHCI_CDNS_HRS04_ACK, 0, 10);
+	if (ret)
+		return ret;
+
 	tmp &= ~SDHCI_CDNS_HRS04_WR;
 	writel(tmp, reg);
+
+	return 0;
 }
 
 static void sdhci_cdns_phy_init(struct sdhci_cdns_priv *priv)
-- 
2.2.2