linux-kernel - [v5 1/4] mmc: sdhci-cadence: Fix writing PHY delay

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Message-ID: <1490106736-2242-1-git-send-email-piotrs@cadence.com>
Date:   Tue, 21 Mar 2017 14:32:16 +0000
From:   Piotr Sroka <piotrs@...ence.com>
To:     <linux-mmc@...r.kernel.org>
CC:     Adrian Hunter <adrian.hunter@...el.com>,
        Ulf Hansson <ulf.hansson@...aro.org>,
        <linux-kernel@...r.kernel.org>,
        Masahiro Yamada <yamada.masahiro@...ionext.com>,
        Piotr Sroka <piotrs@...ence.com>
Subject: [v5 1/4] 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>
---
Changes for v2:
- fix indent
---
Changes for v3:
- none
---
Changes for v4:
- none
---
Changes for v5:
- use driver version from next branch, with applied enhanced strobe feature support.
---
 drivers/mmc/host/sdhci-cadence.c | 11 +++++++++--
 1 file changed, 9 insertions(+), 2 deletions(-)

diff --git a/drivers/mmc/host/sdhci-cadence.c b/drivers/mmc/host/sdhci-cadence.c
index 48f6419..83c3b55 100644
--- a/drivers/mmc/host/sdhci-cadence.c
+++ b/drivers/mmc/host/sdhci-cadence.c
@@ -68,11 +68,12 @@ struct sdhci_cdns_priv {
 	bool enhanced_strobe;
 };
 
-static void sdhci_cdns_write_phy_reg(struct sdhci_cdns_priv *priv,
-				     u8 addr, u8 data)
+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);
@@ -81,8 +82,14 @@ 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