Currently sdhci-arasan 5.1 can support enhanced strobe function,
and we now limit it just for "arasan,sdhci-5.1". Add
mmc-hs400-enhanced-strobe in DT to enable the function if we'r sure
our controller can support it.
Signed-off-by: Shawn Lin <shawn.lin@xxxxxxxxxxxxxx>
---
Changes in v2: None
drivers/mmc/host/sdhci-of-arasan.c | 22 ++++++++++++++++++++++
1 file changed, 22 insertions(+)
diff --git a/drivers/mmc/host/sdhci-of-arasan.c b/drivers/mmc/host/sdhci-of-arasan.c
index 20b859e..a0e4536 100644
--- a/drivers/mmc/host/sdhci-of-arasan.c
+++ b/drivers/mmc/host/sdhci-of-arasan.c
@@ -25,7 +25,9 @@
#include "sdhci-pltfm.h"
#define SDHCI_ARASAN_CLK_CTRL_OFFSET 0x2c
+#define SDHCI_ARASAN_VENDOR_REGISTER 0x78
+#define VENDOR_ENHANCED_STROBE BIT(0)
#define CLK_CTRL_TIMEOUT_SHIFT 16
#define CLK_CTRL_TIMEOUT_MASK (0xf << CLK_CTRL_TIMEOUT_SHIFT)
#define CLK_CTRL_TIMEOUT_MIN_EXP 13
@@ -73,6 +75,23 @@ static void sdhci_arasan_set_clock(struct sdhci_host *host, unsigned int clock)
phy_power_on(sdhci_arasan->phy);
}
+static int sdhci_arasan_enhanced_strobe(struct mmc_host *mmc,
+ bool enable)
+{
+ u32 vendor;
+ struct sdhci_host *host = mmc_priv(mmc);
+
+ vendor = readl(host->ioaddr + SDHCI_ARASAN_VENDOR_REGISTER);
+ if (enable)
+ vendor |= VENDOR_ENHANCED_STROBE;
+ else
+ vendor &= (~VENDOR_ENHANCED_STROBE);
+
+ writel(vendor, host->ioaddr + SDHCI_ARASAN_VENDOR_REGISTER);
+
+ return 0;
+}
+
static struct sdhci_ops sdhci_arasan_ops = {
.set_clock = sdhci_arasan_set_clock,
.get_max_clock = sdhci_pltfm_clk_get_max_clock,
@@ -239,6 +258,9 @@ static int sdhci_arasan_probe(struct platform_device *pdev)
dev_err(&pdev->dev, "phy_power_on err.\n");
goto err_phy_power;
}
+
+ host->mmc_host_ops.prepare_enhanced_strobe =
+ sdhci_arasan_enhanced_strobe;
}
ret = sdhci_add_host(host);
--
2.3.7
--
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