Add support for eMMC hardware reset for HID 80860F14.
Signed-off-by: Adrian Hunter <adrian.hunter@xxxxxxxxx>
---
drivers/mmc/host/sdhci-acpi.c | 28 +++++++++++++++++++++++++++-
1 file changed, 27 insertions(+), 1 deletion(-)
diff --git a/drivers/mmc/host/sdhci-acpi.c b/drivers/mmc/host/sdhci-acpi.c
index a51e603..baa579b 100644
--- a/drivers/mmc/host/sdhci-acpi.c
+++ b/drivers/mmc/host/sdhci-acpi.c
@@ -37,6 +37,7 @@
#include <linux/acpi_gpio.h>
#include <linux/pm.h>
#include <linux/pm_runtime.h>
+#include <linux/delay.h>
#include <linux/mmc/host.h>
#include <linux/mmc/pm.h>
@@ -85,12 +86,37 @@ static int sdhci_acpi_enable_dma(struct sdhci_host *host)
return 0;
}
+static void sdhci_acpi_int_hw_reset(struct sdhci_host *host)
+{
+ u8 reg;
+
+ reg = sdhci_readb(host, SDHCI_POWER_CONTROL);
+ reg |= 0x10;
+ sdhci_writeb(host, reg, SDHCI_POWER_CONTROL);
+ /* For eMMC, minimum is 1us but give it 9us for good measure */
+ udelay(9);
+ reg &= ~0x10;
+ sdhci_writeb(host, reg, SDHCI_POWER_CONTROL);
+ /* For eMMC, minimum is 200us but give it 300us for good measure */
+ usleep_range(300, 1000);
+}
+
static const struct sdhci_ops sdhci_acpi_ops_dflt = {
.enable_dma = sdhci_acpi_enable_dma,
};
+static const struct sdhci_ops sdhci_acpi_ops_int = {
+ .enable_dma = sdhci_acpi_enable_dma,
+ .hw_reset = sdhci_acpi_int_hw_reset,
+};
+
+static const struct sdhci_acpi_chip sdhci_acpi_chip_int = {
+ .ops = &sdhci_acpi_ops_int,
+};
+
static const struct sdhci_acpi_slot sdhci_acpi_slot_int_emmc = {
- .caps = MMC_CAP_8_BIT_DATA | MMC_CAP_NONREMOVABLE,
+ .chip = &sdhci_acpi_chip_int,
+ .caps = MMC_CAP_8_BIT_DATA | MMC_CAP_NONREMOVABLE | MMC_CAP_HW_RESET,
.caps2 = MMC_CAP2_HC_ERASE_SZ,
.flags = SDHCI_ACPI_RUNTIME_PM,
};
--
1.7.11.7
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