This patch defines a quirk to do a callback when
switching voltages so do controller-specific
actions.
It is a preparation and will be used by Fujitsu
SDHCI controller f_sdh30 driver.
Signed-off-by: Vincent Yang <Vincent.Yang@xxxxxxxxxxxxxx>
---
drivers/mmc/host/sdhci.c | 5 +++++
drivers/mmc/host/sdhci.h | 1 +
include/linux/mmc/sdhci.h | 2 ++
3 files changed, 8 insertions(+)
diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c
index 523075f..98d996f 100644
--- a/drivers/mmc/host/sdhci.c
+++ b/drivers/mmc/host/sdhci.c
@@ -1763,6 +1763,11 @@ static int sdhci_do_start_signal_voltage_switch(struct sdhci_host *host,
ctrl |= SDHCI_CTRL_VDD_180;
sdhci_writew(host, ctrl, SDHCI_HOST_CONTROL2);
+ /* Some controller need to do more when switching */
+ if ((host->quirks2 & SDHCI_QUIRK2_VOLTAGE_SWITCH) &&
+ host->ops->voltage_switch)
+ host->ops->voltage_switch(host);
+
/* Wait for 5ms */
usleep_range(5000, 5500);
diff --git a/drivers/mmc/host/sdhci.h b/drivers/mmc/host/sdhci.h
index 4a5cd5e..63c7a46 100644
--- a/drivers/mmc/host/sdhci.h
+++ b/drivers/mmc/host/sdhci.h
@@ -292,6 +292,7 @@ struct sdhci_ops {
void (*adma_workaround)(struct sdhci_host *host, u32 intmask);
void (*platform_init)(struct sdhci_host *host);
void (*card_event)(struct sdhci_host *host);
+ void (*voltage_switch)(struct sdhci_host *host);
};
#ifdef CONFIG_MMC_SDHCI_IO_ACCESSORS
diff --git a/include/linux/mmc/sdhci.h b/include/linux/mmc/sdhci.h
index cac0958..13ab139 100644
--- a/include/linux/mmc/sdhci.h
+++ b/include/linux/mmc/sdhci.h
@@ -100,6 +100,8 @@ struct sdhci_host {
#define SDHCI_QUIRK2_BROKEN_DDR50 (1<<7)
/* The system physically doesn't support 3.0v, even if the host does */
#define SDHCI_QUIRK2_NO_3_0_V (1<<8)
+/* Do a callback when switching voltages so do controller-specific actions */
+#define SDHCI_QUIRK2_VOLTAGE_SWITCH (1<<9)
int irq; /* Device IRQ */
void __iomem *ioaddr; /* Mapped address */
--
1.9.0
--
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