[PATCH 4/7] mmc: sdhci: Add quirk for disabling DTO during erase command

Faiz Abbas
2019-01-11T11:08:48Z

Some controllers might prematurely issue a data timeout during an erase
command. Add a quirk to disable the interrupt when an erase command is
issued.

Signed-off-by: Faiz Abbas <faiz_abbas@ti.com>
---
drivers/mmc/host/sdhci.c | 8 ++++++++
drivers/mmc/host/sdhci.h | 2 ++
2 files changed, 10 insertions(+)

diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c
index 4a9044c06e21..cfd716aee552 100644
--- a/drivers/mmc/host/sdhci.c
+++ b/drivers/mmc/host/sdhci.c
@@ -1560,6 +1560,14 @@ void sdhci_send_command(struct sdhci_host *host, struct mmc_command *cmd)
/* Initially, a command has no error */
cmd->error = 0;

+ if (cmd->opcode == MMC_ERASE &&
+ (host->quirks2 & SDHCI_QUIRK2_DISABLE_DTO_FOR_ERASE)) {
+ mask = sdhci_readl(host, SDHCI_INT_ENABLE);
+ mask &= ~SDHCI_INT_DATA_TIMEOUT;
+ sdhci_writel(host, mask, SDHCI_INT_ENABLE);
+ sdhci_writel(host, mask, SDHCI_SIGNAL_ENABLE);
+ }
+
if ((host->quirks2 & SDHCI_QUIRK2_STOP_WITH_TC) &&
cmd->opcode == MMC_STOP_TRANSMISSION)
cmd->flags |= MMC_RSP_BUSY;
diff --git a/drivers/mmc/host/sdhci.h b/drivers/mmc/host/sdhci.h
index 7a52823ebef4..d0c6d4fe5371 100644
--- a/drivers/mmc/host/sdhci.h
+++ b/drivers/mmc/host/sdhci.h
@@ -479,6 +479,8 @@ struct sdhci_host {
* block count.
*/
#define SDHCI_QUIRK2_USE_32BIT_BLK_CNT (1<<18)
+/* Controller needs to disable DTO for erase command */
+#define SDHCI_QUIRK2_DISABLE_DTO_FOR_ERASE (1<<19)

int irq; /* Device IRQ */
void __iomem *ioaddr; /* Mapped address */
--
2.19.2