sdhci: add ops to force delay in operations due to silicon issues

Commit Message

Philip Rakity Jan. 21, 2011, 7:30 p.m. UTC

None

Patch

diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c
index 6486009..ff9d5f0 100644
--- a/drivers/mmc/host/sdhci.c
+++ b/drivers/mmc/host/sdhci.c
@@ -922,6 +922,14 @@  static void sdhci_send_command(struct sdhci_host *host, struct mmc_command *cmd)
 		mdelay(1);
 	}
 
+	/*
+	 * we cannot talk to controller for 8 bus cycles according to sdio spec
+	 * at lowest speed this is 100,000 HZ per cycle or 800,000 cycles
+	 * which is quite a LONG TIME on a fast cpu -- so delay if needed
+	 */
+	if (host->ops->platform_specific_delay)
+		host->ops->platform_specific_delay(host);
+
 	mod_timer(&host->timer, jiffies + 10 * HZ);
 
 	host->cmd = cmd;
diff --git a/drivers/mmc/host/sdhci.h b/drivers/mmc/host/sdhci.h
index a8c43c9..91749dc 100644
--- a/drivers/mmc/host/sdhci.h
+++ b/drivers/mmc/host/sdhci.h
@@ -225,6 +225,7 @@  struct sdhci_ops {
 	void	(*platform_reset_enter)(struct sdhci_host *host, u8 mask);
 	void	(*platform_reset_exit)(struct sdhci_host *host, u8 mask);
 	unsigned int	(*get_f_max_clock)(struct sdhci_host *host);
+	void	(*platform_specific_delay)(struct sdhci_host *host);
 };
 
 #ifdef CONFIG_MMC_SDHCI_IO_ACCESSORS