[PATCH 3/6] mmc: sdhci: add platform set_timeout hook

[Dong Aisheng <b29396@freescale.com>]

Currently the common code assume 0xE is the maximum timeout counter
value and use it to write into the timeout counter register.
However, it's fairly possible that the different SoCs may have
different register layout on the timeout counter register.
That means 0xE may not be the correct maximum timeout value, then
the 0xE becomes meaningless.

To be flexible, this patch provides another approach for platforms
to set the correct timeout on their way.

Signed-off-by: Dong Aisheng <b29396@freescale.com>
---
 drivers/mmc/host/sdhci.c |   19 ++++++++++++++-----
 drivers/mmc/host/sdhci.h |    2 ++
 2 files changed, 16 insertions(+), 5 deletions(-)

diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c
index 464d42c..4cc3bd6 100644
--- a/drivers/mmc/host/sdhci.c
+++ b/drivers/mmc/host/sdhci.c
@@ -726,19 +726,28 @@ static void sdhci_set_transfer_irqs(struct sdhci_host *host)
 		sdhci_clear_set_irqs(host, dma_irqs, pio_irqs);
 }
 
-static void sdhci_prepare_data(struct sdhci_host *host, struct mmc_command *cmd)
+static void sdhci_set_timeout(struct sdhci_host *host, struct mmc_command *cmd)
 {
 	u8 count;
+
+	if (host->ops->set_timeout) {
+		host->ops->set_timeout(host, cmd);
+	} else {
+		count = sdhci_calc_timeout(host, cmd);
+		sdhci_writeb(host, count, SDHCI_TIMEOUT_CONTROL);
+	}
+}
+
+static void sdhci_prepare_data(struct sdhci_host *host, struct mmc_command *cmd)
+{
 	u8 ctrl;
 	struct mmc_data *data = cmd->data;
 	int ret;
 
 	WARN_ON(host->data);
 
-	if (data || (cmd->flags & MMC_RSP_BUSY)) {
-		count = sdhci_calc_timeout(host, cmd);
-		sdhci_writeb(host, count, SDHCI_TIMEOUT_CONTROL);
-	}
+	if (data || (cmd->flags & MMC_RSP_BUSY))
+		sdhci_set_timeout(host, cmd);
 
 	if (!data)
 		return;
diff --git a/drivers/mmc/host/sdhci.h b/drivers/mmc/host/sdhci.h
index 1591cbb..a4851a0 100644
--- a/drivers/mmc/host/sdhci.h
+++ b/drivers/mmc/host/sdhci.h
@@ -282,6 +282,8 @@ struct sdhci_ops {
 	unsigned int	(*get_min_clock)(struct sdhci_host *host);
 	unsigned int	(*get_timeout_clock)(struct sdhci_host *host);
 	unsigned int	(*get_max_timeout)(struct sdhci_host *host);
+	void		(*set_timeout)(struct sdhci_host *host,
+						struct mmc_command *cmd);
 	int		(*platform_bus_width)(struct sdhci_host *host,
 					       int width);
 	void (*platform_send_init_74_clocks)(struct sdhci_host *host,
-- 
1.7.2.rc3