MMC: AU1xMMC: Allow platforms to disable host capabilities
Although the hardware supports a 4/8bit SD interface and the driver
unconditionally advertises all hardware caps to the MMC core, not all
datalines may actually be wired up. This patch introduces another
field to au1xmmc platform data allowing platforms to disable certain
advanced host controller features.
Signed-off-by: Manuel Lauss <manuel.lauss@gmail.com>
To: linux-mmc@vger.kernel.org
CC: Linux-MIPS <linux-mips@linux-mips.org>
Patchwork: http://patchwork.linux-mips.org/patch/460/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
diff --git a/arch/mips/include/asm/mach-au1x00/au1100_mmc.h b/arch/mips/include/asm/mach-au1x00/au1100_mmc.h
index 58fbe17..94000a3 100644
--- a/arch/mips/include/asm/mach-au1x00/au1100_mmc.h
+++ b/arch/mips/include/asm/mach-au1x00/au1100_mmc.h
@@ -46,6 +46,7 @@
int(*card_readonly)(void *mmc_host);
void(*set_power)(void *mmc_host, int state);
struct led_classdev *led;
+ unsigned long mask_host_caps;
};
#define SD0_BASE 0xB0600000
diff --git a/drivers/mmc/host/au1xmmc.c b/drivers/mmc/host/au1xmmc.c
index c8649df..57b2119 100644
--- a/drivers/mmc/host/au1xmmc.c
+++ b/drivers/mmc/host/au1xmmc.c
@@ -1017,6 +1017,10 @@
} else
mmc->caps |= MMC_CAP_NEEDS_POLL;
+ /* platform may not be able to use all advertised caps */
+ if (host->platdata)
+ mmc->caps &= ~(host->platdata->mask_host_caps);
+
tasklet_init(&host->data_task, au1xmmc_tasklet_data,
(unsigned long)host);