mmc: Add support for enumerating MMC card in a given mode using mmc command
Add support for enumerating MMC card in a given mode using mmc rescan and
mmc dev commands. The speed mode is provided as the last argument in these
commands and is indicated using the index from enum bus_mode in
include/mmc.h. A speed mode can be set only if it has already been enabled
in the device tree.
Signed-off-by: Aswath Govindraju <a-govindraju@ti.com>
Reviewed-by: Jaehoon Chung <jh80.chung@samsung.com>
Tested-by: Jaehoon Chung <jh80.chung@samsung.com>
diff --git a/drivers/mmc/mmc.c b/drivers/mmc/mmc.c
index 8078a89..bd34897 100644
--- a/drivers/mmc/mmc.c
+++ b/drivers/mmc/mmc.c
@@ -2862,7 +2862,25 @@
* timings.
*/
mmc->host_caps = mmc->cfg->host_caps | MMC_CAP(MMC_LEGACY) |
- MMC_CAP(MMC_LEGACY) | MMC_MODE_1BIT;
+ MMC_MODE_1BIT;
+
+ if (IS_ENABLED(CONFIG_MMC_SPEED_MODE_SET)) {
+ if (mmc->user_speed_mode != MMC_MODES_END) {
+ int i;
+ /* set host caps */
+ if (mmc->host_caps & MMC_CAP(mmc->user_speed_mode)) {
+ /* Remove all existing speed capabilities */
+ for (i = MMC_LEGACY; i < MMC_MODES_END; i++)
+ mmc->host_caps &= ~MMC_CAP(i);
+ mmc->host_caps |= (MMC_CAP(mmc->user_speed_mode)
+ | MMC_CAP(MMC_LEGACY) |
+ MMC_MODE_1BIT);
+ } else {
+ pr_err("bus_mode requested is not supported\n");
+ return -EINVAL;
+ }
+ }
+ }
#if CONFIG_IS_ENABLED(DM_MMC)
mmc_deferred_probe(mmc);
#endif
@@ -3060,6 +3078,8 @@
}
m = mmc_get_mmc_dev(dev);
+ m->user_speed_mode = MMC_MODES_END; /* Initialising user set speed mode */
+
if (!m)
return 0;
if (m->preinit)