mmc: core: add high-capacity erase size capability flag

Let drivers specify the use of high-capacity erase size.

Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Signed-off-by: Chris Ball <cjb@laptop.org>

diff --git a/drivers/mmc/core/mmc.c b/drivers/mmc/core/mmc.c
index d7d8a93..02914d6 100644 (file)
--- a/drivers/mmc/core/mmc.c
+++ b/drivers/mmc/core/mmc.c
@@ -952,7 +952,8 @@ static int mmc_init_card(struct mmc_host *host, u32 ocr,
         * If enhanced_area_en is TRUE, host needs to enable ERASE_GRP_DEF
         * bit.  This bit will be lost every time after a reset or power off.
         */
-       if (card->ext_csd.enhanced_area_en) {
+       if (card->ext_csd.enhanced_area_en ||
+           (card->ext_csd.rev >= 3 && (host->caps2 & MMC_CAP2_HC_ERASE_SZ))) {
                err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
                                 EXT_CSD_ERASE_GROUP_DEF, 1,
                                 card->ext_csd.generic_cmd6_time);

diff --git a/include/linux/mmc/host.h b/include/linux/mmc/host.h
index e05bd24..33a4d08 100644 (file)
--- a/include/linux/mmc/host.h
+++ b/include/linux/mmc/host.h
@@ -236,6 +236,7 @@ struct mmc_host {
                                 MMC_CAP2_HS200_1_2V_SDR)
 #define MMC_CAP2_BROKEN_VOLTAGE        (1 << 7)        /* Use the broken voltage */
 #define MMC_CAP2_DETECT_ON_ERR (1 << 8)        /* On I/O err check card removal */
+#define MMC_CAP2_HC_ERASE_SZ   (1 << 9)        /* High-capacity erase size */
 
        mmc_pm_flag_t           pm_caps;        /* supported pm features */
        unsigned int        power_notify_type;