Force host to have erase capacity to enable trim or discard feature in supported eMMC device.
Signed-off-by: Puthikorn Voravootivat <[email protected]> --- In mmc_init_queue() before setting up the discard function, mmc driver will call mmc_can_erase() which will always return 0 because the host erase capacity is not set anywhere. So to enable discard function, we need to add erase capacity to the host. drivers/mmc/host/dw_mmc.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/drivers/mmc/host/dw_mmc.c b/drivers/mmc/host/dw_mmc.c index 55cd110..f47f1c1 100644 --- a/drivers/mmc/host/dw_mmc.c +++ b/drivers/mmc/host/dw_mmc.c @@ -55,6 +55,8 @@ #define DW_MCI_FREQ_MAX 200000000 /* unit: HZ */ #define DW_MCI_FREQ_MIN 400000 /* unit: HZ */ +#define DW_MCI_DEFAULT_CAPS (MMC_CAP_ERASE) + #ifdef CONFIG_MMC_DW_IDMAC #define IDMAC_INT_CLR (SDMMC_IDMAC_INT_AI | SDMMC_IDMAC_INT_NI | \ SDMMC_IDMAC_INT_CES | SDMMC_IDMAC_INT_DU | \ @@ -2371,6 +2373,8 @@ static struct dw_mci_board *dw_mci_parse_dt(struct dw_mci *host) return ERR_PTR(-ENOMEM); } + pdata->caps |= DW_MCI_DEFAULT_CAPS; + /* find out number of slots supported */ if (of_property_read_u32(dev->of_node, "num-slots", &pdata->num_slots)) { -- 1.9.0.rc1.175.g0b1dcb5 -- To unsubscribe from this list: send the line "unsubscribe linux-mmc" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
