Force host to have erase capacity to enable trim or
discard feature in supported eMMC device.
Signed-off-by: Puthikorn Voravootivat <puthik@xxxxxxxxxxxx>
---
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
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