mmc: sd: report correct speed and capacity of uhs cards
Since only UHS-I cards respond with S18A set in response to ACMD41,
we set the card as ultra-high-speed after successfull initialization.
We need to decide whether a card is SDXC based on the C_SIZE field
of CSDv2.0 register. According to Physical Layer spec v3.01, the
minimum value of C_SIZE for SDXC card is 00FFFFh.
Tested by Zhangfei Gao with a Toshiba uhs card and general hs card,
on mmp2 in SDMA mode.
Signed-off-by: Arindam Nath <arindam.nath@amd.com>
Reviewed-by: Philip Rakity <prakity@marvell.com>
Tested-by: Philip Rakity <prakity@marvell.com>
Acked-by: Zhangfei Gao <zhangfei.gao@marvell.com>
Signed-off-by: Chris Ball <cjb@laptop.org>
diff --git a/drivers/mmc/core/sd.c b/drivers/mmc/core/sd.c
index 8e2d801..732c317 100644
--- a/drivers/mmc/core/sd.c
+++ b/drivers/mmc/core/sd.c
@@ -130,7 +130,7 @@
break;
case 1:
/*
- * This is a block-addressed SDHC card. Most
+ * This is a block-addressed SDHC or SDXC card. Most
* interesting fields are unused and have fixed
* values. To avoid getting tripped by buggy cards,
* we assume those fixed values ourselves.
@@ -144,6 +144,11 @@
e = UNSTUFF_BITS(resp, 96, 3);
csd->max_dtr = tran_exp[e] * tran_mant[m];
csd->cmdclass = UNSTUFF_BITS(resp, 84, 12);
+ csd->c_size = UNSTUFF_BITS(resp, 48, 22);
+
+ /* SDXC cards have a minimum C_SIZE of 0x00FFFF */
+ if (csd->c_size >= 0xFFFF)
+ mmc_card_set_ext_capacity(card);
m = UNSTUFF_BITS(resp, 48, 22);
csd->capacity = (1 + m) << 10;
@@ -911,6 +916,9 @@
err = mmc_sd_init_uhs_card(card);
if (err)
goto free_card;
+
+ /* Card is an ultra-high-speed card */
+ mmc_sd_card_set_uhs(card);
} else {
/*
* Attempt to change to high-speed (if supported)
