ACMD21 was extended to support the host-card handshake during
initialization. The card expects that the HCS & HO2T bits to be set in
the command argument, and sets the applicable bits in the R3 returned
response. On the contrary, if a SDUC card is inserted to a
non-supporting host, it will never respond to this ACMD21 until
eventually, the host will timed out and give up.
Signed-off-by: Avri Altman <avri.altman@xxxxxxx>
---
drivers/mmc/core/sd_ops.c | 19 +++++++++++++++----
include/linux/mmc/host.h | 6 ++++++
include/linux/mmc/sd.h | 1 +
3 files changed, 22 insertions(+), 4 deletions(-)
diff --git a/drivers/mmc/core/sd_ops.c b/drivers/mmc/core/sd_ops.c
index 8b9b34286ef3..7f6963dac873 100644
--- a/drivers/mmc/core/sd_ops.c
+++ b/drivers/mmc/core/sd_ops.c
@@ -168,12 +168,16 @@ int mmc_send_app_op_cond(struct mmc_host *host, u32 ocr, u32 *rocr)
.cmd = &cmd
};
int err;
+ u32 sduc_arg = SD_OCR_CCS | SD_OCR_2T;
cmd.opcode = SD_APP_OP_COND;
+ cmd.arg = ocr;
+
if (mmc_host_is_spi(host))
- cmd.arg = ocr & (1 << 30); /* SPI only defines one bit */
+ cmd.arg &= (1 << 30); /* SPI only defines one bit */
else
- cmd.arg = ocr;
+ cmd.arg |= sduc_arg;
+
cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R3 | MMC_CMD_BCR;
err = __mmc_poll_for_busy(host, SD_APP_OP_COND_PERIOD_US,
@@ -182,8 +186,15 @@ int mmc_send_app_op_cond(struct mmc_host *host, u32 ocr, u32 *rocr)
if (err)
return err;
- if (rocr && !mmc_host_is_spi(host))
- *rocr = cmd.resp[0];
+ if (!mmc_host_is_spi(host)) {
+ if (rocr)
+ *rocr = cmd.resp[0];
+
+ if ((cmd.resp[0] & sduc_arg) == sduc_arg)
+ host->caps2 |= MMC_CAP2_SD_SDUC;
+ else
+ host->caps2 &= ~MMC_CAP2_SD_SDUC;
+ }
return 0;
}
diff --git a/include/linux/mmc/host.h b/include/linux/mmc/host.h
index 88c6a76042ee..a9c36a3e1a10 100644
--- a/include/linux/mmc/host.h
+++ b/include/linux/mmc/host.h
@@ -427,6 +427,7 @@ struct mmc_host {
#define MMC_CAP2_CRYPTO 0
#endif
#define MMC_CAP2_ALT_GPT_TEGRA (1 << 28) /* Host with eMMC that has GPT entry at a non-standard location */
+#define MMC_CAP2_SD_SDUC (1 << 29) /* SD over 2TB */
int fixed_drv_type; /* fixed driver type for non-removable media */
@@ -638,6 +639,11 @@ static inline int mmc_card_uhs(struct mmc_card *card)
card->host->ios.timing <= MMC_TIMING_UHS_DDR50;
}
+static inline int mmc_card_is_sduc(struct mmc_host *host)
+{
+ return host->caps2 & MMC_CAP2_SD_SDUC;
+}
+
void mmc_retune_timer_stop(struct mmc_host *host);
static inline void mmc_retune_needed(struct mmc_host *host)
diff --git a/include/linux/mmc/sd.h b/include/linux/mmc/sd.h
index 6727576a8755..865cc0ca8543 100644
--- a/include/linux/mmc/sd.h
+++ b/include/linux/mmc/sd.h
@@ -36,6 +36,7 @@
/* OCR bit definitions */
#define SD_OCR_S18R (1 << 24) /* 1.8V switching request */
#define SD_ROCR_S18A SD_OCR_S18R /* 1.8V switching accepted by card */
+#define SD_OCR_2T (1 << 27) /* HO2T/CO2T - SDUC support */
#define SD_OCR_XPC (1 << 28) /* SDXC power control */
#define SD_OCR_CCS (1 << 30) /* Card Capacity Status */
--
2.25.1
