On 8/04/24 22:52, Hans de Goede wrote:
> Unlike all other Bay Trail devices I have (quite a few) the BIOS on
> the Lenovo Yoga Tablet 2 830 / 1050 and Lenovo Yoga Tablet 2 Pro 1380 (8",
> 10" and 13") models sets the SDHCI_SUPPORT_DDR50 bit in the sdcard slots'
> SDHCI controller's Caps_1 register which causes Linux to try and use
> UHS SDR12 / SDR25 and DDR50 modes on UHS cards.
>
> These tablets do have 1.8V signalling implemented in the hw level through
> the Bay Trail SoC's SD3_1P8EN pin. But trying to use UHS modes leads to
> lots of errors like these:
>
> [ 225.272001] mmc2: Unexpected interrupt 0x04000000.
> [ 225.272024] mmc2: sdhci: ============ SDHCI REGISTER DUMP ===========
> [ 225.272034] mmc2: sdhci: Sys addr: 0x0712c400 | Version: 0x0000b502
> [ 225.272044] mmc2: sdhci: Blk size: 0x00007200 | Blk cnt: 0x00000007
> [ 225.272054] mmc2: sdhci: Argument: 0x00000000 | Trn mode: 0x00000023
> [ 225.272064] mmc2: sdhci: Present: 0x01e20002 | Host ctl: 0x00000016
> [ 225.272073] mmc2: sdhci: Power: 0x0000000f | Blk gap: 0x00000000
> [ 225.272082] mmc2: sdhci: Wake-up: 0x00000000 | Clock: 0x00000107
> [ 225.272092] mmc2: sdhci: Timeout: 0x0000000e | Int stat: 0x00000001
> [ 225.272101] mmc2: sdhci: Int enab: 0x03ff000b | Sig enab: 0x03ff000b
> [ 225.272110] mmc2: sdhci: ACmd stat: 0x00000000 | Slot int: 0x00000001
> [ 225.272119] mmc2: sdhci: Caps: 0x076864b2 | Caps_1: 0x00000004
> [ 225.272129] mmc2: sdhci: Cmd: 0x00000c1b | Max curr: 0x00000000
> [ 225.272138] mmc2: sdhci: Resp[0]: 0x00000c00 | Resp[1]: 0x00000000
> [ 225.272147] mmc2: sdhci: Resp[2]: 0x00000000 | Resp[3]: 0x00000900
> [ 225.272155] mmc2: sdhci: Host ctl2: 0x0000000c
> [ 225.272164] mmc2: sdhci: ADMA Err: 0x00000003 | ADMA Ptr: 0x0712c200
> [ 225.272172] mmc2: sdhci: ============================================
>
0x04000000 is so-called "Tuning Error" which oddly the SDHCI driver
does not support / enable.
Could try making the IRQ handler process it and see if that helps:
diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c
index c79f73459915..746f4cf7ab03 100644
--- a/drivers/mmc/host/sdhci.c
+++ b/drivers/mmc/host/sdhci.c
@@ -3439,12 +3439,18 @@ static void sdhci_data_irq(struct sdhci_host *host, u32 intmask)
host->data->error = -EILSEQ;
if (!mmc_op_tuning(SDHCI_GET_CMD(sdhci_readw(host, SDHCI_COMMAND))))
sdhci_err_stats_inc(host, DAT_CRC);
- } else if ((intmask & SDHCI_INT_DATA_CRC) &&
+ } else if ((intmask & (SDHCI_INT_DATA_CRC | SDHCI_INT_TUNING_ERROR)) &&
SDHCI_GET_CMD(sdhci_readw(host, SDHCI_COMMAND))
!= MMC_BUS_TEST_R) {
host->data->error = -EILSEQ;
if (!mmc_op_tuning(SDHCI_GET_CMD(sdhci_readw(host, SDHCI_COMMAND))))
sdhci_err_stats_inc(host, DAT_CRC);
+ if (intmask & SDHCI_INT_TUNING_ERROR) {
+ u16 ctrl2 = sdhci_readw(host, SDHCI_HOST_CONTROL2);
+
+ ctrl2 &= ~SDHCI_CTRL_TUNED_CLK;
+ sdhci_writew(host, ctrl2, SDHCI_HOST_CONTROL2);
+ }
} else if (intmask & SDHCI_INT_ADMA_ERROR) {
pr_err("%s: ADMA error: 0x%08x\n", mmc_hostname(host->mmc),
intmask);
@@ -3979,7 +3985,7 @@ bool sdhci_cqe_irq(struct sdhci_host *host, u32 intmask, int *cmd_error,
} else
*cmd_error = 0;
- if (intmask & (SDHCI_INT_DATA_END_BIT | SDHCI_INT_DATA_CRC)) {
+ if (intmask & (SDHCI_INT_DATA_END_BIT | SDHCI_INT_DATA_CRC | SDHCI_INT_TUNING_ERROR)) {
*data_error = -EILSEQ;
if (!mmc_op_tuning(SDHCI_GET_CMD(sdhci_readw(host, SDHCI_COMMAND))))
sdhci_err_stats_inc(host, DAT_CRC);
diff --git a/drivers/mmc/host/sdhci.h b/drivers/mmc/host/sdhci.h
index a20864fc0641..957c7a917ffb 100644
--- a/drivers/mmc/host/sdhci.h
+++ b/drivers/mmc/host/sdhci.h
@@ -158,6 +158,7 @@
#define SDHCI_INT_BUS_POWER 0x00800000
#define SDHCI_INT_AUTO_CMD_ERR 0x01000000
#define SDHCI_INT_ADMA_ERROR 0x02000000
+#define SDHCI_INT_TUNING_ERROR 0x04000000
#define SDHCI_INT_NORMAL_MASK 0x00007FFF
#define SDHCI_INT_ERROR_MASK 0xFFFF8000
@@ -169,7 +170,7 @@
SDHCI_INT_DATA_AVAIL | SDHCI_INT_SPACE_AVAIL | \
SDHCI_INT_DATA_TIMEOUT | SDHCI_INT_DATA_CRC | \
SDHCI_INT_DATA_END_BIT | SDHCI_INT_ADMA_ERROR | \
- SDHCI_INT_BLK_GAP)
+ SDHCI_INT_BLK_GAP | SDHCI_INT_TUNING_ERROR)
#define SDHCI_INT_ALL_MASK ((unsigned int)-1)
#define SDHCI_CQE_INT_ERR_MASK ( \
