[PATCH v1 2/7] mci: sdhci: bail out on ADMA/transfer errors instead of hanging

[Johannes Schneider <johannes.schneider@leica-geosystems.com>]

sdhci_transfer_data_dma() only watched for the completion and DMA-boundary
interrupts, so a transfer/ADMA error (SDHCI_INT_ERROR, e.g. an ADMA
descriptor fault) left it spinning until the 10s timeout. Check the error
bits and abort the transfer with -EIO, dumping the ADMA error status.

Assisted-by: Claude Opus 4.8 (1M context)
Signed-off-by: Johannes Schneider <johannes.schneider@leica-geosystems.com>
---
 drivers/mci/sdhci.c | 8 ++++++++
 drivers/mci/sdhci.h | 1 +
 2 files changed, 9 insertions(+)

diff --git a/drivers/mci/sdhci.c b/drivers/mci/sdhci.c
index 3474ef129b..ccd5d4b83c 100644
--- a/drivers/mci/sdhci.c
+++ b/drivers/mci/sdhci.c
@@ -779,6 +779,14 @@ int sdhci_transfer_data_dma(struct sdhci *sdhci, struct mci_cmd *cmd,
 			goto out;
 		}
 
+		/* e.g. ADMA error: SDHCI_INT_ERROR without a data-error bit */
+		if (irqstat & SDHCI_INT_ERROR) {
+			dev_err(dev, "transfer error: int 0x%08x adma 0x%02x\n",
+				irqstat, sdhci_read8(sdhci, SDHCI_ADMA_ERROR));
+			ret = -EIO;
+			goto out;
+		}
+
 		/*
 		 * We currently don't do anything fancy with DMA
 		 * boundaries, but as we can't disable the feature
diff --git a/drivers/mci/sdhci.h b/drivers/mci/sdhci.h
index d1f05ac968..558469e8ab 100644
--- a/drivers/mci/sdhci.h
+++ b/drivers/mci/sdhci.h
@@ -111,6 +111,7 @@
 #define  SDHCI_RESET_DATA			BIT(2)
 #define SDHCI_INT_STATUS					0x30
 #define SDHCI_INT_NORMAL_STATUS					0x30
+#define  SDHCI_INT_ADMA_ERROR			BIT(25)
 #define  SDHCI_INT_DATA_END_BIT			BIT(22)
 #define  SDHCI_INT_DATA_CRC			BIT(21)
 #define  SDHCI_INT_DATA_TIMEOUT			BIT(20)
-- 
2.43.0