[RFC PATCH 3/3] mmc: sdhci: Add more debug info in case of data error

Ritesh Harjani
2016-12-30T11:32:11Z

print error log message and dump sdhc registers for debugging
purpose in case of data errors (except when tuning commands
generate CRC/timeout/end bit errors).

Signed-off-by: Ritesh Harjani <riteshh@codeaurora.org>
---
drivers/mmc/host/sdhci.c | 21 +++++++++++++++++++--
1 file changed, 19 insertions(+), 2 deletions(-)

diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c
index 73a8918..2e51e49 100644
--- a/drivers/mmc/host/sdhci.c
+++ b/drivers/mmc/host/sdhci.c
@@ -2616,9 +2616,26 @@ static void sdhci_data_irq(struct sdhci_host *host, u32 intmask)
host->ops->adma_workaround(host, intmask);
}

- if (host->data->error)
+ if (host->data->error) {
+ bool pr_msg = true;
+
+ if (intmask & (SDHCI_INT_DATA_CRC | SDHCI_INT_DATA_TIMEOUT |
+ SDHCI_INT_DATA_END_BIT)) {
+ command = SDHCI_GET_CMD(sdhci_readw(host,
+ SDHCI_COMMAND));
+ if (command == MMC_SEND_TUNING_BLOCK_HS200 ||
+ command == MMC_SEND_TUNING_BLOCK)
+ pr_msg = false;
+ }
+ if (pr_msg) {
+ pr_err("%s: data txfr (0x%08x) error: %d\n",
+ mmc_hostname(host->mmc), intmask,
+ host->data->error);
+ sdhci_dumpregs(host);
+ }
+
sdhci_finish_data(host);
- else {
+ } else {
if (intmask & (SDHCI_INT_DATA_AVAIL | SDHCI_INT_SPACE_AVAIL))
sdhci_transfer_pio(host);

--
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