On Thu, Aug 24, 2023 at 03:59:39PM +0200, Ahmad Fatoum wrote: > barebox was observed to hang on an i.MX8MP while reading ext_csd from > a broken eMMC that even bootROM refused to boot from. For PIO, we > already have a maximum wait time of 10s. Do the same for DMA. > > It's unlikely that in that state any further communication with the card > will work, but at least, the system isn't stuck and the shell can be > reached. The reset is done on the off-chance that the DMA would've completed > after the 10s and corrupted memory if not disabled. > > Signed-off-by: Ahmad Fatoum <a.fatoum@xxxxxxxxxxxxxx> > --- > drivers/mci/sdhci.c | 10 ++++++++++ > 1 file changed, 10 insertions(+) Applied, thanks Sascha > > diff --git a/drivers/mci/sdhci.c b/drivers/mci/sdhci.c > index b0b83bfaa9a7..9829a78cb6c5 100644 > --- a/drivers/mci/sdhci.c > +++ b/drivers/mci/sdhci.c > @@ -252,6 +252,7 @@ int sdhci_transfer_data_dma(struct sdhci *sdhci, struct mci_data *data, > dma_addr_t dma) > { > struct device *dev = sdhci->mci->hw_dev; > + u64 start; > int nbytes; > u32 irqstat; > int ret; > @@ -261,6 +262,8 @@ int sdhci_transfer_data_dma(struct sdhci *sdhci, struct mci_data *data, > > nbytes = data->blocks * data->blocksize; > > + start = get_time_ns(); > + > do { > irqstat = sdhci_read32(sdhci, SDHCI_INT_STATUS); > > @@ -304,6 +307,13 @@ int sdhci_transfer_data_dma(struct sdhci *sdhci, struct mci_data *data, > > if (irqstat & SDHCI_INT_XFER_COMPLETE) > break; > + > + if (is_timeout(start, 10 * SECOND)) { > + dev_alert(dev, "DMA wait timed out. Resetting, but recovery unlikely\n"); > + sdhci_reset(sdhci, SDHCI_RESET_ALL); > + ret = -ETIMEDOUT; > + goto out; > + } > } while (1); > > ret = 0; > -- > 2.39.2 > > > -- Pengutronix e.K. | | Steuerwalder Str. 21 | http://www.pengutronix.de/ | 31137 Hildesheim, Germany | Phone: +49-5121-206917-0 | Amtsgericht Hildesheim, HRA 2686 | Fax: +49-5121-206917-5555 |