diff options
| -rw-r--r-- | drivers/mmc/sunxi_mmc.c | 10 |
1 files changed, 7 insertions, 3 deletions
diff --git a/drivers/mmc/sunxi_mmc.c b/drivers/mmc/sunxi_mmc.c index 178b8cf106..aaab0cf866 100644 --- a/drivers/mmc/sunxi_mmc.c +++ b/drivers/mmc/sunxi_mmc.c @@ -349,10 +349,14 @@ static int mmc_trans_data_by_cpu(struct sunxi_mmc_priv *priv, struct mmc *mmc, * register without checking the status register after every * read. That saves half of the costly MMIO reads, effectively * doubling the read performance. + * Some SoCs (A20) report a level of 0 if the FIFO is + * completely full (value masked out?). Use a safe minimal + * FIFO size in this case. */ - for (in_fifo = SUNXI_MMC_STATUS_FIFO_LEVEL(status); - in_fifo > 0; - in_fifo--) + in_fifo = SUNXI_MMC_STATUS_FIFO_LEVEL(status); + if (in_fifo == 0 && (status & SUNXI_MMC_STATUS_FIFO_FULL)) + in_fifo = 32; + for (; in_fifo > 0; in_fifo--) buff[i++] = readl_relaxed(&priv->reg->fifo); dmb(); } |