The brcmfmac driver can generate a scatterlist from a skb with each packets
not aligned to the block size. This is not supported by the Amlogic Descriptor
dma engine where each descriptor must match a multiple of the block size.
The sg list is valid, since the sum of the sg buffers is a multiple of the
block size, but we must discard those when in SD_IO_RW_EXTENDED mode since
SDIO block mode can be used under the hood even with data->blocks == 1.
Those transfers are very rare, thus can be replaced by a bounce buffer
without real performance loss.
Fixes: 7412dee9f1fd ("mmc: meson-gx: replace WARN_ONCE with dev_warn_once about scatterlist size alignment in block mode")
Reported-by: Christian Hewitt <christianshewitt@xxxxxxxxx>
Signed-off-by: Neil Armstrong <narmstrong@xxxxxxxxxxxx>
---
drivers/mmc/host/meson-gx-mmc.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/drivers/mmc/host/meson-gx-mmc.c b/drivers/mmc/host/meson-gx-mmc.c
index 1c61f0f24c09..016a6106151a 100644
--- a/drivers/mmc/host/meson-gx-mmc.c
+++ b/drivers/mmc/host/meson-gx-mmc.c
@@ -236,7 +236,8 @@ static void meson_mmc_get_transfer_mode(struct mmc_host *mmc,
if (host->dram_access_quirk)
return;
- if (data->blocks > 1) {
+ /* SD_IO_RW_EXTENDED (CMD53) can also use block mode under the hood */
+ if (data->blocks > 1 || mrq->cmd->opcode == SD_IO_RW_EXTENDED) {
/*
* In block mode DMA descriptor format, "length" field indicates
* number of blocks and there is no way to pass DMA size that
--
2.25.1
