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mmc: meson-gx: make replace WARN_ONCE with dev_warn_once about scatterlist offset alignment

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Some drivers like ath10k can sometimg give an sg buffer with an offset whose alignment
is not compatible with the Amlogic DMA descriptor engine requirements.

Simply replace with dev_warn_once() to inform user this should be fixed to avoid
degraded performance.

This should be ultimately fixed in ath10k, but since it's only a performance issue
the warning should be removed.

Fixes: 79ed05e329 ("mmc: meson-gx: add support for descriptor chain mode")
Cc: stable@vger.kernel.org
Reported-by: Christian Hewitt <christianshewitt@gmail.com>
Signed-off-by: Neil Armstrong <narmstrong@baylibre.com>
Acked-by: Martin Blumenstingl <martin.blumenstingl@googlemail.com>
Link: https://lore.kernel.org/r/20210426175559.3110575-1-narmstrong@baylibre.com
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
This commit is contained in:
Neil Armstrong 2021-04-26 19:55:58 +02:00 committed by Ulf Hansson
parent 6efb943b86
commit cabb1bb60e
1 changed files with 3 additions and 1 deletions
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4
drivers/mmc/host/meson-gx-mmc.c
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@ -258,7 +258,9 @@ static void meson_mmc_get_transfer_mode(struct mmc_host *mmc,
for_each_sg(data->sg, sg, data->sg_len, i) {
/* check for 8 byte alignment */
if (sg->offset % 8) {
WARN_ONCE(1, "unaligned scatterlist buffer\n");
dev_warn_once(mmc_dev(mmc),
"unaligned sg offset %u, disabling descriptor DMA for transfer\n",
sg->offset);
return;
}
}