mmc: renesas_sdhi_internal_dmac: limit DMA RX for old SoCs

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Early revisions of certain SoCs cannot do multiple DMA RX streams in
parallel. To avoid data corruption, only allow one DMA RX channel and
fall back to PIO, if needed.

Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Reviewed-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
Tested-by: Nguyen Viet Dung <dung.nguyen.aj@renesas.com>
Reviewed-by: Simon Horman <horms+renesas@verge.net.au>
Cc: stable@vger.kernel.org
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>

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Wolfram Sang 2018-04-18 20:20:57 +02:00 • committed by Ulf Hansson

parent 300ad89929

commit 0cbc94daa5

1 changed files with 33 additions and 6 deletions

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drivers/mmc/host/renesas_sdhi_internal_dmac.c

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