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staging: mt7621-mmc: Always use linked DMA mode

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Current code uses linked DMA mode only when there is more than one
entry in the scatterlist. But the overhead of the linked DMA is very
small, so the code is easier when only using linked DMA and this is
also the way, the upstream driver mtk-sd handles it.

Signed-off-by: Christian Lütke-Stetzkamp <christian@lkamp.de>
Reviewed-by: NeilBrown <neil@brown.name>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Christian Lütke-Stetzkamp 2018-04-29 19:32:40 +02:00 • committed by Greg Kroah-Hartman
parent 759c05d317
commit a0381e2e28
1 changed files with 1 additions and 4 deletions
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5
drivers/staging/mt7621-mmc/sd.c
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@ -1169,10 +1169,7 @@ static void msdc_dma_setup(struct msdc_host *host, struct msdc_dma *dma,
dma->sg = sg;
dma->sglen = sglen;
if (sglen == 1 && sg_dma_len(sg) <= MAX_DMA_CNT)
dma->mode = MSDC_MODE_DMA_BASIC;
else
dma->mode = MSDC_MODE_DMA_DESC;
dma->mode = MSDC_MODE_DMA_DESC;
N_MSG(DMA, "DMA mode<%d> sglen<%d> xfersz<%d>", dma->mode, dma->sglen,
host->xfer_size);