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@xxxxxxxx> --- drivers/staging/mt7621-mmc/sd.c | 5 +---- 1 file changed, 1 insertion(+), 4 deletions(-) diff --git a/drivers/staging/mt7621-mmc/sd.c b/drivers/staging/mt7621-mmc/sd.c index b51a4b156605..706eab4e1237 100644 --- a/drivers/staging/mt7621-mmc/sd.c +++ b/drivers/staging/mt7621-mmc/sd.c @@ -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); -- 2.16.1 _______________________________________________ devel mailing list devel@xxxxxxxxxxxxxxxxxxxxxx http://driverdev.linuxdriverproject.org/mailman/listinfo/driverdev-devel
