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ramips: mtk-mmc: don't advertise highmem support.

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of_dma_configure() sets a default ->dma_mask of
DMA_BIT_MASK(32), claiming devices can DMA from
the full 32bit address space.
The mtk-mmc driver does not support access to
highmem pages, so it is really limited to the
bottom 512M (actually 448M due to 64M of IO space).
Setting ->dma_mask to NULL causes mmc_setup_queue()
to fall-back to using BLK_BOUNCE_HIGH to tell the
block layer to use a bounce-buffer for any highmem
pages requiring IO.

Signed-off-by: NeilBrown <neil@brown.name>
Signed-off-by: Felix Fietkau <nbd@nbd.name>
This commit is contained in:
NeilBrown 2018-02-06 12:22:48 +11:00 committed by Felix Fietkau
parent 1c37cbbbec
commit f27336e115
2 changed files with 2 additions and 0 deletions
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1
target/linux/ramips/files-4.14/drivers/mmc/host/mtk-mmc/sd.c
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@ -2821,6 +2821,7 @@ static int msdc_drv_probe(struct platform_device *pdev)
host->dma.used_gpd = 0;
host->dma.used_bd = 0;
mmc_dev(mmc)->dma_mask = NULL;
/* using dma_alloc_coherent*/ /* todo: using 1, for all 4 slots */
host->dma.gpd = dma_alloc_coherent(NULL, MAX_GPD_NUM * sizeof(gpd_t), &host->dma.gpd_addr, GFP_KERNEL);

1
target/linux/ramips/files-4.9/drivers/mmc/host/mtk-mmc/sd.c
View file

@ -2821,6 +2821,7 @@ static int msdc_drv_probe(struct platform_device *pdev)
host->dma.used_gpd = 0;
host->dma.used_bd = 0;
mmc_dev(mmc)->dma_mask = NULL;
/* using dma_alloc_coherent*/ /* todo: using 1, for all 4 slots */
host->dma.gpd = dma_alloc_coherent(NULL, MAX_GPD_NUM * sizeof(gpd_t), &host->dma.gpd_addr, GFP_KERNEL);