mmc: bcm2835-sdhost Observe SWIOTLB memory limit

Make sure the sdhost driver doesn't use requests bigger than SWIOTLB can handle. Copied from [1]. Link: #6589 Signed-off-by: Phil Elwell <[email protected]> [1] d4dd9bc ("mmc: bcm2835: Take SWIOTLB memory size limitation into account")
raspberrypi · Jan 10, 2025 · dfff383 · dfff383
1 parent d06cb35
commit dfff383
Showing 1 changed file with 1 addition and 1 deletion.
diff --git a/drivers/mmc/host/bcm2835-sdhost.c b/drivers/mmc/host/bcm2835-sdhost.c
@@ -1971,7 +1971,7 @@ int bcm2835_sdhost_add_host(struct platform_device *pdev)
 	}
 
 	mmc->max_segs = 128;
-	mmc->max_req_size = 524288;
+	mmc->max_req_size = min_t(size_t, 524288, dma_max_mapping_size(&pdev->dev));
 	mmc->max_seg_size = mmc->max_req_size;
 	mmc->max_blk_size = 512;
 	mmc->max_blk_count =  65535;