Always use direct dma ops and no swiotlb.
Note: arm-smmu-qcom already avoids creating iommu dma ops, but not everything uses arm-smmu-qcom and this also sets the dma mask.
Signed-off-by: Jonathan Marek jonathan@marek.ca --- drivers/gpu/drm/msm/Kconfig | 1 + drivers/gpu/drm/msm/msm_drv.c | 8 +++++--- 2 files changed, 6 insertions(+), 3 deletions(-)
diff --git a/drivers/gpu/drm/msm/Kconfig b/drivers/gpu/drm/msm/Kconfig index e5816b498494..07c50405970a 100644 --- a/drivers/gpu/drm/msm/Kconfig +++ b/drivers/gpu/drm/msm/Kconfig @@ -20,6 +20,7 @@ config DRM_MSM select SND_SOC_HDMI_CODEC if SND_SOC select SYNC_FILE select PM_OPP + select DMA_OPS_BYPASS help DRM/KMS driver for MSM/snapdragon.
diff --git a/drivers/gpu/drm/msm/msm_drv.c b/drivers/gpu/drm/msm/msm_drv.c index 49685571dc0e..bae48afca82e 100644 --- a/drivers/gpu/drm/msm/msm_drv.c +++ b/drivers/gpu/drm/msm/msm_drv.c @@ -6,6 +6,7 @@ */
#include <linux/dma-mapping.h> +#include <linux/dma-direct.h> #include <linux/kthread.h> #include <linux/uaccess.h> #include <uapi/linux/sched/types.h> @@ -1288,10 +1289,11 @@ static int msm_pdev_probe(struct platform_device *pdev) if (ret) goto fail;
- /* on all devices that I am aware of, iommu's which can map - * any address the cpu can see are used: + /* always use direct dma ops and no swiotlb + * note: arm-smmu-qcom already avoids creating iommu dma ops, but + * not everything uses arm-smmu-qcom and this also sets the dma mask */ - ret = dma_set_mask_and_coherent(&pdev->dev, ~0); + ret = dma_direct_bypass(&pdev->dev); if (ret) goto fail;