[PATCH v3 02/15] drm/rockchip: Set dma mask to 64 bit
From: Andy Yan <hidden>
Date: 2024-09-20 08:21:10
Also in:
dri-devel, linux-devicetree, linux-rockchip, lkml
Subsystem:
arm/rockchip soc support, drm drivers, drm drivers and misc gpu patches, drm drivers for rockchip, the rest · Maintainers:
Heiko Stuebner, David Airlie, Simona Vetter, Maarten Lankhorst, Maxime Ripard, Thomas Zimmermann, Sandy Huang, Heiko Stübner, Andy Yan, Linus Torvalds
From: Andy Yan <andy.yan@rock-chips.com> The vop mmu support translate physical address upper 4 GB to iova below 4 GB. So set dma mask to 64 bit to indicate we support address
4GB.
This can avoid warnging message like this on some boards with DDR
4 GB:
rockchip-drm display-subsystem: swiotlb buffer is full (sz: 266240 bytes), total 32768 (slots), used 130 (slots) rockchip-drm display-subsystem: swiotlb buffer is full (sz: 266240 bytes), total 32768 (slots), used 0 (slots) rockchip-drm display-subsystem: swiotlb buffer is full (sz: 266240 bytes), total 32768 (slots), used 130 (slots) rockchip-drm display-subsystem: swiotlb buffer is full (sz: 266240 bytes), total 32768 (slots), used 130 (slots) rockchip-drm display-subsystem: swiotlb buffer is full (sz: 266240 bytes), total 32768 (slots), used 0 (slots) Signed-off-by: Andy Yan <andy.yan@rock-chips.com> Tested-by: Derek Foreman <redacted> --- (no changes since v1) drivers/gpu/drm/rockchip/rockchip_drm_drv.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/rockchip/rockchip_drm_drv.c b/drivers/gpu/drm/rockchip/rockchip_drm_drv.c
index 04ef7a2c3833..8bc2ff3b04bb 100644
--- a/drivers/gpu/drm/rockchip/rockchip_drm_drv.c
+++ b/drivers/gpu/drm/rockchip/rockchip_drm_drv.c@@ -445,7 +445,9 @@ static int rockchip_drm_platform_probe(struct platform_device *pdev) return ret; } - return 0; + ret = dma_coerce_mask_and_coherent(dev, DMA_BIT_MASK(64)); + + return ret; } static void rockchip_drm_platform_remove(struct platform_device *pdev)
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2.34.1