linux-kernel - [PATCH] drm/rockchip: Set DMA max segment size

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Message-Id: <20240524092400.2019587-1-s.pueschel@pengutronix.de>
Date: Fri, 24 May 2024 11:23:59 +0200
From: Sven Püschel <s.pueschel@...gutronix.de>
To: hjc@...k-chips.com,
	heiko@...ech.de,
	andy.yan@...k-chips.com,
	maarten.lankhorst@...ux.intel.com,
	mripard@...nel.org,
	tzimmermann@...e.de,
	airlied@...il.com,
	daniel@...ll.ch
Cc: dri-devel@...ts.freedesktop.org,
	linux-arm-kernel@...ts.infradead.org,
	linux-rockchip@...ts.infradead.org,
	linux-kernel@...r.kernel.org,
	kernel@...gutronix.de,
	Michael Tretter <m.tretter@...gutronix.de>,
	Sven Püschel <s.pueschel@...gutronix.de>
Subject: [PATCH] drm/rockchip: Set DMA max segment size

From: Michael Tretter <m.tretter@...gutronix.de>

There is no reason to limit the DMA max segment size for the Rockchip
VOP and VOP2. Set it to the maximum.

This prevents the following warning when DMA API debugging is enabled
with CONFIG_DMA_API_DEBUG_SG=y:

	DMA-API: rockchip-drm display-subsystem: mapping sg segment longer than device claims to support [len=208896] [max=65536]

Signed-off-by: Michael Tretter <m.tretter@...gutronix.de>
Signed-off-by: Sven Püschel <s.pueschel@...gutronix.de>
---
 drivers/gpu/drm/rockchip/rockchip_drm_drv.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/gpu/drm/rockchip/rockchip_drm_drv.c b/drivers/gpu/drm/rockchip/rockchip_drm_drv.c
index ab55d7132550..0f93efd1a8fa 100644
--- a/drivers/gpu/drm/rockchip/rockchip_drm_drv.c
+++ b/drivers/gpu/drm/rockchip/rockchip_drm_drv.c
@@ -67,6 +67,8 @@ int rockchip_drm_dma_attach_device(struct drm_device *drm_dev,
 		}
 	}
 
+	dma_set_max_seg_size(drm_dev->dev, UINT_MAX);
+
 	ret = iommu_attach_device(private->domain, dev);
 	if (ret) {
 		DRM_DEV_ERROR(dev, "Failed to attach iommu device\n");

base-commit: 39bc27bd688066a63e56f7f64ad34fae03fbe3b8
-- 
2.39.2