linux-kernel - [PATCH v2 10/10] drm: xlnx: zynqmp: Fix max dma segment size

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Message-Id: <20250115-xilinx-formats-v2-10-160327ca652a@ideasonboard.com>
Date: Wed, 15 Jan 2025 11:03:39 +0200
From: Tomi Valkeinen <tomi.valkeinen@...asonboard.com>
To: Vishal Sagar <vishal.sagar@....com>, 
 Anatoliy Klymenko <anatoliy.klymenko@....com>, 
 Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>, 
 Maxime Ripard <mripard@...nel.org>, Thomas Zimmermann <tzimmermann@...e.de>, 
 David Airlie <airlied@...il.com>, Simona Vetter <simona@...ll.ch>, 
 Laurent Pinchart <laurent.pinchart@...asonboard.com>, 
 Michal Simek <michal.simek@....com>
Cc: dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org, 
 linux-arm-kernel@...ts.infradead.org, 
 Tomi Valkeinen <tomi.valkeinen@...asonboard.com>, 
 Sean Anderson <sean.anderson@...ux.dev>
Subject: [PATCH v2 10/10] drm: xlnx: zynqmp: Fix max dma segment size

Fix "mapping sg segment longer than device claims to support" warning by
setting the max segment size.

Fixes: d76271d22694 ("drm: xlnx: DRM/KMS driver for Xilinx ZynqMP DisplayPort Subsystem")
Reviewed-by: Sean Anderson <sean.anderson@...ux.dev>
Tested-by: Sean Anderson <sean.anderson@...ux.dev>
Signed-off-by: Tomi Valkeinen <tomi.valkeinen@...asonboard.com>
---
 drivers/gpu/drm/xlnx/zynqmp_dpsub.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/gpu/drm/xlnx/zynqmp_dpsub.c b/drivers/gpu/drm/xlnx/zynqmp_dpsub.c
index f5781939de9c..a25b22238e3d 100644
--- a/drivers/gpu/drm/xlnx/zynqmp_dpsub.c
+++ b/drivers/gpu/drm/xlnx/zynqmp_dpsub.c
@@ -231,6 +231,8 @@ static int zynqmp_dpsub_probe(struct platform_device *pdev)
 	if (ret)
 		return ret;
 
+	dma_set_max_seg_size(&pdev->dev, DMA_BIT_MASK(32));
+
 	/* Try the reserved memory. Proceed if there's none. */
 	of_reserved_mem_device_init(&pdev->dev);
 

-- 
2.43.0