linux-kernel - [PATCH 3/3] drm/gem-vram: revert the 8-byte alignment constraint

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Message-ID: <20251126-lcd_pitch_alignment-v1-3-991610a1e369@microchip.com>
Date: Wed, 26 Nov 2025 15:44:46 +0100
From: Ludovic Desroches <ludovic.desroches@...rochip.com>
To: 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>
CC: <dri-devel@...ts.freedesktop.org>, <linux-kernel@...r.kernel.org>,
	"Ludovic Desroches" <ludovic.desroches@...rochip.com>
Subject: [PATCH 3/3] drm/gem-vram: revert the 8-byte alignment constraint

Using drm_mode_size_dumb() to compute the size of dumb buffers introduced
an 8-byte alignment constraint on the pitch that wasn’t present before.
Let’s remove this constraint, which isn’t necessarily required and may
cause buffers to be allocated larger than needed.

Signed-off-by: Ludovic Desroches <ludovic.desroches@...rochip.com>
---
 drivers/gpu/drm/drm_gem_vram_helper.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/drm_gem_vram_helper.c b/drivers/gpu/drm/drm_gem_vram_helper.c
index f40f6e167f126681201b13d60be9c508f25d481f..3ab91965ec6f8fa275b9556079dfb335a02664bb 100644
--- a/drivers/gpu/drm/drm_gem_vram_helper.c
+++ b/drivers/gpu/drm/drm_gem_vram_helper.c
@@ -553,7 +553,7 @@ int drm_gem_vram_driver_dumb_create(struct drm_file *file,
 	if (WARN_ONCE(!dev->vram_mm, "VRAM MM not initialized"))
 		return -EINVAL;
 
-	ret = drm_mode_size_dumb(dev, args, SZ_8, 0);
+	ret = drm_mode_size_dumb(dev, args, 0, 0);
 	if (ret)
 		return ret;
 

-- 
2.51.0