linux-kernel - [PATCH v3 03/10] drm/client: Use actual bpp when allocating frame buffers

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Date:   Fri,  8 Jul 2022 20:20:48 +0200
From:   Geert Uytterhoeven <geert@...ux-m68k.org>
To:     Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
        Maxime Ripard <mripard@...nel.org>,
        Thomas Zimmermann <tzimmermann@...e.de>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>
Cc:     dri-devel@...ts.freedesktop.org, linux-fbdev@...r.kernel.org,
        linux-m68k@...r.kernel.org, linux-kernel@...r.kernel.org,
        Geert Uytterhoeven <geert@...ux-m68k.org>,
        Javier Martinez Canillas <javierm@...hat.com>
Subject: [PATCH v3 03/10] drm/client: Use actual bpp when allocating frame buffers

When allocating a frame buffer, the number of bits per pixel needed is
derived from the deprecated drm_format_info.cpp[] field.  While this may
work for formats using less than 8 bits per pixel, it does lead to a
large overallocation.

Reduce memory consumption by using the actual number of bits per pixel
instead.

Signed-off-by: Geert Uytterhoeven <geert@...ux-m68k.org>
Acked-by: Thomas Zimmermann <tzimmermann@...e.de>
Reviewed-by: Javier Martinez Canillas <javierm@...hat.com>
---
v3:
  - Add Reviewed-by,

v2:
  - Add Acked-by.
---
 drivers/gpu/drm/drm_client.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/drm_client.c b/drivers/gpu/drm/drm_client.c
index af3b7395bf6932f7..2b230b4d69423752 100644
--- a/drivers/gpu/drm/drm_client.c
+++ b/drivers/gpu/drm/drm_client.c
@@ -264,7 +264,7 @@ drm_client_buffer_create(struct drm_client_dev *client, u32 width, u32 height, u
 
 	dumb_args.width = width;
 	dumb_args.height = height;
-	dumb_args.bpp = info->cpp[0] * 8;
+	dumb_args.bpp = drm_format_info_bpp(info, 0);
 	ret = drm_mode_create_dumb(dev, &dumb_args, client->file);
 	if (ret)
 		goto err_delete;
@@ -373,7 +373,7 @@ static int drm_client_buffer_addfb(struct drm_client_buffer *buffer,
 	int ret;
 
 	info = drm_format_info(format);
-	fb_req.bpp = info->cpp[0] * 8;
+	fb_req.bpp = drm_format_info_bpp(info, 0);
 	fb_req.depth = info->depth;
 	fb_req.width = width;
 	fb_req.height = height;
-- 
2.25.1