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Re: [PATCH v2 25/25] drm/xlnx: Compute dumb-buffer sizes with drm_mode_size_dumb()
- To: Thomas Zimmermann <tzimmermann@xxxxxxx>, maarten.lankhorst@xxxxxxxxxxxxxxx, mripard@xxxxxxxxxx, airlied@xxxxxxxxx, simona@xxxxxxxx
- From: Tomi Valkeinen <tomi.valkeinen@xxxxxxxxxxxxxxxx>
- Date: Mon, 20 Jan 2025 10:51:23 +0200
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- Cc: dri-devel@xxxxxxxxxxxxxxxxxxxxx, linux-mediatek@xxxxxxxxxxxxxxxxxxx, freedreno@xxxxxxxxxxxxxxxxxxxxx, linux-arm-msm@xxxxxxxxxxxxxxx, imx@xxxxxxxxxxxxxxx, linux-samsung-soc@xxxxxxxxxxxxxxx, nouveau@xxxxxxxxxxxxxxxxxxxxx, virtualization@xxxxxxxxxxxxxxx, spice-devel@xxxxxxxxxxxxxxxxxxxxx, linux-renesas-soc@xxxxxxxxxxxxxxx, linux-rockchip@xxxxxxxxxxxxxxxxxxx, linux-tegra@xxxxxxxxxxxxxxx, intel-xe@xxxxxxxxxxxxxxxxxxxxx, xen-devel@xxxxxxxxxxxxxxxxxxxx, Laurent Pinchart <laurent.pinchart@xxxxxxxxxxxxxxxx>, Andy Yan <andyshrk@xxxxxxx>, Daniel Stone <daniel@xxxxxxxxxxxxx>
- Delivery-date: Mon, 20 Jan 2025 08:51:36 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
Hi,
On 20/01/2025 09:49, Thomas Zimmermann wrote:
Hi
Am 16.01.25 um 11:03 schrieb Tomi Valkeinen:
[...]
Aligning video= and dumb buffers almost sounds like going backwards.
video= parameter is bad,
Who told you that? Video= is still the way to specify an initial display
mode to the kernel and it will remain so.
You did =). "It aligns dumb buffers and video=". I understand the need
for drm_driver_color_mode_format() for video=. But I think it's bad for
CREATE_DUMB, at least for the platforms which have never aimed for
"RGB-only".
So you're not in favor of a drm_mode_size_dumb() version that does not
use drm_driver_color_mode_format(), for these platforms? I'm still at
loss as to why we would want to change the behavior of CREATE_DUMB. I
see no upside, but I see the chance of regressions.
Tomi
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