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drm/radeon: avoid bogus "vram limit (0) must be a power of 2" warning

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[ Upstream commit 9da2902609f7519c48eda84f953f72fee53f2b71 ]

I was getting the following message on boot on Linux 5.19-rc5:
        radeon 0000:01:05.0: vram limit (0) must be a power of 2
(I didn't use any radeon.vramlimit commandline parameter).

This is caused by
commit 8c2d34eb53b9 ("drm/radeon: use kernel is_power_of_2 rather than local version")
which removed radeon_check_pot_argument() and converted its users to
is_power_of_2(). The two functions differ in its handling of 0, which is
the default value of radeon_vram_limit: radeon_check_pot_argument()
"incorrectly" considered it a power of 2, while is_power_of_2() does not.

An appropriate conditional silences the warning message.

It is not necessary to add a similar test to other callers of
is_power_of_2() in radeon_device.c. The matching commit in amdgpu:
commit 761175078466 ("drm/amdgpu: use kernel is_power_of_2 rather than local version")
is unaffected by this bug.

Tested on Radeon HD 3200.

Not ccing stable, this is not serious enough.

Fixes: 8c2d34eb53b9 ("drm/radeon: use kernel is_power_of_2 rather than local version")
Cc: Alex Deucher <alexander.deucher@amd.com>
Cc: Christian König <christian.koenig@amd.com>
Cc: "Pan, Xinhui" <Xinhui.Pan@amd.com>
Cc: David Airlie <airlied@linux.ie>
Cc: Daniel Vetter <daniel@ffwll.ch>
Cc: Jonathan Gray <jsg@jsg.id.au>
Signed-off-by: Mateusz Jończyk <mat.jonczyk@o2.pl>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Mateusz Jończyk 2022-07-06 22:01:44 +02:00 committed by Greg Kroah-Hartman
parent 0b07f28c23
commit 69d05f0a4b
1 changed files with 1 additions and 1 deletions
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2
drivers/gpu/drm/radeon/radeon_device.c
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@ -1113,7 +1113,7 @@ static int radeon_gart_size_auto(enum radeon_family family)
static void radeon_check_arguments(struct radeon_device *rdev)
{
/* vramlimit must be a power of two */
if (!is_power_of_2(radeon_vram_limit)) {
if (radeon_vram_limit != 0 && !is_power_of_2(radeon_vram_limit)) {
dev_warn(rdev->dev, "vram limit (%d) must be a power of 2\n",
radeon_vram_limit);
radeon_vram_limit = 0;