APPLIED: [SRU][K][PATCH 0/1] amdgpu: fix screen freezes with unsupported IP blocks

[Stefan Bader]

On 20.01.23 11:22, Kleber Sacilotto de Souza wrote:
> [Impact]
>  From "Mario Limonciello mario.limonciello at amd.com"
> https://lists.ubuntu.com/archives/kernel-team/2023-January/136434.html.
> 
> There is a problem in amdgpu that if not all of IP blocks are supported or not
> all of the firmware is present then the framebuffer is destroyed and the screen
> freezes. In more recent kernels the amdgpu driver loads for all PCI VGA class
> AMD devices.
> 
> This effectively means that unless you have all the pieces you need to support a
> GPU then the installer freezes unless you do nomodeset.
> 
> This problem is to be fully fixed in kernel 6.3 with a ~47 patch series that is
> currently in drm-next. This does two basic things:
> 1) If the IP blocks isn't supported, don't destroy the framebuffer.
> 2) If firmware for any IP blocks aren't present, don't destroy the framebuffer.
> 
> The whole patch series still needs more time to back in drm-next, but the most
> important part of the series is the first patch which accomplishes "1".
> 
> This patch went out to stable 6.1.y as well:
> 
> https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/drivers/gpu/drm/amd?h=linux-6.1.y&id=dcfeba477b3e3df526e0f543b58fa71c045dff8b
> 
> My reasoning is that it will ensure that if someone picks up a newer GPU such as
> Ryzen 7000 desktop or RDNA3 based they can at least install Ubuntu without
> needing to use "Safe Graphics Mode" at the installer.
> 
> Sure; they won't have hardware acceleration without the rest of the kernel and
> framework, but that's a separate problem to a basic display.
> 
> [Fix]
> Cherry-pick/backport commit 1923bc5a56daeeabd7e9093bad2febcd6af2416a "drm/amd:
> Delay removal of the firmware framebuffer" to Ubuntu Kinetic 5.19 kernel.
> 
> [Test case]
> Boot kernel in a system with one of the amdgpu affected adapters.
> 
> [Where problems can occur]
> The aforementioned commit could introduce other regressions on the support for
> AMD GPUs.
> 
> [Additional Info]
> Test-built against all arches.
> 
> Mario Limonciello (1):
>    drm/amd: Delay removal of the firmware framebuffer
> 
>   drivers/gpu/drm/amd/amdgpu/amdgpu_device.c | 8 ++++++++
>   drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c    | 6 ------
>   2 files changed, 8 insertions(+), 6 deletions(-)
> 

Applied to kinetic:linux/master-prep. Thanks.

-Stefan

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