[PATCH 0/1] drm/hisilicon/hibmc: Make CONFIG_DRM_HISI_HIBMC depend on ARM64

[xinliang]

On 2019/8/15 12:26, Matthew Ruffell wrote:
> Hi,
>
> amd64 based Huawei servers have problems where the display output of their iBMC
> chips is broken, resulting in a "blurry" screen when viewed from their in house
> remote kvm-like console.
>
> Example:
>
> https://launchpadlibrarian.net/365907668/creen_picture_for_blur.png
>
> The issue is caused by the hibmc_drm kernel module being loaded. The PCI ID for
> the iBMC chips on amd64 hardware is the same as arm64 hardware, but the
> hibmc_drm driver was developed only for use on arm64 hardware, most notably for
> the Huawei D05 development board.
>
> The impact to Huawei is that their customers cannot use Ubuntu server install
> media as the screen goes "blurry" when the d-i install media or subuqity
> installer loads the hibmc_drm kernel module after language selection.
>
> The only workaround for their customers is to press the "E" key during the very
> first installer menu and adding "modprobe.blacklist=hibmc_drm" to the kernel
> command line in the grub menu. This is not good for customer experience with
> their servers.
>
> Huawei help site on the matter:
>
> https://support.huawei.com/enterprise/en/knowledge/EKB1100015521
>
> Other problems exist for the hibmc_drm driver on amd64, such as working on
> bios, but not uefi, and not being wayland compatible, making the screen "blurry"
> whenever a desktop session is started and gdm loaded.
>
> More information about the above can be found on Launchpad:
>
> https://bugs.launchpad.net/bugs/1762940
>
> Huawei have asked us to remove hibmc_drm from all architectures except arm64,
> and this aligns with advice from Hisilicon.
>
> Hibmc maintainers, can you please review the status of hibmc_drm on amd64 and
> confirm that these issues exist, and consider merging the patch to update
> Kconfig to set CONFIG_DRM_HISI_HIBMC arm64 only.
>
> Matthew Ruffell (1):
>    drm/hisilicon/hibmc: Make CONFIG_DRM_HISI_HIBMC depend on ARM64
>
>   drivers/gpu/drm/hisilicon/hibmc/Kconfig | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)

Thanks Matthew for the patch.
For the patch,
Acked-by: Xinliang Liu <z.liuxinliang at hisilicon.com>
And applied and will push to drm maintainer soon.

Thanks,
Xinliang

>