linux-kernel - Re: [PATCH v2 1/2] drm/amd/display: fix the white screen issue when >= 64GB DRAM

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Date:   Mon, 11 Sep 2023 10:38:28 +0200
From:   Christian König <ckoenig.leichtzumerken@...il.com>
To:     Hamza Mahfooz <hamza.mahfooz@....com>,
        amd-gfx@...ts.freedesktop.org
Cc:     Alan Liu <haoping.liu@....com>, Lijo Lazar <lijo.lazar@....com>,
        dri-devel@...ts.freedesktop.org,
        Mario Limonciello <mario.limonciello@....com>,
        David Airlie <airlied@...il.com>,
        Shashank Sharma <shashank.sharma@....com>,
        Rodrigo Siqueira <Rodrigo.Siqueira@....com>,
        Aurabindo Pillai <aurabindo.pillai@....com>,
        Qingqing Zhuo <Qingqing.Zhuo@....com>,
        Harry Wentland <harry.wentland@....com>,
        Stylon Wang <stylon.wang@....com>,
        Victor Zhao <Victor.Zhao@....com>,
        Srinivasan Shanmugam <srinivasan.shanmugam@....com>,
        Leo Li <sunpeng.li@....com>,
        Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
        Le Ma <le.ma@....com>, Hersen Wu <hersenxs.wu@....com>,
        Yifan Zhang <yifan1.zhang@....com>,
        Felix Kuehling <felix.kuehling@....com>,
        "Pan, Xinhui" <Xinhui.Pan@....com>, linux-kernel@...r.kernel.org,
        stable@...r.kernel.org, Hawking Zhang <Hawking.Zhang@....com>,
        Daniel Vetter <daniel@...ll.ch>, Wayne Lin <wayne.lin@....com>,
        Alex Deucher <alexander.deucher@....com>,
        Candice Li <candice.li@....com>, Lang Yu <Lang.Yu@....com>,
        Christian König <christian.koenig@....com>,
        Luben Tuikov <luben.tuikov@....com>
Subject: Re: [PATCH v2 1/2] drm/amd/display: fix the white screen issue when
 >= 64GB DRAM

Am 08.09.23 um 16:55 schrieb Hamza Mahfooz:
> From: Yifan Zhang <yifan1.zhang@....com>
>
> Dropping bit 31:4 of page table base is wrong, it makes page table
> base points to wrong address if phys addr is beyond 64GB; dropping
> page_table_start/end bit 31:4 is unnecessary since dcn20_vmid_setup
> will do that. Also, while we are at it, cleanup the assignments using
> upper_32_bits()/lower_32_bits() and AMDGPU_GPU_PAGE_SHIFT.
>
> Cc: stable@...r.kernel.org
> Link: https://gitlab.freedesktop.org/drm/amd/-/issues/2354
> Fixes: 81d0bcf99009 ("drm/amdgpu: make display pinning more flexible (v2)")
> Signed-off-by: Yifan Zhang <yifan1.zhang@....com>
> Signed-off-by: Hamza Mahfooz <hamza.mahfooz@....com>

Reviewed-by: Christian König <christian.koenig@....com> for the series 
as well.

> ---
> v2: use upper_32_bits()/lower_32_bits() and AMDGPU_GPU_PAGE_SHIFT
> ---
>   drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c | 14 +++++++++-----
>   1 file changed, 9 insertions(+), 5 deletions(-)
>
> diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
> index 1bb1a394f55f..5f14cd9391ca 100644
> --- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
> +++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
> @@ -1283,11 +1283,15 @@ static void mmhub_read_system_context(struct amdgpu_device *adev, struct dc_phy_
>   
>   	pt_base = amdgpu_gmc_pd_addr(adev->gart.bo);
>   
> -	page_table_start.high_part = (u32)(adev->gmc.gart_start >> 44) & 0xF;
> -	page_table_start.low_part = (u32)(adev->gmc.gart_start >> 12);
> -	page_table_end.high_part = (u32)(adev->gmc.gart_end >> 44) & 0xF;
> -	page_table_end.low_part = (u32)(adev->gmc.gart_end >> 12);
> -	page_table_base.high_part = upper_32_bits(pt_base) & 0xF;
> +	page_table_start.high_part = upper_32_bits(adev->gmc.gart_start >>
> +						   AMDGPU_GPU_PAGE_SHIFT);
> +	page_table_start.low_part = lower_32_bits(adev->gmc.gart_start >>
> +						  AMDGPU_GPU_PAGE_SHIFT);
> +	page_table_end.high_part = upper_32_bits(adev->gmc.gart_end >>
> +						 AMDGPU_GPU_PAGE_SHIFT);
> +	page_table_end.low_part = lower_32_bits(adev->gmc.gart_end >>
> +						AMDGPU_GPU_PAGE_SHIFT);
> +	page_table_base.high_part = upper_32_bits(pt_base);
>   	page_table_base.low_part = lower_32_bits(pt_base);
>   
>   	pa_config->system_aperture.start_addr = (uint64_t)logical_addr_low << 18;