Re: [PATCH for 6.12 3/9] drm/amd/display: Disable fastboot on DCE 6 too

[Timur Kristóf]

On Friday, March 27, 2026 12:47:10 AM Central European Summer Time Rosen Penev 
wrote:
> From: Timur Kristóf <timur.kristof@xxxxxxxxx>
> 
> [ Upstream commit 7495962cbceb967e095233a5673ea71f3bcdee7e ]
> 
> It already didn't work on DCE 8,
> so there is no reason to assume it would on DCE 6.
> 
> Signed-off-by: Timur Kristóf <timur.kristof@xxxxxxxxx>
> Reviewed-by: Rodrigo Siqueira <siqueira@xxxxxxxxxx>
> Reviewed-by: Alex Deucher <alexander.deucher@xxxxxxx>
> Reviewed-by: Alex Hung <alex.hung@xxxxxxx>
> Signed-off-by: Alex Deucher <alexander.deucher@xxxxxxx>
> Signed-off-by: Rosen Penev <rosenp@xxxxxxxxx>

This patch is incorrect and should not be backported.

(Note that the error is already fixed upstream. For stable kernels IMO it's 
best to drop this one.)

> ---
>  drivers/gpu/drm/amd/display/dc/hwss/dce110/dce110_hwseq.c | 6 ++----
>  1 file changed, 2 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/gpu/drm/amd/display/dc/hwss/dce110/dce110_hwseq.c
> b/drivers/gpu/drm/amd/display/dc/hwss/dce110/dce110_hwseq.c index
> df69e0cebf78..7dc99c85b8ea 100644
> --- a/drivers/gpu/drm/amd/display/dc/hwss/dce110/dce110_hwseq.c
> +++ b/drivers/gpu/drm/amd/display/dc/hwss/dce110/dce110_hwseq.c
> @@ -1910,10 +1910,8 @@ void dce110_enable_accelerated_mode(struct dc *dc,
> struct dc_state *context)
> 
>  	get_edp_streams(context, edp_streams, &edp_stream_num);
> 
> -	// Check fastboot support, disable on DCE8 because of blank 
screens
> -	if (edp_num && edp_stream_num && dc->ctx->dce_version != 
DCE_VERSION_8_0
> && -		    dc->ctx->dce_version != DCE_VERSION_8_1 &&
> -		    dc->ctx->dce_version != DCE_VERSION_8_3) {
> +	/* Check fastboot support, disable on DCE 6-8 because of blank 
screens */
> +	if (edp_num && edp_stream_num && dc->ctx->dce_version < 
DCE_VERSION_10_0)
> { for (i = 0; i < edp_num; i++) {
>  			edp_link = edp_links[i];
>  			if (edp_link != edp_streams[0]->link)