Patch "drm/amd/display: Added debug option for forcing subvp num ways" has been added to the 6.0-stable tree

[Sasha Levin <sashal@xxxxxxxxxx>]

This is a note to let you know that I've just added the patch titled

    drm/amd/display: Added debug option for forcing subvp num ways

to the 6.0-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     drm-amd-display-added-debug-option-for-forcing-subvp.patch
and it can be found in the queue-6.0 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.



commit a58e8725e86ad0f437659d244bcc096f100bc475
Author: Lee, Alvin <Alvin.Lee2@xxxxxxx>
Date:   Thu Aug 25 16:05:03 2022 -0400

    drm/amd/display: Added debug option for forcing subvp num ways
    
    [ Upstream commit 5c1a431aaf52bbba8b6e2c4e9b4037a09509c0e3 ]
    
    [Description]
    Regkey option for forcing num ways for subvp for debug purposes
    
    Tested-by: Daniel Wheeler <daniel.wheeler@xxxxxxx>
    Reviewed-by: Jun Lei <Jun.Lei@xxxxxxx>
    Acked-by: Pavle Kotarac <Pavle.Kotarac@xxxxxxx>
    Signed-off-by: Alvin Lee <Alvin.Lee2@xxxxxxx>
    Signed-off-by: Alex Deucher <alexander.deucher@xxxxxxx>
    Stable-dep-of: 4d2852412306 ("drm/amd/display: Fix calculation for cursor CAB allocation")
    Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>

diff --git a/drivers/gpu/drm/amd/display/dc/dc.h b/drivers/gpu/drm/amd/display/dc/dc.h
index dbf8158b832e..a652dec5d02f 100644
--- a/drivers/gpu/drm/amd/display/dc/dc.h
+++ b/drivers/gpu/drm/amd/display/dc/dc.h
@@ -746,6 +746,7 @@ struct dc_debug_options {
 	bool force_disable_subvp;
 	bool force_subvp_mclk_switch;
 	bool allow_sw_cursor_fallback;
+	unsigned int force_subvp_num_ways;
 	bool force_usr_allow;
 	/* uses value at boot and disables switch */
 	bool disable_dtb_ref_clk_switch;
diff --git a/drivers/gpu/drm/amd/display/dc/dcn32/dcn32_resource_helpers.c b/drivers/gpu/drm/amd/display/dc/dcn32/dcn32_resource_helpers.c
index 13cd1f2e50ca..7c37575d69c7 100644
--- a/drivers/gpu/drm/amd/display/dc/dcn32/dcn32_resource_helpers.c
+++ b/drivers/gpu/drm/amd/display/dc/dcn32/dcn32_resource_helpers.c
@@ -54,13 +54,14 @@ uint32_t dcn32_helper_calculate_num_ways_for_subvp(struct dc *dc, struct dc_stat
 	uint32_t num_mblks = 0;
 	uint32_t cache_lines_per_plane = 0;
 	uint32_t i = 0, j = 0;
-	uint32_t mblk_width = 0;
-	uint32_t mblk_height = 0;
+	uint16_t mblk_width = 0;
+	uint16_t mblk_height = 0;
 	uint32_t full_vp_width_blk_aligned = 0;
 	uint32_t full_vp_height_blk_aligned = 0;
 	uint32_t mall_alloc_width_blk_aligned = 0;
 	uint32_t mall_alloc_height_blk_aligned = 0;
-	uint32_t full_vp_height = 0;
+	uint16_t full_vp_height = 0;
+	bool subvp_in_use = false;
 
 	for (i = 0; i < dc->res_pool->pipe_count; i++) {
 		struct pipe_ctx *pipe = &context->res_ctx.pipe_ctx[i];
@@ -70,6 +71,7 @@ uint32_t dcn32_helper_calculate_num_ways_for_subvp(struct dc *dc, struct dc_stat
 				pipe->stream->mall_stream_config.type == SUBVP_PHANTOM) {
 			struct pipe_ctx *main_pipe = NULL;
 
+			subvp_in_use = true;
 			/* Get full viewport height from main pipe (required for MBLK calculation) */
 			for (j = 0; j < dc->res_pool->pipe_count; j++) {
 				main_pipe = &context->res_ctx.pipe_ctx[j];
@@ -129,6 +131,9 @@ uint32_t dcn32_helper_calculate_num_ways_for_subvp(struct dc *dc, struct dc_stat
 	if (cache_lines_used % lines_per_way > 0)
 		num_ways++;
 
+	if (subvp_in_use && dc->debug.force_subvp_num_ways > 0)
+		num_ways = dc->debug.force_subvp_num_ways;
+
 	return num_ways;
 }