[PATCH 07/31] drm/amd/display: Calculate MALL cache lines based on Mblks required

[Alex Hung]

From: Alvin Lee <alvin.l...@amd.com>

[Description]
- Calculation for NumWays in MALL should be based on
number of MBlks

Reviewed-by: Jun Lei <jun....@amd.com>
Acked-by: Alex Hung <alex.h...@amd.com>
Signed-off-by: Alvin Lee <alvin.l...@amd.com>
---
 .../gpu/drm/amd/display/dc/dcn32/dcn32_resource.h |  1 +
 .../amd/display/dc/dcn32/dcn32_resource_helpers.c | 15 ++++++++++++++-
 2 files changed, 15 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/amd/display/dc/dcn32/dcn32_resource.h 
b/drivers/gpu/drm/amd/display/dc/dcn32/dcn32_resource.h
index efd449804d7b..1e7e6201c880 100644
--- a/drivers/gpu/drm/amd/display/dc/dcn32/dcn32_resource.h
+++ b/drivers/gpu/drm/amd/display/dc/dcn32/dcn32_resource.h
@@ -29,6 +29,7 @@
 #include "core_types.h"
 
 #define DCN3_2_DET_SEG_SIZE 64
+#define DCN3_2_MALL_MBLK_SIZE_BYTES 65536 // 64 * 1024
 
 #define TO_DCN32_RES_POOL(pool)\
        container_of(pool, struct dcn32_resource_pool, base)
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 47caa2c6d5b4..266c49884f04 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
@@ -51,6 +51,9 @@ uint32_t dcn32_helper_calculate_num_ways_for_subvp(struct dc 
*dc, struct dc_stat
        uint32_t cache_lines_used = 0;
        uint32_t lines_per_way = 0;
        uint32_t total_cache_lines = 0;
+       uint32_t bytes_in_mall = 0;
+       uint32_t num_mblks = 0;
+       uint32_t cache_lines_per_plane = 0;
        uint32_t i = 0;
 
        for (i = 0; i < dc->res_pool->pipe_count; i++) {
@@ -61,9 +64,19 @@ uint32_t dcn32_helper_calculate_num_ways_for_subvp(struct dc 
*dc, struct dc_stat
                                pipe->stream->mall_stream_config.type == 
SUBVP_PHANTOM) {
                        bytes_per_pixel = pipe->plane_state->format >= 
SURFACE_PIXEL_FORMAT_GRPH_ARGB16161616 ? 8 : 4;
                        mall_region_pixels = pipe->stream->timing.h_addressable 
* pipe->stream->timing.v_addressable;
+
+                       // For bytes required in MALL, calculate based on 
number of MBlks required
+                       num_mblks = (mall_region_pixels * bytes_per_pixel +
+                                       DCN3_2_MALL_MBLK_SIZE_BYTES - 1) / 
DCN3_2_MALL_MBLK_SIZE_BYTES;
+                       bytes_in_mall = num_mblks * DCN3_2_MALL_MBLK_SIZE_BYTES;
                        // cache lines used is total bytes / cache_line size. 
Add +2 for worst case alignment
                        // (MALL is 64-byte aligned)
-                       cache_lines_used += (bytes_per_pixel * 
mall_region_pixels) / dc->caps.cache_line_size + 2;
+                       cache_lines_per_plane = bytes_in_mall / 
dc->caps.cache_line_size + 2;
+
+                       // For DCC we must cache the meat surface, so double 
cache lines required
+                       if (pipe->plane_state->dcc.enable)
+                               cache_lines_per_plane *= 2;
+                       cache_lines_used += cache_lines_per_plane;
                }
        }
 
-- 
2.37.1