From: Dillon Varone <dillon.varone@xxxxxxx>
[WHY]
Code for dcn401 to calculate available MALL size for display was shared
with dcn32 and did not provide the correct result for all ASICs.
[HOW]
Add dcn401 specific function to properly calculate the available MALL
for display.
Reviewed-by: Chris Park <chris.park@xxxxxxx>
Signed-off-by: Dillon Varone <dillon.varone@xxxxxxx>
Signed-off-by: Roman Li <roman.li@xxxxxxx>
---
.../dc/resource/dcn32/dcn32_resource.c | 4 +++
.../dc/resource/dcn401/dcn401_resource.c | 27 ++++++++++++++++---
2 files changed, 28 insertions(+), 3 deletions(-)
diff --git a/drivers/gpu/drm/amd/display/dc/resource/dcn32/dcn32_resource.c b/drivers/gpu/drm/amd/display/dc/resource/dcn32/dcn32_resource.c
index a124ad9bd108..f758d463e460 100644
--- a/drivers/gpu/drm/amd/display/dc/resource/dcn32/dcn32_resource.c
+++ b/drivers/gpu/drm/amd/display/dc/resource/dcn32/dcn32_resource.c
@@ -1990,6 +1990,10 @@ unsigned int dcn32_calculate_mall_ways_from_bytes(const struct dc *dc, unsigned
return 0;
}
+ if (dc->caps.max_cab_allocation_bytes == 0) {
+ return 0xffffffff;
+ }
+
/* add 2 lines for worst case alignment */
cache_lines_used = total_size_in_mall_bytes / dc->caps.cache_line_size + 2;
diff --git a/drivers/gpu/drm/amd/display/dc/resource/dcn401/dcn401_resource.c b/drivers/gpu/drm/amd/display/dc/resource/dcn401/dcn401_resource.c
index 59184abab1a7..7da81966b4df 100644
--- a/drivers/gpu/drm/amd/display/dc/resource/dcn401/dcn401_resource.c
+++ b/drivers/gpu/drm/amd/display/dc/resource/dcn401/dcn401_resource.c
@@ -1704,6 +1704,29 @@ static int dcn401_get_power_profile(const struct dc_state *context)
return dpm_level;
}
+static unsigned int dcn401_calc_num_avail_chans_for_mall(struct dc *dc, unsigned int num_chans)
+{
+ unsigned int num_available_chans = 1;
+
+ /* channels for MALL must be a power of 2 */
+ while (num_chans > 1) {
+ num_available_chans = (num_available_chans << 1);
+ num_chans = (num_chans >> 1);
+ }
+
+ /* cannot be odd */
+ num_available_chans &= ~1;
+
+ /* clamp to max available channels for MALL per ASIC */
+ if (ASICREV_IS_GC_12_0_0_A0(dc->ctx->asic_id.hw_internal_rev)) {
+ num_available_chans = num_available_chans > 16 ? 16 : num_available_chans;
+ } else if (ASICREV_IS_GC_12_0_1_A0(dc->ctx->asic_id.hw_internal_rev)) {
+ num_available_chans = num_available_chans > 8 ? 8 : num_available_chans;
+ }
+
+ return num_available_chans;
+}
+
static struct resource_funcs dcn401_res_pool_funcs = {
.destroy = dcn401_destroy_resource_pool,
.link_enc_create = dcn401_link_encoder_create,
@@ -1812,14 +1835,12 @@ static bool dcn401_resource_construct(
dc->caps.min_horizontal_blanking_period = 80;
dc->caps.dmdata_alloc_size = 2048;
dc->caps.mall_size_per_mem_channel = 4;
- /* total size = mall per channel * num channels * 1024 * 1024 */
- dc->caps.mall_size_total = dc->caps.mall_size_per_mem_channel * dc->ctx->dc_bios->vram_info.num_chans * 1048576;
dc->caps.cursor_cache_size = dc->caps.max_cursor_size * dc->caps.max_cursor_size * 8;
dc->caps.cache_line_size = 64;
dc->caps.cache_num_ways = 16;
/* Calculate the available MALL space */
- dc->caps.max_cab_allocation_bytes = dcn32_calc_num_avail_chans_for_mall(
+ dc->caps.max_cab_allocation_bytes = dcn401_calc_num_avail_chans_for_mall(
dc, dc->ctx->dc_bios->vram_info.num_chans) *
dc->caps.mall_size_per_mem_channel * 1024 * 1024;
dc->caps.mall_size_total = dc->caps.max_cab_allocation_bytes;
--
2.34.1
