drm/amd/display: enable low power mode for VGA memory

[Why]
When unused, all memory blocks should be put in a low power state

[How]
Check the value of enable_mem_low_power.bits.vga and set
corresponding bit in the hardware register

Acked-by: Stylon Wang <stylon.wang@amd.com>
Signed-off-by: Aurabindo Pillai <aurabindo.pillai@amd.com>
Reviewed-by: Rodrigo Siqueira <Rodrigo.Siqueira@amd.com>
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

diff --git a/drivers/gpu/drm/amd/display/dc/dcn30/dcn30_hwseq.c b/drivers/gpu/drm/amd/display/dc/dcn30/dcn30_hwseq.c
index 4cd4ae0..6cef62d 100644 (file)
--- a/drivers/gpu/drm/amd/display/dc/dcn30/dcn30_hwseq.c
+++ b/drivers/gpu/drm/amd/display/dc/dcn30/dcn30_hwseq.c
@@ -461,6 +461,11 @@ void dcn30_init_hw(struct dc *dc)
                REG_SET_2(ODM_MEM_PWR_CTRL3, 0, ODM_MEM_UNASSIGNED_PWR_MODE, 3, ODM_MEM_VBLANK_PWR_MODE, 1);
        }
 
+       if (dc->debug.enable_mem_low_power.bits.vga) {
+               // Power down VGA memory
+               REG_UPDATE(MMHUBBUB_MEM_PWR_CNTL, VGA_MEM_PWR_FORCE, 1);
+       }
+
        if (dc->ctx->dc_bios->fw_info_valid) {
                res_pool->ref_clocks.xtalin_clock_inKhz =
                                dc->ctx->dc_bios->fw_info.pll_info.crystal_frequency;