[PATCH 2/3] drm/amd/display: enable low power mode for VGA memory

[Rodrigo Siqueira Jordao]

On 5/11/23 09:38, Aurabindo Pillai wrote:
> [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
> 
> Signed-off-by: Aurabindo Pillai <aurabindo.pillai at amd.com>
> ---
>   drivers/gpu/drm/amd/display/dc/dcn30/dcn30_hwseq.c | 5 +++++
>   1 file changed, 5 insertions(+)
> 
> 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 3303c9aae068..c9ec158c5aa7 100644
> --- a/drivers/gpu/drm/amd/display/dc/dcn30/dcn30_hwseq.c
> +++ b/drivers/gpu/drm/amd/display/dc/dcn30/dcn30_hwseq.c
> @@ -487,6 +487,11 @@ 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;

Reviewed-by: Rodrigo Siqueira <Rodrigo.Siqueira at amd.com>