Commit 30d937f6 authored by Dillon Varone's avatar Dillon Varone Committed by Alex Deucher
Browse files

drm/amd/display: Fallback to boot snapshot for dispclk 



[WHY & HOW]
If the dentist is unavailable, fallback to reading CLKIP via the boot
snapshot to get the current dispclk.

Reviewed-by: default avatarNicholas Kazlauskas <nicholas.kazlauskas@amd.com>
Signed-off-by: default avatarDillon Varone <Dillon.Varone@amd.com>
Signed-off-by: default avatarAlex Hung <alex.hung@amd.com>
Cc: Mario Limonciello <mario.limonciello@amd.com>
Cc: Alex Deucher <alexander.deucher@amd.com>
Tested-by: default avatarDan Wheeler <daniel.wheeler@amd.com>
Signed-off-by: default avatarAlex Deucher <alexander.deucher@amd.com>
(cherry picked from commit 2ab77600)
Cc: stable@vger.kernel.org
parent 389c2024

drivers/gpu/drm/amd/display/dc/hwss/dcn401/dcn401_hwseq.c

+5 −1
Original line number Diff line number Diff line
@@ -72,7 +72,11 @@ void dcn401_initialize_min_clocks(struct dc *dc) 
		 * audio corruption. Read current DISPCLK from DENTIST and request the same

		 * freq to ensure that the timing is valid and unchanged.

		 */

		if (dc->clk_mgr->funcs->get_dispclk_from_dentist) {

			clocks->dispclk_khz = dc->clk_mgr->funcs->get_dispclk_from_dentist(dc->clk_mgr);

		} else {

			clocks->dispclk_khz = dc->clk_mgr->boot_snapshot.dispclk * 1000;

		}

	}

	clocks->ref_dtbclk_khz = dc->clk_mgr->bw_params->clk_table.entries[0].dtbclk_mhz * 1000;

	clocks->fclk_p_state_change_support = true;