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

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

Reviewed-by: Nicholas Kazlauskas <nicholas.kazlauskas@amd.com>
Signed-off-by: Dillon Varone <Dillon.Varone@amd.com>
Signed-off-by: Alex Hung <alex.hung@amd.com>
Cc: Mario Limonciello <mario.limonciello@amd.com>
Cc: Alex Deucher <alexander.deucher@amd.com>
Tested-by: Dan Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
(cherry picked from commit 2ab77600d1e55a042c02437326d3c7563e853c6c)
Cc: stable@vger.kernel.org
This commit is contained in:
Dillon Varone 2026-02-18 14:34:28 -05:00 • committed by Alex Deucher
parent 389c2024ca
commit 30d937f63b
1 changed files with 5 additions and 1 deletions
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6
drivers/gpu/drm/amd/display/dc/hwss/dcn401/dcn401_hwseq.c
View file

@ -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.
*/
clocks->dispclk_khz = dc->clk_mgr->funcs->get_dispclk_from_dentist(dc->clk_mgr);
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;