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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