From: Ville Syrjälä <[email protected]> Despite what the spec says the TIMESTAMP register seems to tick once every hrawclk (confirmed on i965gm and g35).
v2: Rebase Signed-off-by: Ville Syrjälä <[email protected]> --- drivers/gpu/drm/i915/gt/intel_gt_clock_utils.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/drivers/gpu/drm/i915/gt/intel_gt_clock_utils.c b/drivers/gpu/drm/i915/gt/intel_gt_clock_utils.c index 23a27e49b898..2a6a4ca7fdad 100644 --- a/drivers/gpu/drm/i915/gt/intel_gt_clock_utils.c +++ b/drivers/gpu/drm/i915/gt/intel_gt_clock_utils.c @@ -147,8 +147,10 @@ static u32 gen4_read_clock_frequency(struct intel_uncore *uncore) * "The value in this register increments once every 16 * hclks." (through the “Clocking Configuration” * (“CLKCFG”) MCHBAR register) + * + * Testing on actual hardware has shown there is no /16. */ - return RUNTIME_INFO(uncore->i915)->rawclk_freq * 1000 / 16; + return RUNTIME_INFO(uncore->i915)->rawclk_freq * 1000; } static u32 read_clock_frequency(struct intel_uncore *uncore) -- 2.37.4
