The dpll actually runs at the port clock so we don't need
to multiply it again with the pixel multiplier to get the
adjusted_mode.clock. This is in contrast to the ironlake
pixel clock readout code which uses the fdi dotclock: That
one does _not_ run with multiplied pixels.
This issue goes back to the original clock readout code added
in
commit f1f644dc66cbaf5a4c7dcde683361536b41885b9
Author: Jesse Barnes <jbarnes@xxxxxxxxxxxxxxxx>
Date: Thu Jun 27 00:39:25 2013 +0300
drm/i915: get mode clock when reading the pipe config v9
Cc: Jesse Barnes <jbarnes@xxxxxxxxxxxxxxxx>
Cc: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx>
Signed-off-by: Daniel Vetter <daniel.vetter@xxxxxxxx>
---
drivers/gpu/drm/i915/intel_display.c | 3 +--
1 file changed, 1 insertion(+), 2 deletions(-)
diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index bcb62fe..1da200e 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -7309,8 +7309,7 @@ static void i9xx_crtc_clock_get(struct intel_crtc *crtc,
}
}
- pipe_config->adjusted_mode.clock = clock.dot *
- pipe_config->pixel_multiplier;
+ pipe_config->adjusted_mode.clock = clock.dot;
}
static void ironlake_crtc_clock_get(struct intel_crtc *crtc,
--
1.8.3.1
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