From: Ville Syrjälä <[email protected]> Docs tell us that on g4x we have to compute the SR watermarks using 4 bytes per pixel. I'm going to assume that only applies to 1 and 2 byte per pixel formats, and not 8 byte per pixel formats. That seems like a recipe for an insufficient watermark which could lead to underruns. Use the maximum of the two numbers instead.
Reviewed-by: Maarten Lankhorst <[email protected]> Signed-off-by: Ville Syrjälä <[email protected]> --- drivers/gpu/drm/i915/intel_pm.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c index d10c62d3f10c..87244d8215a7 100644 --- a/drivers/gpu/drm/i915/intel_pm.c +++ b/drivers/gpu/drm/i915/intel_pm.c @@ -1116,6 +1116,8 @@ static u16 g4x_compute_wm(const struct intel_crtc_state *crtc_state, if (!intel_wm_plane_visible(crtc_state, plane_state)) return 0; + cpp = plane_state->base.fb->format->cpp[0]; + /* * Not 100% sure which way ELK should go here as the * spec only says CL/CTG should assume 32bpp and BW @@ -1129,9 +1131,7 @@ static u16 g4x_compute_wm(const struct intel_crtc_state *crtc_state, */ if (IS_GM45(dev_priv) && plane->id == PLANE_PRIMARY && level != G4X_WM_LEVEL_NORMAL) - cpp = 4; - else - cpp = plane_state->base.fb->format->cpp[0]; + cpp = max(cpp, 4u); clock = adjusted_mode->crtc_clock; htotal = adjusted_mode->crtc_htotal; -- 2.21.0 _______________________________________________ Intel-gfx mailing list [email protected] https://lists.freedesktop.org/mailman/listinfo/intel-gfx
