From 8d19d7d9dbc25d1a1ffa602ed9eff25a88c98163 Mon Sep 17 00:00:00 2001 From: "Kumar, Mahesh" Date: Thu, 19 May 2016 15:03:01 -0700 Subject: [PATCH] drm/i915/skl+: Use scaling amount for plane data rate calculation (v4) if downscaling is enabled plane data rate increases according to scaling amount. take scaling amount under consideration while calculating plane data rate v2: Address Matt's comments, where data rate was overridden because of missing else. v3 (by Matt): - Add braces to 'else' branch to match kernel coding style - Adjust final calculation now that skl_plane_downscale_amount() returns 16.16 fixed point value instead of a decimal fixed point v4 (by Matt): - Avoid integer overflow by making sure final multiplication is treated as 64-bit. Cc: matthew.d.roper@intel.com Signed-off-by: Kumar, Mahesh Signed-off-by: Matt Roper Reviewed-by: Kumar Mahesh Link: http://patchwork.freedesktop.org/patch/msgid/1463695381-21368-1-git-send-email-matthew.d.roper@intel.com --- drivers/gpu/drm/i915/intel_pm.c | 13 +++++++++---- 1 file changed, 9 insertions(+), 4 deletions(-) diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c index ceb1eecd..0827459 100644 --- a/drivers/gpu/drm/i915/intel_pm.c +++ b/drivers/gpu/drm/i915/intel_pm.c @@ -2997,6 +2997,7 @@ skl_plane_relative_data_rate(const struct intel_crtc_state *cstate, { struct intel_plane_state *intel_pstate = to_intel_plane_state(pstate); struct drm_framebuffer *fb = pstate->fb; + uint32_t down_scale_amount, data_rate; uint32_t width = 0, height = 0; unsigned format = fb ? fb->pixel_format : DRM_FORMAT_XRGB8888; @@ -3016,15 +3017,19 @@ skl_plane_relative_data_rate(const struct intel_crtc_state *cstate, /* for planar format */ if (format == DRM_FORMAT_NV12) { if (y) /* y-plane data rate */ - return width * height * + data_rate = width * height * drm_format_plane_cpp(format, 0); else /* uv-plane data rate */ - return (width / 2) * (height / 2) * + data_rate = (width / 2) * (height / 2) * drm_format_plane_cpp(format, 1); + } else { + /* for packed formats */ + data_rate = width * height * drm_format_plane_cpp(format, 0); } - /* for packed formats */ - return width * height * drm_format_plane_cpp(format, 0); + down_scale_amount = skl_plane_downscale_amount(intel_pstate); + + return (uint64_t)data_rate * down_scale_amount >> 16; } /* -- 2.7.4