From: "Kumar, Mahesh" <mahesh1.ku...@intel.com>
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.ro...@intel.com
Signed-off-by: Kumar, Mahesh <mahesh1.ku...@intel.com>
Signed-off-by: Matt Roper <matthew.d.ro...@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 5bd885b..7a486e4 100644
--- a/drivers/gpu/drm/i915/intel_pm.c
+++ b/drivers/gpu/drm/i915/intel_pm.c
@@ -2993,6 +2993,7 @@ 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;
@@ -3012,15 +3013,19 @@ 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;
}
/*
--
2.1.4
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