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drm/i915/pfit: Check pfit scaling factors on ILK-BDW

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Make sure we're not exceeding the max scaling factors for the panel
fitter on ILK-BDW. SKL+ is skipped here since this is all supposed to
be handled by the unified scaler code.

Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20241016143134.26903-3-ville.syrjala@linux.intel.com
Acked-by: Jani Nikula <jani.nikula@intel.com>
This commit is contained in:
Ville Syrjälä 2024-10-16 17:31:27 +03:00
parent b82adfca19
commit 8aa0e51719
1 changed files with 39 additions and 0 deletions
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39
drivers/gpu/drm/i915/display/intel_panel.c
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@ -421,6 +421,41 @@ static int intel_pch_pfit_check_src_size(const struct intel_crtc_state *crtc_sta
return 0;
}
static int intel_pch_pfit_check_scaling(const struct intel_crtc_state *crtc_state)
{
struct intel_display *display = to_intel_display(crtc_state);
struct intel_crtc *crtc = to_intel_crtc(crtc_state->uapi.crtc);
const struct drm_rect *dst = &crtc_state->pch_pfit.dst;
int pipe_src_w = drm_rect_width(&crtc_state->pipe_src);
int pipe_src_h = drm_rect_height(&crtc_state->pipe_src);
int hscale, vscale, max_scale = 0x12000; /* 1.125 */
struct drm_rect src;
drm_rect_init(&src, 0, 0, pipe_src_w << 16, pipe_src_h << 16);
hscale = drm_rect_calc_hscale(&src, dst, 0, max_scale);
if (hscale < 0) {
drm_dbg_kms(display->drm,
"[CRTC:%d:%s] pfit horizontal downscaling (%d->%d) exceeds max (0x%x)\n",
crtc->base.base.id, crtc->base.name,
pipe_src_w, drm_rect_width(dst),
max_scale);
return hscale;
}
vscale = drm_rect_calc_vscale(&src, dst, 0, max_scale);
if (vscale < 0) {
drm_dbg_kms(display->drm,
"[CRTC:%d:%s] pfit vertical downscaling (%d->%d) exceeds max (0x%x)\n",
crtc->base.base.id, crtc->base.name,
pipe_src_h, drm_rect_height(dst),
max_scale);
return vscale;
}
return 0;
}
/* adjusted_mode has been preset to be the panel's fixed mode */
static int pch_panel_fitting(struct intel_crtc_state *crtc_state,
const struct drm_connector_state *conn_state)
@ -503,6 +538,10 @@ static int pch_panel_fitting(struct intel_crtc_state *crtc_state,
if (ret)
return ret;
ret = intel_pch_pfit_check_scaling(crtc_state);
if (ret)
return ret;
return 0;
}