From: Ville Syrjälä ville.syrjala@linux.intel.com
intel_check_clock() can be used to check clock validity w/o modifying hardware state.
Signed-off-by: Ville Syrjälä ville.syrjala@linux.intel.com --- drivers/gpu/drm/i915/i915_drv.h | 2 ++ drivers/gpu/drm/i915/intel_display.c | 34 ++++++++++++++++++++++++++++++++++ 2 files changed, 36 insertions(+), 0 deletions(-)
diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h index ab0bd29..c41982e 100644 --- a/drivers/gpu/drm/i915/i915_drv.h +++ b/drivers/gpu/drm/i915/i915_drv.h @@ -1719,6 +1719,8 @@ extern bool intel_fbc_enabled(struct drm_device *dev); extern void intel_disable_fbc(struct drm_device *dev); extern bool ironlake_set_drps(struct drm_device *dev, u8 val); extern void intel_init_pch_refclk(struct drm_device *dev); +extern int intel_check_clock(struct drm_crtc *crtc, + const struct drm_display_mode *adjusted_mode); extern void gen6_set_rps(struct drm_device *dev, u8 val); extern void intel_detect_pch(struct drm_device *dev); extern int intel_trans_dp_port_sel(struct drm_crtc *crtc); diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c index 2a2c664..dcd61fb 100644 --- a/drivers/gpu/drm/i915/intel_display.c +++ b/drivers/gpu/drm/i915/intel_display.c @@ -5686,6 +5686,40 @@ static int haswell_crtc_mode_set(struct drm_crtc *crtc, return ret; }
+int intel_check_clock(struct drm_crtc *crtc, + const struct drm_display_mode *adjusted_mode) +{ + struct drm_device *dev = crtc->dev; + intel_clock_t clock, reduced_clock; + bool has_reduced_clock = false; + bool ok; + + if (IS_HASWELL(dev)) { + if (!intel_ddi_pll_mode_set(crtc, adjusted_mode->clock)) + return -EINVAL; + + if (HAS_PCH_IBX(dev) || HAS_PCH_CPT(dev)) { + ok = ironlake_compute_clocks(crtc, adjusted_mode, &clock, + &has_reduced_clock, + &reduced_clock); + } else + ok = true; + } else if (HAS_PCH_SPLIT(dev)) { + ok = ironlake_compute_clocks(crtc, adjusted_mode, &clock, + &has_reduced_clock, &reduced_clock); + } else { + int num_connectors = 0; + bool is_dp = false; + int refclk; + + ok = i9xx_compute_clocks(crtc, adjusted_mode, &clock, + &has_reduced_clock, &reduced_clock, + &refclk, &num_connectors, &is_dp); + } + + return ok ? 0 : -EINVAL; +} + static int intel_crtc_mode_set(struct drm_crtc *crtc, struct drm_display_mode *mode, struct drm_display_mode *adjusted_mode,