diff options
| -rw-r--r-- | drivers/gpu/drm/i915/display/intel_crtc.c | 11 | ||||
| -rw-r--r-- | drivers/gpu/drm/i915/display/intel_crtc.h | 2 |
2 files changed, 13 insertions, 0 deletions
diff --git a/drivers/gpu/drm/i915/display/intel_crtc.c b/drivers/gpu/drm/i915/display/intel_crtc.c index 3a28d8450a38..8ed8dd5fe458 100644 --- a/drivers/gpu/drm/i915/display/intel_crtc.c +++ b/drivers/gpu/drm/i915/display/intel_crtc.c @@ -483,6 +483,17 @@ int intel_usecs_to_scanlines(const struct drm_display_mode *adjusted_mode, 1000 * adjusted_mode->crtc_htotal); } +int intel_scanlines_to_usecs(const struct drm_display_mode *adjusted_mode, + int scanlines) +{ + /* paranoia */ + if (!adjusted_mode->crtc_clock) + return 1; + + return DIV_ROUND_UP_ULL(mul_u32_u32(scanlines, adjusted_mode->crtc_htotal * 1000), + adjusted_mode->crtc_clock); +} + /** * intel_pipe_update_start() - start update of a set of display registers * @state: the atomic state diff --git a/drivers/gpu/drm/i915/display/intel_crtc.h b/drivers/gpu/drm/i915/display/intel_crtc.h index a58ecd11bba2..34ffbd2ee1b7 100644 --- a/drivers/gpu/drm/i915/display/intel_crtc.h +++ b/drivers/gpu/drm/i915/display/intel_crtc.h @@ -31,6 +31,8 @@ struct intel_display; int intel_usecs_to_scanlines(const struct drm_display_mode *adjusted_mode, int usecs); +int intel_scanlines_to_usecs(const struct drm_display_mode *adjusted_mode, + int scanlines); void intel_crtc_arm_vblank_event(struct intel_crtc_state *crtc_state); u32 intel_crtc_max_vblank_count(const struct intel_crtc_state *crtc_state); int intel_crtc_init(struct drm_i915_private *dev_priv, enum pipe pipe); |