From ad3a44799510e778a6b4bf7999618634bdd6615d Mon Sep 17 00:00:00 2001 From: =?utf8?q?Ville=20Syrj=C3=A4l=C3=A4?= Date: Wed, 4 Sep 2013 18:30:04 +0300 Subject: [PATCH] drm/i915: Check pixel clock limits on pre-gen4 MIME-Version: 1.0 Content-Type: text/plain; charset=utf8 Content-Transfer-Encoding: 8bit We don't want to try to push the hardware beyond it's capabilities, so check the pixel clock against the display core clock limit. Do it for pre-gen4 for now since that's where we alread have the double wide pixel clock limit check. Let's assume that when double wide mode is enabled the max pixel clock limit is also doubled. FIXME: panel fitter downscaling probably affects the limit on non-pch platforms too, so we'd need another version of ilk_pipe_pixel_rate() to figure that out. FIXME: should check the limits on all platforms. Also sprites affect the max allowed pixel rate on some platforms, so we need to eventually tie all the planes and pipes into one check in the future. But we need plane state pre-compute before that can happen. Signed-off-by: Ville Syrjälä Signed-off-by: Daniel Vetter --- drivers/gpu/drm/i915/intel_display.c | 8 +++++++- 1 file changed, 7 insertions(+), 1 deletion(-) diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c index d01a800f8a36..91631bf354e6 100644 --- a/drivers/gpu/drm/i915/intel_display.c +++ b/drivers/gpu/drm/i915/intel_display.c @@ -4143,6 +4143,7 @@ static int intel_crtc_compute_config(struct intel_crtc *crtc, struct drm_device *dev = crtc->base.dev; struct drm_display_mode *adjusted_mode = &pipe_config->adjusted_mode; + /* FIXME should check pixel clock limits on all platforms */ if (INTEL_INFO(dev)->gen < 4) { struct drm_i915_private *dev_priv = dev->dev_private; int clock_limit = @@ -4156,8 +4157,13 @@ static int intel_crtc_compute_config(struct intel_crtc *crtc, * the only reason for the pipe == PIPE_A check? */ if (crtc->pipe == PIPE_A && - adjusted_mode->clock > clock_limit * 9 / 10) + adjusted_mode->clock > clock_limit * 9 / 10) { + clock_limit *= 2; pipe_config->double_wide = true; + } + + if (adjusted_mode->clock > clock_limit * 9 / 10) + return -EINVAL; } /* Cantiga+ cannot handle modes with a hsync front porch of 0. -- 2.20.1