From: Daniel Vetter Date: Tue, 3 May 2016 08:33:01 +0000 (+0200) Subject: drm/i915: Bail out of pipe config compute loop on LPT X-Git-Tag: v4.8-rc1~62^2~45^2~114 X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=f58a1acc7e4a1f37d26124ce4c875c647fbcc61f;p=karo-tx-linux.git drm/i915: Bail out of pipe config compute loop on LPT LPT is pch, so might run into the fdi bandwidth constraint (especially since it has only 2 lanes). But right now we just force pipe_bpp back to 24, resulting in a nice loop (which we bail out with a loud WARN_ON). Fix this. Cc: Chris Wilson Cc: Maarten Lankhorst References: https://bugs.freedesktop.org/show_bug.cgi?id=93477 Signed-off-by: Daniel Vetter Tested-by: Chris Wilson Signed-off-by: Maarten Lankhorst Cc: stable@vger.kernel.org Signed-off-by: Daniel Vetter Link: http://patchwork.freedesktop.org/patch/msgid/1462264381-7573-1-git-send-email-daniel.vetter@ffwll.ch --- diff --git a/drivers/gpu/drm/i915/intel_crt.c b/drivers/gpu/drm/i915/intel_crt.c index a2a31fd01d1d..3fbb6fc66451 100644 --- a/drivers/gpu/drm/i915/intel_crt.c +++ b/drivers/gpu/drm/i915/intel_crt.c @@ -261,8 +261,14 @@ static bool intel_crt_compute_config(struct intel_encoder *encoder, pipe_config->has_pch_encoder = true; /* LPT FDI RX only supports 8bpc. */ - if (HAS_PCH_LPT(dev)) + if (HAS_PCH_LPT(dev)) { + if (pipe_config->bw_constrained && pipe_config->pipe_bpp < 24) { + DRM_DEBUG_KMS("LPT only supports 24bpp\n"); + return false; + } + pipe_config->pipe_bpp = 24; + } /* FDI must always be 2.7 GHz */ if (HAS_DDI(dev))