From b7ec5d55e7488512b4ef2e738d03a8ba76646bfb Mon Sep 17 00:00:00 2001 From: =?utf8?q?Ville=20Syrj=C3=A4l=C3=A4?= Date: Wed, 29 Apr 2020 13:10:23 +0300 Subject: [PATCH] drm/i915/fbc: Require linear fb stride to be multiple of 512 bytes on gen9/glk MIME-Version: 1.0 Content-Type: text/plain; charset=utf8 Content-Transfer-Encoding: 8bit Display WA #1105 says that FBC requires PLANE_STRIDE to be a multiple of 512 bytes on gen9 and glk. This is definitely true for glk as certain tests (such as igt/kms_big_fb/linear-16bpp-rotate-0) are now failing when the display resolution results in a plane stride which is not a multiple of 512 bytes. Curiously I was not able to reproduce this on a KBL. First I suspected that our use of the FBC override stride explain this, but after trying to use the override stride on glk the test still failed. I did try both the old CHICKEN_MISC_4 way and the new FBC_STRIDE way, neither had any effect on the result. Anyways, we need this at least on glk. But let's trust the spec and apply the w/a for all gen9 as well, despite being unable to reproduce the problem. v2: s/FBC_CHICKEN/FBC_STRIDE/ in commit msg Cc: José Roberto de Souza Fixes: f672d1b9ff0c ("drm/i915/display/fbc: Make fences a nice-to-have for GEN9+") Signed-off-by: Ville Syrjälä Link: https://patchwork.freedesktop.org/patch/msgid/20200429101034.8208-2-ville.syrjala@linux.intel.com Reviewed-by: Matt Roper --- drivers/gpu/drm/i915/display/intel_fbc.c | 9 +++++++-- 1 file changed, 7 insertions(+), 2 deletions(-) diff --git a/drivers/gpu/drm/i915/display/intel_fbc.c b/drivers/gpu/drm/i915/display/intel_fbc.c index c6afa10e814c7..7194f9bc62c53 100644 --- a/drivers/gpu/drm/i915/display/intel_fbc.c +++ b/drivers/gpu/drm/i915/display/intel_fbc.c @@ -564,7 +564,7 @@ void intel_fbc_cleanup_cfb(struct drm_i915_private *dev_priv) } static bool stride_is_valid(struct drm_i915_private *dev_priv, - unsigned int stride) + u64 modifier, unsigned int stride) { /* This should have been caught earlier. */ if (drm_WARN_ON_ONCE(&dev_priv->drm, (stride & (64 - 1)) != 0)) @@ -580,6 +580,11 @@ static bool stride_is_valid(struct drm_i915_private *dev_priv, if (IS_GEN(dev_priv, 4) && !IS_G4X(dev_priv) && stride < 2048) return false; + /* Display WA #1105: skl,bxt,kbl,cfl,glk */ + if (IS_GEN(dev_priv, 9) && + modifier == DRM_FORMAT_MOD_LINEAR && stride & 511) + return false; + if (stride > 16384) return false; @@ -810,7 +815,7 @@ static bool intel_fbc_can_activate(struct intel_crtc *crtc) return false; } - if (!stride_is_valid(dev_priv, cache->fb.stride)) { + if (!stride_is_valid(dev_priv, cache->fb.modifier, cache->fb.stride)) { fbc->no_fbc_reason = "framebuffer stride not supported"; return false; } -- 2.39.5