The patch below does not apply to the 4.18-stable tree. If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to stable@vger.kernel.org.

thanks,

greg k-h

------------------ original commit in Linus's tree ------------------

From d9a515867bdba59ebf196a6ade10faae8e8be36a Mon Sep 17 00:00:00 2001

From: Imre Deak imre.deak@intel.com Date: Tue, 16 Oct 2018 19:00:11 +0300 Subject: [PATCH] drm/i915/gen9+: Fix initial readout for Y tiled framebuffers MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit

If BIOS configured a Y tiled FB we failed to set up the backing object tiling accordingly, leading to a lack of GT fence installed and a garbled console.

The problem was bisected to commit 011f22eb545a ("drm/i915: Do NOT skip the first 4k of stolen memory for pre-allocated buffers v2") but it just revealed a pre-existing issue.

Kudos to Ville who suspected a missing fence looking at the corruption on the screen.

Cc: Ville Syrjälä ville.syrjala@linux.intel.com Cc: Mika Westerberg mika.westerberg@linux.intel.com Cc: Hans de Goede hdegoede@redhat.com Cc: ronald@innovation.ch Cc: stable@vger.kernel.org Reported-by: Mika Westerberg mika.westerberg@linux.intel.com Reported-by: ronald@innovation.ch Tested-by: ronald@innovation.ch Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=108264 Fixes: bc8d7dffacb1 ("drm/i915/skl: Provide a Skylake version of get_plane_config()") Signed-off-by: Imre Deak imre.deak@intel.com Reviewed-by: Ville Syrjälä ville.syrjala@linux.intel.com Link: https://patchwork.freedesktop.org/patch/msgid/20181016160011.28347-1-imre.de... (cherry picked from commit 914a4fd8cd28016038ce749a818a836124a8d270) Signed-off-by: Rodrigo Vivi rodrigo.vivi@intel.com

diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c index 1025d58ea1e8..3cd813c21af1 100644 --- a/drivers/gpu/drm/i915/intel_display.c +++ b/drivers/gpu/drm/i915/intel_display.c @@ -2722,6 +2722,17 @@ intel_alloc_initial_plane_obj(struct intel_crtc *crtc, if (size_aligned * 2 > dev_priv->stolen_usable_size) return false;

+ switch (fb->modifier) { + case DRM_FORMAT_MOD_LINEAR: + case I915_FORMAT_MOD_X_TILED: + case I915_FORMAT_MOD_Y_TILED: + break; + default: + DRM_DEBUG_DRIVER("Unsupported modifier for initial FB: 0x%llx\n", + fb->modifier); + return false; + } + mutex_lock(&dev->struct_mutex); obj = i915_gem_object_create_stolen_for_preallocated(dev_priv, base_aligned, @@ -2731,8 +2742,17 @@ intel_alloc_initial_plane_obj(struct intel_crtc *crtc, if (!obj) return false;

- if (plane_config->tiling == I915_TILING_X) - obj->tiling_and_stride = fb->pitches[0] | I915_TILING_X; + switch (plane_config->tiling) { + case I915_TILING_NONE: + break; + case I915_TILING_X: + case I915_TILING_Y: + obj->tiling_and_stride = fb->pitches[0] | plane_config->tiling; + break; + default: + MISSING_CASE(plane_config->tiling); + return false; + }

mode_cmd.pixel_format = fb->format->format; mode_cmd.width = fb->width; @@ -8865,6 +8885,7 @@ skylake_get_initial_plane_config(struct intel_crtc *crtc, fb->modifier = I915_FORMAT_MOD_X_TILED; break; case PLANE_CTL_TILED_Y: + plane_config->tiling = I915_TILING_Y; if (val & PLANE_CTL_RENDER_DECOMPRESSION_ENABLE) fb->modifier = I915_FORMAT_MOD_Y_TILED_CCS; else