Stefan Reinauer (stefan.reinauer@coreboot.org) just uploaded a new patch set to gerrit, which you can find at http://review.coreboot.org/9464
-gerrit
commit ce71ab338ccb1bdf534dc6aed9dad864b6ded93d Author: Duncan Laurie dlaurie@chromium.org Date: Thu Oct 9 16:13:24 2014 -0700
broadwell: Work around VBIOS framebuffer issue
The first 64 bytes of the framebuffer contain garbage after running the option rom and after calling the VBE mode set with the flag to clear the framebuffer.
Work around this issue by clearing the first 64 bytes in the framebuffer in the broadwell graphics setup code after it executes the VBIOS.
BUG=chrome-os-partner:32771 BRANCH=samus,auron TEST=build and boot on samus in dev mode, check for graphical corruption
Change-Id: I0381e32a5ea17e13c4ed598835999c12136418cf Signed-off-by: Stefan Reinauer reinauer@chromium.org Original-Commit-Id: f29c1b0b7c100cf290f82de671042823032f71c9 Original-Change-Id: I072bc913f7daea16e4861a7549e1b4ec85cde4cd Original-Signed-off-by: Duncan Laurie dlaurie@chromium.org Original-Reviewed-on: https://chromium-review.googlesource.com/222676 Original-Reviewed-by: Aaron Durbin adurbin@chromium.org --- src/soc/intel/broadwell/igd.c | 9 +++++++++ 1 file changed, 9 insertions(+)
diff --git a/src/soc/intel/broadwell/igd.c b/src/soc/intel/broadwell/igd.c index d8b51a3..41a6961 100644 --- a/src/soc/intel/broadwell/igd.c +++ b/src/soc/intel/broadwell/igd.c @@ -523,6 +523,15 @@ static void igd_init(struct device *dev) reg_script_run_on_dev(dev, haswell_late_init_script); }
+ if (gfx_get_init_done()) { + /* + * Work around VBIOS issue that is not clearing first 64 + * bytes of the framebuffer during VBE mode set. + */ + struct resource *fb = find_resource(dev, PCI_BASE_ADDRESS_2); + memset((void *)((u32)fb->base), 0, 64); + } + if (!gfx_get_init_done() && acpi_slp_type != 3) { /* * Enable DDI-A if the Option ROM did not execute: