On Fri, Mar 19, 2021 at 10:39:30AM +0100, Greg KH wrote:
On Wed, Mar 17, 2021 at 10:55:02AM +0800, Colin Xu wrote:
commit a5a8ef937cfa79167f4b2a5602092b8d14fd6b9a upstream
Program display related vregs to proper value at initialization, setup virtual monitor and hotplug.
vGPU virtual display vregs inherit the value from pregs. The virtual DP monitor is always setup on PORT_B for BXT/APL. However the host may connect monitor on other PORT or without any monitor connected. Without properly setup PIPE/DDI/PLL related vregs, guest driver may not setup the virutal display as expected, and the guest desktop may not be created. Since only one virtual display is supported, enable PIPE_A only. And enable transcoder/DDI/PLL based on which port is setup for BXT/APL.
V2: Revise commit message.
V3: set_edid should on PORT_B for BXT. Inject hpd event for BXT.
V4: Temporarily disable vfio edid on BXT/APL until issue fixed.
V5: Rebase to use new HPD define GEN8_DE_PORT_HOTPLUG for BXT. Put vfio edid disabling on BXT/APL to a separate patch.
Acked-by: Zhenyu Wang zhenyuw@linux.intel.com Signed-off-by: Colin Xu colin.xu@intel.com Signed-off-by: Zhenyu Wang zhenyuw@linux.intel.com Link: http://patchwork.freedesktop.org/patch/msgid/20201109073922.757759-1-colin.x... (cherry picked from commit a5a8ef937cfa79167f4b2a5602092b8d14fd6b9a) Signed-off-by: Colin Xu colin.xu@intel.com Cc: stable@vger.kernel.org # 5.4.y
drivers/gpu/drm/i915/gvt/display.c | 173 +++++++++++++++++++++++++++++ drivers/gpu/drm/i915/gvt/mmio.c | 5 + 2 files changed, 178 insertions(+)
I've taken this backport for 5.10.y as well, because it is missing there.
Oops, nope, it breaks the build.
Please also provide a working backport for this as well, we can not have users moving to a newer kernel version and have a regression for a known issue.
thanks,
greg k-h