xserver-xorg: import distro patch to use modesetting driver on newer hardware

Debian and Fedora both carry this patch, and the xf86-video-modesetting
driver seems better on recent hardware.

As an example, on a NUC6CAYS, the x11perf -aa10text and -rgb10text tests
see around a 20x increase.

[YOCTO #12019]
[YOCTO #12390]

(From OE-Core rev: 2e4934d5d4b2745ffcd76020b307b9021f8d8853)

Signed-off-by: California Sullivan <california.l.sullivan@intel.com>
Signed-off-by: Ross Burton <ross.burton@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/recipes-graphics/xorg-xserver/xserver-xorg/0001-xf86pciBus.c-use-Intel-ddx-only-for-pre-gen4-hardwar.patch

@@ -0,0 +1,53 @@
+From d77cdc5e1eee26821ab98c947abea53fb7b18fe5 Mon Sep 17 00:00:00 2001
+From: California Sullivan <california.l.sullivan@intel.com>
+Date: Fri, 16 Mar 2018 17:23:11 -0700
+Subject: [PATCH] xf86pciBus.c: use Intel ddx only for pre-gen4 hardware
+
+Use intel ddx only on pre-gen4 hw, newer ones will fall back to modesetting
+Author: Timo Aaltonen <tjaalton@debian.org>
+
+Instead of defaulting to the Intel driver for all Intel hardware, only
+default it for older hardware for which it has shown to be better for.
+
+Others fall through to the -modesetting default.
+
+Upstream-Status: Pending [Debian/Fedora patch
+https://src.fedoraproject.org/rpms/xorg-x11-server/c/ee515e44b07e37689abf48cf2fffb41578f3bc1d]
+
+Signed-off-by: California Sullivan <california.l.sullivan@intel.com>
+---
+ hw/xfree86/common/xf86pciBus.c | 18 +++++++++++++++++-
+ 1 file changed, 17 insertions(+), 1 deletion(-)
+
+diff --git a/hw/xfree86/common/xf86pciBus.c b/hw/xfree86/common/xf86pciBus.c
+index e61ae0cd4..d70c99197 100644
+--- a/hw/xfree86/common/xf86pciBus.c
++++ b/hw/xfree86/common/xf86pciBus.c
+@@ -1173,7 +1173,23 @@ xf86VideoPtrToDriverList(struct pci_device *dev,
+ 		case 0x0bef:
+ 			/* Use fbdev/vesa driver on Oaktrail, Medfield, CDV */
+ 			break;
+-		default:
++		/* Default to intel only on pre-gen4 chips */
++		case 0x3577:
++		case 0x2562:
++		case 0x3582:
++		case 0x358e:
++		case 0x2572:
++		case 0x2582:
++		case 0x258a:
++		case 0x2592:
++		case 0x2772:
++		case 0x27a2:
++		case 0x27ae:
++		case 0x29b2:
++		case 0x29c2:
++		case 0x29d2:
++		case 0xa001:
++		case 0xa011:
+ 			driverList[0] = "intel";
+ 			break;
+         }
+-- 
+2.14.3
+

meta/recipes-graphics/xorg-xserver/xserver-xorg_1.19.6.bb

@@ -4,6 +4,7 @@ SRC_URI += "file://musl-arm-inb-outb.patch \
             file://0001-configure.ac-Fix-check-for-CLOCK_MONOTONIC.patch \
             file://0003-modesetting-Fix-16-bit-depth-bpp-mode.patch \
             file://0003-Remove-check-for-useSIGIO-option.patch \
+            file://0001-xf86pciBus.c-use-Intel-ddx-only-for-pre-gen4-hardwar.patch \
             "
 SRC_URI[md5sum] = "3e47777ff034a331aed2322b078694a8"
 SRC_URI[sha256sum] = "a732502f1db000cf36a376cd0c010ffdbf32ecdd7f1fa08ba7f5bdf9601cc197"