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gma500_gfx: Avoid inserting gma500_gfx module for certain devices 

The gma500_gfx driver will match certain devices on which it causes incorrect functionality,
we want to avoid inserting this module, basicallly blacklist it for specific hardware,
but still allow it to work on other hardware by default; usually when we have an already working system,
using udev rules would do the job, but since we are building it, it is impossible to blacklist
a driver when a certain udev rule matches, since rootfs isn't writeable at this point during boot time,
the solution is to use modprobe install, which runs a certain command instead of inserting a matching module,
this command needs to insert the module manually afterwards and have a flag --ignore-install
so it doesnt create an infinite loop executing itself everytime it wants to insert the module,
busybox's modprobe doesn't provide this functionality, so a small hack had to be used to avoid
the infite loop instead.

(From meta-yocto rev: 70c143767a8b63921e668a62ac463b3a6b8c6132)

Signed-off-by: Alejandro Hernandez <alejandro.hernandez@linux.intel.com>
Signed-off-by: Ross Burton <ross.burton@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
This commit is contained in:
Alejandro Hernandez 2015-11-09 16:11:57 +00:00 committed by Richard Purdie
parent 6c3f68039d
commit c4acacefc1
4 changed files with 33 additions and 0 deletions
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2
meta-yocto-bsp/conf/machine/genericx86.conf
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@ -6,3 +6,5 @@
DEFAULTTUNE ?= "core2-32"
require conf/machine/include/tune-core2.inc
require conf/machine/include/genericx86-common.inc
MACHINE_ESSENTIAL_EXTRA_RRECOMMENDS += "gma500-gfx-check"

2
meta-yocto-bsp/recipes-bsp/gma500-gfx-check/gma500-gfx-check/gma500-gfx-check.conf Normal file
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@ -0,0 +1,2 @@
# Mimic modprobe's install funcitonality with busybox's modprobe
install gma500_gfx lsmod | grep gma || { gma500_gfx_check.sh || modprobe gma500_gfx; }

11
meta-yocto-bsp/recipes-bsp/gma500-gfx-check/gma500-gfx-check/gma500-gfx-check.sh Normal file
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@ -0,0 +1,11 @@
#!/bin/sh
# Check for devices we wish to avoid gma500_gfx for
DEVICES="0x8119 0x4108"
for DEVICE in $DEVICES; do
if udevadm trigger --subsystem-match=pci --verbose --attr-match=device=$DEVICE | grep "pci" >> /dev/null ; then
echo "Found $DEVICE, avoiding gma500_gfx module" >> /dev/kmsg;
exit 0
fi
done
exit 1

18
meta-yocto-bsp/recipes-bsp/gma500-gfx-check/gma500-gfx-check_1.0.bb Normal file
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@ -0,0 +1,18 @@
SUMMARY = "Intel gma500_gfx fix for certain hardware"
DESCRIPTION = "Avoid inserting gma500_gfx module for certain hardware devices."
LICENSE="GPLv2"
LIC_FILES_CHKSUM = "file://${COREBASE}/meta/files/common-licenses/GPL-2.0;md5=801f80980d171dd6425610833a22dbe6"
SRC_URI = "file://gma500-gfx-check.conf \
file://gma500-gfx-check.sh "
do_install(){
install -d ${D}${sysconfdir}/modprobe.d/
install -m 755 ${WORKDIR}/gma500-gfx-check.sh ${D}${sysconfdir}/modprobe.d/gma500-gfx-check.sh
install -m 644 ${WORKDIR}/gma500-gfx-check.conf ${D}${sysconfdir}/modprobe.d/gma500-gfx-check.conf
}
FILES_${PN}="${sysconfdir}/modprobe.d/gma500-gfx-check.conf \
${sysconfdir}/modprobe.d/gma500-gfx-check.sh"
COMPATIBLE_MACHINE = "genericx86"