[linux-yocto] [PATCH] drm/i915/cfl: Coffee Lake works on Kaby Lake PCH.

Liwei Song liwei.song at windriver.com
Mon Mar 5 00:53:05 PST 2018

From: Rodrigo Vivi <rodrigo.vivi at intel.com>

commit eb371933cf4d3495d0899880b2e0e252ce9db517 upstream.

Coffee Lake CPU on Kaby Lake PCH is possible.
It does exist, and it does work.

The only missed case was this warning here noticed
by Wendy who could get one system with this configuration
and reported the issue for us:

Hardware Configuration
Processor    Intel® Processor code named Coffee Lake S, (6+2), 6 cores 12 threads, GT2, A0 (Internal) (QNJ4)

[ 3.220585] WARNING: CPU: 10 PID: 206 at drivers/gpu/drm/i915/i915_drv.c:340 i915_driver_load+0x1210/0x1660 [i915]
[ 3.221312] Modules linked in: hid_generic usbhid i915 i2c_algo_bit drm_kms_helper e1000e syscopyarea sysfillrect sysimgblt nvme fb_sys_fops ptp ahci i2c_hid drm pps_core nvme_core libahci wmi hid video
[ 3.222050] CPU: 10 PID: 206 Comm: systemd-udevd Not tainted 4.13.0-rc5-intel-next+ #1
[ 3.222706] Hardware name: Intel Corporation Kabylake Client platform/KBL S DDR4 UDIMM EV CRB, BIOS KBLSE2R1.R00.X089.P00.1705051000 05/05/2017

Cc: Wendy Wang <wendy.wang at intel.com>
Cc: Dhinakaran Pandiyan <dhinakaran.pandiyan at intel.com>
Signed-off-by: Rodrigo Vivi <rodrigo.vivi at intel.com>
Reviewed-by: Dhinakaran Pandiyan <dhinakaran.pandiyan at intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20170821235056.9015-1-rodrigo.vivi@intel.com
Signed-off-by: Liwei Song <liwei.song at windriver.com>
 drivers/gpu/drm/i915/i915_drv.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/i915/i915_drv.c b/drivers/gpu/drm/i915/i915_drv.c
index 19ffb3439fa9..bb7a4d92db60 100644
--- a/drivers/gpu/drm/i915/i915_drv.c
+++ b/drivers/gpu/drm/i915/i915_drv.c
@@ -221,7 +221,8 @@ static void intel_detect_pch(struct drm_i915_private *dev_priv)
 				dev_priv->pch_type = PCH_KBP;
 				DRM_DEBUG_KMS("Found KabyPoint PCH\n");
 				WARN_ON(!IS_SKYLAKE(dev_priv) &&
-					!IS_KABYLAKE(dev_priv));
+					!IS_KABYLAKE(dev_priv) &&
+					!IS_COFFEELAKE(dev_priv));
 			} else if (id == INTEL_PCH_CNP_DEVICE_ID_TYPE) {
 				dev_priv->pch_type = PCH_CNP;
 				DRM_DEBUG_KMS("Found CannonPoint PCH\n");

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