From f2e305108faba0c85eb4ba4066599decb675117e Mon Sep 17 00:00:00 2001 From: Gerd Hoffmann Date: Mon, 25 Jan 2016 12:02:28 +0100 Subject: [PATCH] drm/i915: refine qemu south bridge detection MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit The test for the qemu q35 south bridge added by commit "39bfcd52 drm/i915: more virtual south bridge detection" also matches on real hardware. Having the check for virtual systems last in the list is not enough to avoid that ... Refine the check by additionally verifying the pci subsystem id to see whenever it *really* is qemu. [ v2: fix subvendor tyops ] Reported-and-tested-by: Bjørn Mork Signed-off-by: Gerd Hoffmann Tested-by: Bruno Wolff III Cc: drm-intel-fixes@lists.freedesktop.org Signed-off-by: Jani Nikula Link: http://patchwork.freedesktop.org/patch/msgid/1453719748-10944-1-git-send-email-kraxel@redhat.com (cherry picked from commit 1e859111c128265f8d62b39ff322e42b1ddb5a20) --- drivers/gpu/drm/i915/i915_drv.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/drivers/gpu/drm/i915/i915_drv.c b/drivers/gpu/drm/i915/i915_drv.c index 3ac616d7363b..f357058c74d9 100644 --- a/drivers/gpu/drm/i915/i915_drv.c +++ b/drivers/gpu/drm/i915/i915_drv.c @@ -501,7 +501,9 @@ void intel_detect_pch(struct drm_device *dev) WARN_ON(!IS_SKYLAKE(dev) && !IS_KABYLAKE(dev)); } else if ((id == INTEL_PCH_P2X_DEVICE_ID_TYPE) || - (id == INTEL_PCH_QEMU_DEVICE_ID_TYPE)) { + ((id == INTEL_PCH_QEMU_DEVICE_ID_TYPE) && + pch->subsystem_vendor == 0x1af4 && + pch->subsystem_device == 0x1100)) { dev_priv->pch_type = intel_virt_detect_pch(dev); } else continue;