Commit 6f13b7b5 authored by Chris Wilson's avatar Chris Wilson Committed by Daniel Vetter
Browse files

drm/i915: Enable the PCH PLL for all generations after link training

Hidden away within one chipset specific path was the necessary logic to
turn on the PLL. This needs to be done everywhere in order for us to
drive any display! As such as soon as we tested on a non-CougarPoint
chipset, we failed to bring up any DisplayPorts and generated a nice set
of assertion failures in the process. At least one part of our logic is
working, the part that assumes that we have no idea what we are doing.

Reported-by: default avatar <>

Signed-off-by: default avatarChris Wilson <>
Reviewed-by: default avatarJesse Barnes <>
Signed-off-by: default avatarDaniel Vetter <>
parent 48da64a8
......@@ -2796,14 +2796,14 @@ static void ironlake_pch_enable(struct drm_crtc *crtc)
/* For PCH output, training FDI link */
if (HAS_PCH_LPT(dev)) {
DRM_DEBUG_KMS("LPT detected: programming iCLKIP\n");
} else if (HAS_PCH_CPT(dev)) {
u32 sel;
temp = I915_READ(PCH_DPLL_SEL);
switch (pipe) {
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