This is a note to let you know that I've just added the patch titled drm/i915: Restore lost DPLL register write on gen2-4 to the 4.2-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: drm-i915-restore-lost-dpll-register-write-on-gen2-4.patch and it can be found in the queue-4.2 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable@xxxxxxxxxxxxxxx> know about it. >From 8e7a65aa70bcc1235a44e40ae0da5056525fe081 Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Ville=20Syrj=C3=A4l=C3=A4?= <ville.syrjala@xxxxxxxxxxxxxxx> Date: Wed, 7 Oct 2015 22:08:24 +0300 Subject: drm/i915: Restore lost DPLL register write on gen2-4 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit From: =?UTF-8?q?Ville=20Syrj=C3=A4l=C3=A4?= <ville.syrjala@xxxxxxxxxxxxxxx> commit 8e7a65aa70bcc1235a44e40ae0da5056525fe081 upstream. We accidentally lost the initial DPLL register write in 1c4e02746147 drm/i915: Fix DVO 2x clock enable on 830M The "three times for luck" hack probably saved us from a total disaster. But anyway, bring the initial write back so that the code actually makes some sense. Reported-and-tested-by: Nick Bowler <nbowler@xxxxxxxxxx> References: http://mid.gmane.org/CAN_QmVyMaArxYgEcVVsGvsMo7-6ohZr8HmF5VhkkL4i9KOmrhw@xxxxxxxxxxxxxx Cc: Nick Bowler <nbowler@xxxxxxxxxx> Signed-off-by: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx> Reviewed-by: Daniel Vetter <daniel.vetter@xxxxxxxx> Signed-off-by: Jani Nikula <jani.nikula@xxxxxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- drivers/gpu/drm/i915/intel_display.c | 2 ++ 1 file changed, 2 insertions(+) --- a/drivers/gpu/drm/i915/intel_display.c +++ b/drivers/gpu/drm/i915/intel_display.c @@ -1729,6 +1729,8 @@ static void i9xx_enable_pll(struct intel I915_READ(DPLL(!crtc->pipe)) | DPLL_DVO_2X_MODE); } + I915_WRITE(reg, dpll); + /* Wait for the clocks to stabilize. */ POSTING_READ(reg); udelay(150); Patches currently in stable-queue which might be from ville.syrjala@xxxxxxxxxxxxxxx are queue-4.2/drm-i915-flush-pipecontrol-post-sync-writes.patch queue-4.2/drm-i915-restore-lost-dpll-register-write-on-gen2-4.patch -- To unsubscribe from this list: send the line "unsubscribe stable" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html