This is a note to let you know that I've just added the patch titled
drm/i915/vlv: save/restore the power context base reg
to the 3.19-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-vlv-save-restore-the-power-context-base-reg.patch
and it can be found in the queue-3.19 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 9c25210fd30991e68f93e2ec0857de2d967b5766 Mon Sep 17 00:00:00 2001
From: Jesse Barnes <jbarnes@xxxxxxxxxxxxxxxx>
Date: Wed, 1 Apr 2015 14:22:57 -0700
Subject: drm/i915/vlv: save/restore the power context base reg
From: Jesse Barnes <jbarnes@xxxxxxxxxxxxxxxx>
commit 9c25210fd30991e68f93e2ec0857de2d967b5766 upstream.
Some BIOSes (e.g. the one on the Minnowboard) don't save/restore this
reg. If it's unlocked, we can just restore the previous value, and if
it's locked (in case the BIOS re-programmed it for us) the write will be
ignored and we'll still have "did it move" sanity check in the PM code to
warn us if something is still amiss.
References: https://bugs.freedesktop.org/show_bug.cgi?id=89611
Signed-off-by: Jesse Barnes <jbarnes@xxxxxxxxxxxxxxxx>
Tested-by: Darren Hart <dvhart@xxxxxxxxxxxxxxx>
Reviewed-by: Imre Deak <imre.deak@xxxxxxxxx>
Reviewed-by: Deepak S <deepak.s@xxxxxxxxxxxxxxx>
Signed-off-by: Jani Nikula <jani.nikula@xxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/gpu/drm/i915/i915_drv.c | 2 ++
drivers/gpu/drm/i915/i915_drv.h | 1 +
2 files changed, 3 insertions(+)
--- a/drivers/gpu/drm/i915/i915_drv.c
+++ b/drivers/gpu/drm/i915/i915_drv.c
@@ -1093,6 +1093,7 @@ static void vlv_save_gunit_s0ix_state(st
/* Gunit-Display CZ domain, 0x182028-0x1821CF */
s->gu_ctl0 = I915_READ(VLV_GU_CTL0);
s->gu_ctl1 = I915_READ(VLV_GU_CTL1);
+ s->pcbr = I915_READ(VLV_PCBR);
s->clock_gate_dis2 = I915_READ(VLV_GUNIT_CLOCK_GATE2);
/*
@@ -1187,6 +1188,7 @@ static void vlv_restore_gunit_s0ix_state
/* Gunit-Display CZ domain, 0x182028-0x1821CF */
I915_WRITE(VLV_GU_CTL0, s->gu_ctl0);
I915_WRITE(VLV_GU_CTL1, s->gu_ctl1);
+ I915_WRITE(VLV_PCBR, s->pcbr);
I915_WRITE(VLV_GUNIT_CLOCK_GATE2, s->clock_gate_dis2);
}
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -985,6 +985,7 @@ struct vlv_s0ix_state {
/* Display 2 CZ domain */
u32 gu_ctl0;
u32 gu_ctl1;
+ u32 pcbr;
u32 clock_gate_dis2;
};
Patches currently in stable-queue which might be from jbarnes@xxxxxxxxxxxxxxxx are
queue-3.19/drm-i915-vlv-remove-wait-for-previous-gfx-clk-disable-request.patch
queue-3.19/drm-i915-vlv-save-restore-the-power-context-base-reg.patch
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