This is a note to let you know that I've just added the patch titled
drm/i915: Move init_clock_gating() back to where it was
to the 4.14-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-move-init_clock_gating-back-to-where-it-was.patch
and it can be found in the queue-4.14 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 6ac43272768ca901daac4076a66c2c4e3c7b9321 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Ville=20Syrj=C3=A4l=C3=A4?= <ville.syrjala@xxxxxxxxxxxxxxx>
Date: Wed, 8 Nov 2017 15:35:55 +0200
Subject: drm/i915: Move init_clock_gating() back to where it was
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From: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx>
commit 6ac43272768ca901daac4076a66c2c4e3c7b9321 upstream.
Apparently setting up a bunch of GT registers before we've properly
initialized the rest of the GT hardware leads to these setting being
lost. So looks like I broke HSW with commit b7048ea12fbb ("drm/i915:
Do .init_clock_gating() earlier to avoid it clobbering watermarks")
by doing init_clock_gating() too early. This should actually affect
other platforms as well, but apparently not to such a great degree.
What I was ultimately after in that commit was to move the
ilk_init_lp_watermarks() call earlier. So let's undo the damage and
move init_clock_gating() back to where it was, and call
ilk_init_lp_watermarks() just before the watermark state readout.
This highlights how fragile and messed up our init order really is.
I wonder why we even initialize the display before gem. The opposite
order would make much more sense to me...
v2: Keep WaRsPkgCStateDisplayPMReq:hsw early as it really must
be done before all planes might get disabled.
Cc: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
Cc: Mark Janes <mark.a.janes@xxxxxxxxx>
Cc: Maarten Lankhorst <maarten.lankhorst@xxxxxxxxxxxxxxx>
Cc: Daniel Vetter <daniel.vetter@xxxxxxxx>
Cc: Joonas Lahtinen <joonas.lahtinen@xxxxxxxxxxxxxxx>
Cc: Oscar Mateo <oscar.mateo@xxxxxxxxx>
Cc: Mika Kuoppala <mika.kuoppala@xxxxxxxxxxxxxxx>
Reported-by: Mark Janes <mark.a.janes@xxxxxxxxx>
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=103549
Fixes: b7048ea12fbb ("drm/i915: Do .init_clock_gating() earlier to avoid it clobbering watermarks")
References: https://lists.freedesktop.org/archives/intel-gfx/2017-November/145432.html
Signed-off-by: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx>
Link: https://patchwork.freedesktop.org/patch/msgid/20171108133555.14091-1-ville.syrjala@xxxxxxxxxxxxxxx
Tested-by: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
Reviewed-by: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
(cherry picked from commit f72b84c677d61f201b869223a8d6e389c7bb7d3d)
Signed-off-by: Jani Nikula <jani.nikula@xxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/gpu/drm/i915/intel_display.c | 14 +++++++++--
drivers/gpu/drm/i915/intel_pm.c | 44 ++++++++++++++---------------------
2 files changed, 30 insertions(+), 28 deletions(-)
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -3800,6 +3800,7 @@ void intel_finish_reset(struct drm_i915_
intel_pps_unlock_regs_wa(dev_priv);
intel_modeset_init_hw(dev);
+ intel_init_clock_gating(dev_priv);
spin_lock_irq(&dev_priv->irq_lock);
if (dev_priv->display.hpd_irq_setup)
@@ -14406,8 +14407,6 @@ void intel_modeset_init_hw(struct drm_de
intel_update_cdclk(dev_priv);
dev_priv->cdclk.logical = dev_priv->cdclk.actual = dev_priv->cdclk.hw;
-
- intel_init_clock_gating(dev_priv);
}
/*
@@ -15124,6 +15123,15 @@ intel_modeset_setup_hw_state(struct drm_
struct intel_encoder *encoder;
int i;
+ if (IS_HASWELL(dev_priv)) {
+ /*
+ * WaRsPkgCStateDisplayPMReq:hsw
+ * System hang if this isn't done before disabling all planes!
+ */
+ I915_WRITE(CHICKEN_PAR1_1,
+ I915_READ(CHICKEN_PAR1_1) | FORCE_ARB_IDLE_PLANES);
+ }
+
intel_modeset_readout_hw_state(dev);
/* HW state is read out, now we need to sanitize this mess. */
@@ -15220,6 +15228,8 @@ void intel_modeset_gem_init(struct drm_d
intel_init_gt_powersave(dev_priv);
+ intel_init_clock_gating(dev_priv);
+
intel_setup_overlay(dev_priv);
}
--- a/drivers/gpu/drm/i915/intel_pm.c
+++ b/drivers/gpu/drm/i915/intel_pm.c
@@ -5669,12 +5669,30 @@ void vlv_wm_sanitize(struct drm_i915_pri
mutex_unlock(&dev_priv->wm.wm_mutex);
}
+/*
+ * FIXME should probably kill this and improve
+ * the real watermark readout/sanitation instead
+ */
+static void ilk_init_lp_watermarks(struct drm_i915_private *dev_priv)
+{
+ I915_WRITE(WM3_LP_ILK, I915_READ(WM3_LP_ILK) & ~WM1_LP_SR_EN);
+ I915_WRITE(WM2_LP_ILK, I915_READ(WM2_LP_ILK) & ~WM1_LP_SR_EN);
+ I915_WRITE(WM1_LP_ILK, I915_READ(WM1_LP_ILK) & ~WM1_LP_SR_EN);
+
+ /*
+ * Don't touch WM1S_LP_EN here.
+ * Doing so could cause underruns.
+ */
+}
+
void ilk_wm_get_hw_state(struct drm_device *dev)
{
struct drm_i915_private *dev_priv = to_i915(dev);
struct ilk_wm_values *hw = &dev_priv->wm.hw;
struct drm_crtc *crtc;
+ ilk_init_lp_watermarks(dev_priv);
+
for_each_crtc(dev, crtc)
ilk_pipe_wm_get_hw_state(crtc);
@@ -7959,18 +7977,6 @@ static void g4x_disable_trickle_feed(str
}
}
-static void ilk_init_lp_watermarks(struct drm_i915_private *dev_priv)
-{
- I915_WRITE(WM3_LP_ILK, I915_READ(WM3_LP_ILK) & ~WM1_LP_SR_EN);
- I915_WRITE(WM2_LP_ILK, I915_READ(WM2_LP_ILK) & ~WM1_LP_SR_EN);
- I915_WRITE(WM1_LP_ILK, I915_READ(WM1_LP_ILK) & ~WM1_LP_SR_EN);
-
- /*
- * Don't touch WM1S_LP_EN here.
- * Doing so could cause underruns.
- */
-}
-
static void ironlake_init_clock_gating(struct drm_i915_private *dev_priv)
{
uint32_t dspclk_gate = ILK_VRHUNIT_CLOCK_GATE_DISABLE;
@@ -8004,8 +8010,6 @@ static void ironlake_init_clock_gating(s
(I915_READ(DISP_ARB_CTL) |
DISP_FBC_WM_DIS));
- ilk_init_lp_watermarks(dev_priv);
-
/*
* Based on the document from hardware guys the following bits
* should be set unconditionally in order to enable FBC.
@@ -8118,8 +8122,6 @@ static void gen6_init_clock_gating(struc
I915_WRITE(GEN6_GT_MODE,
_MASKED_FIELD(GEN6_WIZ_HASHING_MASK, GEN6_WIZ_HASHING_16x4));
- ilk_init_lp_watermarks(dev_priv);
-
I915_WRITE(CACHE_MODE_0,
_MASKED_BIT_DISABLE(CM0_STC_EVICT_DISABLE_LRA_SNB));
@@ -8293,8 +8295,6 @@ static void broadwell_init_clock_gating(
{
enum pipe pipe;
- ilk_init_lp_watermarks(dev_priv);
-
/* WaSwitchSolVfFArbitrationPriority:bdw */
I915_WRITE(GAM_ECOCHK, I915_READ(GAM_ECOCHK) | HSW_ECOCHK_ARB_PRIO_SOL);
@@ -8349,8 +8349,6 @@ static void broadwell_init_clock_gating(
static void haswell_init_clock_gating(struct drm_i915_private *dev_priv)
{
- ilk_init_lp_watermarks(dev_priv);
-
/* L3 caching of data atomics doesn't work -- disable it. */
I915_WRITE(HSW_SCRATCH1, HSW_SCRATCH1_L3_DATA_ATOMICS_DISABLE);
I915_WRITE(HSW_ROW_CHICKEN3,
@@ -8394,10 +8392,6 @@ static void haswell_init_clock_gating(st
/* WaSwitchSolVfFArbitrationPriority:hsw */
I915_WRITE(GAM_ECOCHK, I915_READ(GAM_ECOCHK) | HSW_ECOCHK_ARB_PRIO_SOL);
- /* WaRsPkgCStateDisplayPMReq:hsw */
- I915_WRITE(CHICKEN_PAR1_1,
- I915_READ(CHICKEN_PAR1_1) | FORCE_ARB_IDLE_PLANES);
-
lpt_init_clock_gating(dev_priv);
}
@@ -8405,8 +8399,6 @@ static void ivybridge_init_clock_gating(
{
uint32_t snpcr;
- ilk_init_lp_watermarks(dev_priv);
-
I915_WRITE(ILK_DSPCLK_GATE_D, ILK_VRHUNIT_CLOCK_GATE_DISABLE);
/* WaDisableEarlyCull:ivb */
Patches currently in stable-queue which might be from ville.syrjala@xxxxxxxxxxxxxxx are
queue-4.14/drm-i915-move-init_clock_gating-back-to-where-it-was.patch
queue-4.14/drm-i915-fix-init_clock_gating-for-resume.patch