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drm/i915: Move init_clock_gating() back to where it was

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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 b7048ea12f ("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: stable@vger.kernel.org
Cc: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Mark Janes <mark.a.janes@intel.com>
Cc: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Cc: Daniel Vetter <daniel.vetter@ffwll.ch>
Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Cc: Oscar Mateo <oscar.mateo@intel.com>
Cc: Mika Kuoppala <mika.kuoppala@linux.intel.com>
Reported-by: Mark Janes <mark.a.janes@intel.com>
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=103549
Fixes: b7048ea12f ("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@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20171108133555.14091-1-ville.syrjala@linux.intel.com
Tested-by: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
(cherry picked from commit f72b84c677)
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
This commit is contained in:
Ville Syrjälä
2017-11-08 15:35:55 +02:00
zatwierdzone przez Jani Nikula
rodzic 398c13b963
commit 6ac4327276
2 zmienionych plików z 30 dodań i 28 usunięć
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44
drivers/gpu/drm/i915/intel_pm.c
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@@ -5762,12 +5762,30 @@ void vlv_wm_sanitize(struct drm_i915_private *dev_priv)
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);
@@ -8214,18 +8232,6 @@ static void g4x_disable_trickle_feed(struct drm_i915_private *dev_priv)
}
}
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 ilk_init_clock_gating(struct drm_i915_private *dev_priv)
{
uint32_t dspclk_gate = ILK_VRHUNIT_CLOCK_GATE_DISABLE;
@@ -8259,8 +8265,6 @@ static void ilk_init_clock_gating(struct drm_i915_private *dev_priv)
(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.
@@ -8373,8 +8377,6 @@ static void gen6_init_clock_gating(struct drm_i915_private *dev_priv)
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));
@@ -8601,8 +8603,6 @@ static void bdw_init_clock_gating(struct drm_i915_private *dev_priv)
I915_GTT_PAGE_SIZE_2M);
enum pipe pipe;
ilk_init_lp_watermarks(dev_priv);
/* WaSwitchSolVfFArbitrationPriority:bdw */
I915_WRITE(GAM_ECOCHK, I915_READ(GAM_ECOCHK) | HSW_ECOCHK_ARB_PRIO_SOL);
@@ -8653,8 +8653,6 @@ static void bdw_init_clock_gating(struct drm_i915_private *dev_priv)
static void hsw_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,
@@ -8698,10 +8696,6 @@ static void hsw_init_clock_gating(struct drm_i915_private *dev_priv)
/* 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);
}
@@ -8709,8 +8703,6 @@ static void ivb_init_clock_gating(struct drm_i915_private *dev_priv)
{
uint32_t snpcr;
ilk_init_lp_watermarks(dev_priv);
I915_WRITE(ILK_DSPCLK_GATE_D, ILK_VRHUNIT_CLOCK_GATE_DISABLE);
/* WaDisableEarlyCull:ivb */