[SRU][C][PATCH v2] 4/4] drm/i915: Skip modeset for cdclk changes if possible
Hui Wang
hui.wang at canonical.com
Mon Jun 10 07:14:39 UTC 2019
From: Ville Syrjälä <ville.syrjala at linux.intel.com>
BugLink: https://launchpad.net/bugs/1826868
If we have only a single active pipe and the cdclk change only requires
the cd2x divider to be updated bxt+ can do the update with forcing a full
modeset on the pipe. Try to hook that up.
v2:
- Wait for vblank after an optimized CDCLK change.
- Avoid optimization if the pipe needs a modeset (or was disabled).
- Split CDCLK change to a pre/post plane update step.
v3:
- Use correct version of CDCLK state as old state. (Ville)
- Remove unused intel_cdclk_can_skip_modeset()
v4:
- For consistency call intel_set_cdclk_post_plane_update() only during
modesets (and not fastsets).
v5:
- Remove the logic to update the CD2X divider on-the-fly on ICL, since
only a divider of 1 is supported there. Clint also noticed that the
pipe select bits in CDCLK_CTL are oddly defined on ICL, it's not clear
yet whether that's only an error in the specification.
Signed-off-by: Ville Syrjälä <ville.syrjala at linux.intel.com>
Signed-off-by: Abhay Kumar <abhay.kumar at intel.com>
Tested-by: Abhay Kumar <abhay.kumar at intel.com>
Signed-off-by: Imre Deak <imre.deak at intel.com>
Reviewed-by: Clint Taylor <Clinton.A.Taylor at intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20190327101321.3095-1-imre.deak@intel.com
(cherry picked from commit 59f9e9cab3a1e6762fb707d0d829b982930f1349)
Signed-off-by: Hui Wang <hui.wang at canonical.com>
---
drivers/gpu/drm/i915/i915_drv.h | 3 +-
drivers/gpu/drm/i915/intel_cdclk.c | 135 +++++++++++++++++++++------
drivers/gpu/drm/i915/intel_display.c | 42 ++++++++-
drivers/gpu/drm/i915/intel_drv.h | 17 +++-
4 files changed, 163 insertions(+), 34 deletions(-)
diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index 16a99c9257fe..70a54f77dd4b 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -397,7 +397,8 @@ struct drm_i915_display_funcs {
void (*get_cdclk)(struct drm_i915_private *dev_priv,
struct intel_cdclk_state *cdclk_state);
void (*set_cdclk)(struct drm_i915_private *dev_priv,
- const struct intel_cdclk_state *cdclk_state);
+ const struct intel_cdclk_state *cdclk_state,
+ enum pipe pipe);
int (*get_fifo_size)(struct drm_i915_private *dev_priv,
enum i9xx_plane_id i9xx_plane);
int (*compute_pipe_wm)(struct intel_crtc_state *cstate);
diff --git a/drivers/gpu/drm/i915/intel_cdclk.c b/drivers/gpu/drm/i915/intel_cdclk.c
index 51564b93abd0..adcd915c4891 100644
--- a/drivers/gpu/drm/i915/intel_cdclk.c
+++ b/drivers/gpu/drm/i915/intel_cdclk.c
@@ -515,7 +515,8 @@ static void vlv_program_pfi_credits(struct drm_i915_private *dev_priv)
}
static void vlv_set_cdclk(struct drm_i915_private *dev_priv,
- const struct intel_cdclk_state *cdclk_state)
+ const struct intel_cdclk_state *cdclk_state,
+ enum pipe pipe)
{
int cdclk = cdclk_state->cdclk;
u32 val, cmd = cdclk_state->voltage_level;
@@ -596,7 +597,8 @@ static void vlv_set_cdclk(struct drm_i915_private *dev_priv,
}
static void chv_set_cdclk(struct drm_i915_private *dev_priv,
- const struct intel_cdclk_state *cdclk_state)
+ const struct intel_cdclk_state *cdclk_state,
+ enum pipe pipe)
{
int cdclk = cdclk_state->cdclk;
u32 val, cmd = cdclk_state->voltage_level;
@@ -694,7 +696,8 @@ static void bdw_get_cdclk(struct drm_i915_private *dev_priv,
}
static void bdw_set_cdclk(struct drm_i915_private *dev_priv,
- const struct intel_cdclk_state *cdclk_state)
+ const struct intel_cdclk_state *cdclk_state,
+ enum pipe pipe)
{
int cdclk = cdclk_state->cdclk;
uint32_t val;
@@ -984,7 +987,8 @@ static void skl_dpll0_disable(struct drm_i915_private *dev_priv)
}
static void skl_set_cdclk(struct drm_i915_private *dev_priv,
- const struct intel_cdclk_state *cdclk_state)
+ const struct intel_cdclk_state *cdclk_state,
+ enum pipe pipe)
{
int cdclk = cdclk_state->cdclk;
int vco = cdclk_state->vco;
@@ -1145,7 +1149,7 @@ void skl_init_cdclk(struct drm_i915_private *dev_priv)
cdclk_state.cdclk = skl_calc_cdclk(0, cdclk_state.vco);
cdclk_state.voltage_level = skl_calc_voltage_level(cdclk_state.cdclk);
- skl_set_cdclk(dev_priv, &cdclk_state);
+ skl_set_cdclk(dev_priv, &cdclk_state, INVALID_PIPE);
}
/**
@@ -1163,7 +1167,7 @@ void skl_uninit_cdclk(struct drm_i915_private *dev_priv)
cdclk_state.vco = 0;
cdclk_state.voltage_level = skl_calc_voltage_level(cdclk_state.cdclk);
- skl_set_cdclk(dev_priv, &cdclk_state);
+ skl_set_cdclk(dev_priv, &cdclk_state, INVALID_PIPE);
}
static int bxt_calc_cdclk(int min_cdclk)
@@ -1342,7 +1346,8 @@ static void bxt_de_pll_enable(struct drm_i915_private *dev_priv, int vco)
}
static void bxt_set_cdclk(struct drm_i915_private *dev_priv,
- const struct intel_cdclk_state *cdclk_state)
+ const struct intel_cdclk_state *cdclk_state,
+ enum pipe pipe)
{
int cdclk = cdclk_state->cdclk;
int vco = cdclk_state->vco;
@@ -1395,11 +1400,10 @@ static void bxt_set_cdclk(struct drm_i915_private *dev_priv,
bxt_de_pll_enable(dev_priv, vco);
val = divider | skl_cdclk_decimal(cdclk);
- /*
- * FIXME if only the cd2x divider needs changing, it could be done
- * without shutting off the pipe (if only one pipe is active).
- */
- val |= BXT_CDCLK_CD2X_PIPE_NONE;
+ if (pipe == INVALID_PIPE)
+ val |= BXT_CDCLK_CD2X_PIPE_NONE;
+ else
+ val |= BXT_CDCLK_CD2X_PIPE(pipe);
/*
* Disable SSA Precharge when CD clock frequency < 500 MHz,
* enable otherwise.
@@ -1408,6 +1412,9 @@ static void bxt_set_cdclk(struct drm_i915_private *dev_priv,
val |= BXT_CDCLK_SSA_PRECHARGE_ENABLE;
I915_WRITE(CDCLK_CTL, val);
+ if (pipe != INVALID_PIPE)
+ intel_wait_for_vblank(dev_priv, pipe);
+
mutex_lock(&dev_priv->pcu_lock);
/*
* The timeout isn't specified, the 2ms used here is based on
@@ -1512,7 +1519,7 @@ void bxt_init_cdclk(struct drm_i915_private *dev_priv)
}
cdclk_state.voltage_level = bxt_calc_voltage_level(cdclk_state.cdclk);
- bxt_set_cdclk(dev_priv, &cdclk_state);
+ bxt_set_cdclk(dev_priv, &cdclk_state, INVALID_PIPE);
}
/**
@@ -1530,7 +1537,7 @@ void bxt_uninit_cdclk(struct drm_i915_private *dev_priv)
cdclk_state.vco = 0;
cdclk_state.voltage_level = bxt_calc_voltage_level(cdclk_state.cdclk);
- bxt_set_cdclk(dev_priv, &cdclk_state);
+ bxt_set_cdclk(dev_priv, &cdclk_state, INVALID_PIPE);
}
static int cnl_calc_cdclk(int min_cdclk)
@@ -1650,7 +1657,8 @@ static void cnl_cdclk_pll_enable(struct drm_i915_private *dev_priv, int vco)
}
static void cnl_set_cdclk(struct drm_i915_private *dev_priv,
- const struct intel_cdclk_state *cdclk_state)
+ const struct intel_cdclk_state *cdclk_state,
+ enum pipe pipe)
{
int cdclk = cdclk_state->cdclk;
int vco = cdclk_state->vco;
@@ -1691,13 +1699,15 @@ static void cnl_set_cdclk(struct drm_i915_private *dev_priv,
cnl_cdclk_pll_enable(dev_priv, vco);
val = divider | skl_cdclk_decimal(cdclk);
- /*
- * FIXME if only the cd2x divider needs changing, it could be done
- * without shutting off the pipe (if only one pipe is active).
- */
- val |= BXT_CDCLK_CD2X_PIPE_NONE;
+ if (pipe == INVALID_PIPE)
+ val |= BXT_CDCLK_CD2X_PIPE_NONE;
+ else
+ val |= BXT_CDCLK_CD2X_PIPE(pipe);
I915_WRITE(CDCLK_CTL, val);
+ if (pipe != INVALID_PIPE)
+ intel_wait_for_vblank(dev_priv, pipe);
+
/* inform PCU of the change */
mutex_lock(&dev_priv->pcu_lock);
sandybridge_pcode_write(dev_priv, SKL_PCODE_CDCLK_CONTROL,
@@ -1832,7 +1842,8 @@ static int icl_calc_cdclk_pll_vco(struct drm_i915_private *dev_priv, int cdclk)
}
static void icl_set_cdclk(struct drm_i915_private *dev_priv,
- const struct intel_cdclk_state *cdclk_state)
+ const struct intel_cdclk_state *cdclk_state,
+ enum pipe pipe)
{
unsigned int cdclk = cdclk_state->cdclk;
unsigned int vco = cdclk_state->vco;
@@ -1857,6 +1868,11 @@ static void icl_set_cdclk(struct drm_i915_private *dev_priv,
if (dev_priv->cdclk.hw.vco != vco)
cnl_cdclk_pll_enable(dev_priv, vco);
+ /*
+ * On ICL CD2X_DIV can only be 1, so we'll never end up changing the
+ * divider here synchronized to a pipe while CDCLK is on, nor will we
+ * need the corresponding vblank wait.
+ */
I915_WRITE(CDCLK_CTL, ICL_CDCLK_CD2X_PIPE_NONE |
skl_cdclk_decimal(cdclk));
@@ -1951,7 +1967,7 @@ void icl_init_cdclk(struct drm_i915_private *dev_priv)
sanitized_state.vco = icl_calc_cdclk_pll_vco(dev_priv,
sanitized_state.cdclk);
- icl_set_cdclk(dev_priv, &sanitized_state);
+ icl_set_cdclk(dev_priv, &sanitized_state, INVALID_PIPE);
}
/**
@@ -1968,7 +1984,7 @@ void icl_uninit_cdclk(struct drm_i915_private *dev_priv)
cdclk_state.cdclk = cdclk_state.bypass;
cdclk_state.vco = 0;
- icl_set_cdclk(dev_priv, &cdclk_state);
+ icl_set_cdclk(dev_priv, &cdclk_state, INVALID_PIPE);
}
/**
@@ -1996,7 +2012,7 @@ void cnl_init_cdclk(struct drm_i915_private *dev_priv)
cdclk_state.vco = cnl_cdclk_pll_vco(dev_priv, cdclk_state.cdclk);
cdclk_state.voltage_level = cnl_calc_voltage_level(cdclk_state.cdclk);
- cnl_set_cdclk(dev_priv, &cdclk_state);
+ cnl_set_cdclk(dev_priv, &cdclk_state, INVALID_PIPE);
}
/**
@@ -2014,7 +2030,7 @@ void cnl_uninit_cdclk(struct drm_i915_private *dev_priv)
cdclk_state.vco = 0;
cdclk_state.voltage_level = cnl_calc_voltage_level(cdclk_state.cdclk);
- cnl_set_cdclk(dev_priv, &cdclk_state);
+ cnl_set_cdclk(dev_priv, &cdclk_state, INVALID_PIPE);
}
/**
@@ -2033,6 +2049,27 @@ bool intel_cdclk_needs_modeset(const struct intel_cdclk_state *a,
a->ref != b->ref;
}
+/**
+ * intel_cdclk_needs_cd2x_update - Determine if two CDCLK states require a cd2x divider update
+ * @a: first CDCLK state
+ * @b: second CDCLK state
+ *
+ * Returns:
+ * True if the CDCLK states require just a cd2x divider update, false if not.
+ */
+bool intel_cdclk_needs_cd2x_update(struct drm_i915_private *dev_priv,
+ const struct intel_cdclk_state *a,
+ const struct intel_cdclk_state *b)
+{
+ /* Older hw doesn't have the capability */
+ if (INTEL_GEN(dev_priv) < 10 && !IS_GEN9_LP(dev_priv))
+ return false;
+
+ return a->cdclk != b->cdclk &&
+ a->vco == b->vco &&
+ a->ref == b->ref;
+}
+
/**
* intel_cdclk_changed - Determine if two CDCLK states are different
* @a: first CDCLK state
@@ -2081,12 +2118,14 @@ void intel_dump_cdclk_state(const struct intel_cdclk_state *cdclk_state,
* intel_set_cdclk - Push the CDCLK state to the hardware
* @dev_priv: i915 device
* @cdclk_state: new CDCLK state
+ * @pipe: pipe with which to synchronize the update
*
* Program the hardware based on the passed in CDCLK state,
* if necessary.
*/
-void intel_set_cdclk(struct drm_i915_private *dev_priv,
- const struct intel_cdclk_state *cdclk_state)
+static void intel_set_cdclk(struct drm_i915_private *dev_priv,
+ const struct intel_cdclk_state *cdclk_state,
+ enum pipe pipe)
{
if (!intel_cdclk_changed(&dev_priv->cdclk.hw, cdclk_state))
return;
@@ -2096,7 +2135,7 @@ void intel_set_cdclk(struct drm_i915_private *dev_priv,
intel_dump_cdclk_state(cdclk_state, "Changing CDCLK to");
- dev_priv->display.set_cdclk(dev_priv, cdclk_state);
+ dev_priv->display.set_cdclk(dev_priv, cdclk_state, pipe);
if (WARN(intel_cdclk_changed(&dev_priv->cdclk.hw, cdclk_state),
"cdclk state doesn't match!\n")) {
@@ -2105,6 +2144,46 @@ void intel_set_cdclk(struct drm_i915_private *dev_priv,
}
}
+/**
+ * intel_set_cdclk_pre_plane_update - Push the CDCLK state to the hardware
+ * @dev_priv: i915 device
+ * @old_state: old CDCLK state
+ * @new_state: new CDCLK state
+ * @pipe: pipe with which to synchronize the update
+ *
+ * Program the hardware before updating the HW plane state based on the passed
+ * in CDCLK state, if necessary.
+ */
+void
+intel_set_cdclk_pre_plane_update(struct drm_i915_private *dev_priv,
+ const struct intel_cdclk_state *old_state,
+ const struct intel_cdclk_state *new_state,
+ enum pipe pipe)
+{
+ if (pipe == INVALID_PIPE || old_state->cdclk <= new_state->cdclk)
+ intel_set_cdclk(dev_priv, new_state, pipe);
+}
+
+/**
+ * intel_set_cdclk_post_plane_update - Push the CDCLK state to the hardware
+ * @dev_priv: i915 device
+ * @old_state: old CDCLK state
+ * @new_state: new CDCLK state
+ * @pipe: pipe with which to synchronize the update
+ *
+ * Program the hardware after updating the HW plane state based on the passed
+ * in CDCLK state, if necessary.
+ */
+void
+intel_set_cdclk_post_plane_update(struct drm_i915_private *dev_priv,
+ const struct intel_cdclk_state *old_state,
+ const struct intel_cdclk_state *new_state,
+ enum pipe pipe)
+{
+ if (pipe != INVALID_PIPE && old_state->cdclk > new_state->cdclk)
+ intel_set_cdclk(dev_priv, new_state, pipe);
+}
+
static int intel_pixel_rate_to_cdclk(struct drm_i915_private *dev_priv,
int pixel_rate)
{
diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index be898e7b3285..45b9c56b8131 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -12115,6 +12115,7 @@ static int intel_modeset_checks(struct drm_atomic_state *state)
intel_state->active_crtcs = dev_priv->active_crtcs;
intel_state->cdclk.logical = dev_priv->cdclk.logical;
intel_state->cdclk.actual = dev_priv->cdclk.actual;
+ intel_state->cdclk.pipe = INVALID_PIPE;
for_each_oldnew_crtc_in_state(state, crtc, old_crtc_state, new_crtc_state, i) {
if (new_crtc_state->active)
@@ -12134,6 +12135,8 @@ static int intel_modeset_checks(struct drm_atomic_state *state)
* adjusted_mode bits in the crtc directly.
*/
if (dev_priv->display.modeset_calc_cdclk) {
+ enum pipe pipe;
+
ret = dev_priv->display.modeset_calc_cdclk(state);
if (ret < 0)
return ret;
@@ -12150,12 +12153,36 @@ static int intel_modeset_checks(struct drm_atomic_state *state)
return ret;
}
+ if (is_power_of_2(intel_state->active_crtcs)) {
+ struct drm_crtc *crtc;
+ struct drm_crtc_state *crtc_state;
+
+ pipe = ilog2(intel_state->active_crtcs);
+ crtc = &intel_get_crtc_for_pipe(dev_priv, pipe)->base;
+ crtc_state = drm_atomic_get_new_crtc_state(state, crtc);
+ if (crtc_state && needs_modeset(crtc_state))
+ pipe = INVALID_PIPE;
+ } else {
+ pipe = INVALID_PIPE;
+ }
+
/* All pipes must be switched off while we change the cdclk. */
- if (intel_cdclk_needs_modeset(&dev_priv->cdclk.actual,
- &intel_state->cdclk.actual)) {
+ if (pipe != INVALID_PIPE &&
+ intel_cdclk_needs_cd2x_update(dev_priv,
+ &dev_priv->cdclk.actual,
+ &intel_state->cdclk.actual)) {
+ ret = intel_lock_all_pipes(state);
+ if (ret < 0)
+ return ret;
+
+ intel_state->cdclk.pipe = pipe;
+ } else if (intel_cdclk_needs_modeset(&dev_priv->cdclk.actual,
+ &intel_state->cdclk.actual)) {
ret = intel_modeset_all_pipes(state);
if (ret < 0)
return ret;
+
+ intel_state->cdclk.pipe = INVALID_PIPE;
}
DRM_DEBUG_KMS("New cdclk calculated to be logical %u kHz, actual %u kHz\n",
@@ -12528,7 +12555,10 @@ static void intel_atomic_commit_tail(struct drm_atomic_state *state)
if (intel_state->modeset) {
drm_atomic_helper_update_legacy_modeset_state(state->dev, state);
- intel_set_cdclk(dev_priv, &dev_priv->cdclk.actual);
+ intel_set_cdclk_pre_plane_update(dev_priv,
+ &intel_state->cdclk.actual,
+ &dev_priv->cdclk.actual,
+ intel_state->cdclk.pipe);
/*
* SKL workaround: bspec recommends we disable the SAGV when we
@@ -12557,6 +12587,12 @@ static void intel_atomic_commit_tail(struct drm_atomic_state *state)
/* Now enable the clocks, plane, pipe, and connectors that we set up. */
dev_priv->display.update_crtcs(state);
+ if (intel_state->modeset)
+ intel_set_cdclk_post_plane_update(dev_priv,
+ &intel_state->cdclk.actual,
+ &dev_priv->cdclk.actual,
+ intel_state->cdclk.pipe);
+
/* FIXME: We should call drm_atomic_helper_commit_hw_done() here
* already, but still need the state for the delayed optimization. To
* fix this:
diff --git a/drivers/gpu/drm/i915/intel_drv.h b/drivers/gpu/drm/i915/intel_drv.h
index 718ed61fa81d..030b0ffe8fdf 100644
--- a/drivers/gpu/drm/i915/intel_drv.h
+++ b/drivers/gpu/drm/i915/intel_drv.h
@@ -463,6 +463,8 @@ struct intel_atomic_state {
int force_min_cdclk;
bool force_min_cdclk_changed;
+ /* pipe to which cd2x update is synchronized */
+ enum pipe pipe;
} cdclk;
bool dpll_set, modeset;
@@ -1448,13 +1450,24 @@ void intel_init_cdclk_hooks(struct drm_i915_private *dev_priv);
void intel_update_max_cdclk(struct drm_i915_private *dev_priv);
void intel_update_cdclk(struct drm_i915_private *dev_priv);
void intel_update_rawclk(struct drm_i915_private *dev_priv);
+bool intel_cdclk_needs_cd2x_update(struct drm_i915_private *dev_priv,
+ const struct intel_cdclk_state *a,
+ const struct intel_cdclk_state *b);
bool intel_cdclk_needs_modeset(const struct intel_cdclk_state *a,
const struct intel_cdclk_state *b);
bool intel_cdclk_changed(const struct intel_cdclk_state *a,
const struct intel_cdclk_state *b);
void intel_cdclk_swap_state(struct intel_atomic_state *state);
-void intel_set_cdclk(struct drm_i915_private *dev_priv,
- const struct intel_cdclk_state *cdclk_state);
+void
+intel_set_cdclk_pre_plane_update(struct drm_i915_private *dev_priv,
+ const struct intel_cdclk_state *old_state,
+ const struct intel_cdclk_state *new_state,
+ enum pipe pipe);
+void
+intel_set_cdclk_post_plane_update(struct drm_i915_private *dev_priv,
+ const struct intel_cdclk_state *old_state,
+ const struct intel_cdclk_state *new_state,
+ enum pipe pipe);
void intel_dump_cdclk_state(const struct intel_cdclk_state *cdclk_state,
const char *context);
--
2.17.1
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