Commit 59f9e9ca authored by Ville Syrjälä's avatar Ville Syrjälä Committed by Imre Deak

drm/i915: Skip modeset for cdclk changes if possible

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: default avatarVille Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: default avatarAbhay Kumar <abhay.kumar@intel.com>
Tested-by: default avatarAbhay Kumar <abhay.kumar@intel.com>
Signed-off-by: default avatarImre Deak <imre.deak@intel.com>
Reviewed-by: default avatarClint Taylor <Clinton.A.Taylor@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20190327101321.3095-1-imre.deak@intel.com
parent 2b21dfbe
......@@ -282,7 +282,8 @@ 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);
......
......@@ -517,7 +517,8 @@ 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;
......@@ -599,7 +600,8 @@ 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;
......@@ -698,7 +700,8 @@ 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;
u32 val;
......@@ -988,7 +991,8 @@ 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;
......@@ -1159,7 +1163,7 @@ 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);
}
/**
......@@ -1177,7 +1181,7 @@ 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)
......@@ -1356,7 +1360,8 @@ 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;
......@@ -1409,11 +1414,10 @@ 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).
*/
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.
......@@ -1422,6 +1426,9 @@ 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
......@@ -1526,7 +1533,7 @@ 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);
}
/**
......@@ -1544,7 +1551,7 @@ 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)
......@@ -1664,7 +1671,8 @@ 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;
......@@ -1705,13 +1713,15 @@ 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).
*/
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,
......@@ -1848,7 +1858,8 @@ 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;
......@@ -1873,6 +1884,11 @@ 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));
......@@ -2003,7 +2019,7 @@ void icl_init_cdclk(struct drm_i915_private *dev_priv)
sanitized_state.voltage_level =
icl_calc_voltage_level(sanitized_state.cdclk);
icl_set_cdclk(dev_priv, &sanitized_state);
icl_set_cdclk(dev_priv, &sanitized_state, INVALID_PIPE);
}
/**
......@@ -2021,7 +2037,7 @@ void icl_uninit_cdclk(struct drm_i915_private *dev_priv)
cdclk_state.vco = 0;
cdclk_state.voltage_level = icl_calc_voltage_level(cdclk_state.cdclk);
icl_set_cdclk(dev_priv, &cdclk_state);
icl_set_cdclk(dev_priv, &cdclk_state, INVALID_PIPE);
}
/**
......@@ -2049,7 +2065,7 @@ 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);
}
/**
......@@ -2067,7 +2083,7 @@ 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);
}
/**
......@@ -2086,6 +2102,27 @@ 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
......@@ -2134,12 +2171,14 @@ 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;
......@@ -2149,7 +2188,7 @@ 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")) {
......@@ -2158,6 +2197,46 @@ 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)
{
......
......@@ -13002,6 +13002,7 @@ 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)
......@@ -13021,6 +13022,8 @@ 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;
......@@ -13037,12 +13040,36 @@ 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,
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",
......@@ -13451,7 +13478,10 @@ 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
......@@ -13480,6 +13510,12 @@ 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:
......
......@@ -559,6 +559,8 @@ 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;
......@@ -1694,13 +1696,24 @@ 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);
......
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