On Fri, 17 Dec 2021, Anusha Srivatsa <anusha.sriva...@intel.com> wrote:
> Checking cdclk conditions during atomic check and preparing
> for commit phase so we can have atomic commit as simple
> as possible. Add the specific steps to be taken during
> cdclk changes, prepare for squashing, crawling and modeset
> scenarios.
> Rename functions intel_cdclk_can_squash() and
> intel_cdclk_can_crawl() since they no longer simply check
> if squashing and crawling can be performed.
>
> Cc: Matt Roper <matthew.d.ro...@intel.com>
> Signed-off-by: Anusha Srivatsa <anusha.sriva...@intel.com>
> ---
> drivers/gpu/drm/i915/display/intel_cdclk.c | 130 +++++++++++-------
> drivers/gpu/drm/i915/display/intel_cdclk.h | 3 +-
> .../drm/i915/display/intel_display_power.c | 2 +-
> drivers/gpu/drm/i915/i915_drv.h | 13 ++
> 4 files changed, 96 insertions(+), 52 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/display/intel_cdclk.c
> b/drivers/gpu/drm/i915/display/intel_cdclk.c
> index 249f81a80eb7..4a5ddc202c05 100644
> --- a/drivers/gpu/drm/i915/display/intel_cdclk.c
> +++ b/drivers/gpu/drm/i915/display/intel_cdclk.c
> @@ -1698,12 +1698,15 @@ static void bxt_set_cdclk(struct drm_i915_private
> *dev_priv,
> const struct intel_cdclk_config *cdclk_config,
> enum pipe pipe)
> {
> + struct cdclk_steps *cdclk_steps = dev_priv->cdclk.steps;
> int cdclk = cdclk_config->cdclk;
> int vco = cdclk_config->vco;
> + u32 squash_ctl = 0;
> u32 val;
> u16 waveform;
> int clock;
> int ret;
> + int i;
>
> /* Inform power controller of upcoming frequency change. */
> if (DISPLAY_VER(dev_priv) >= 11)
> @@ -1727,40 +1730,43 @@ static void bxt_set_cdclk(struct drm_i915_private
> *dev_priv,
> return;
> }
>
> - if (HAS_CDCLK_CRAWL(dev_priv) && dev_priv->cdclk.hw.vco > 0 && vco > 0)
> {
> - if (dev_priv->cdclk.hw.vco != vco)
> + for (i = 0; i < CDCLK_ACTIONS; i++) {
> + switch (cdclk_steps[i].action) {
> + case CDCLK_MODESET:
> + if (DISPLAY_VER(dev_priv) >= 11) {
> + if (dev_priv->cdclk.hw.vco != 0 &&
> + dev_priv->cdclk.hw.vco != vco)
> + icl_cdclk_pll_disable(dev_priv);
> +
> + if (dev_priv->cdclk.hw.vco != vco)
> + icl_cdclk_pll_enable(dev_priv, vco);
> + } else {
> + if (dev_priv->cdclk.hw.vco != 0 &&
> + dev_priv->cdclk.hw.vco != vco)
> + bxt_de_pll_disable(dev_priv);
> +
> + if (dev_priv->cdclk.hw.vco != vco)
> + bxt_de_pll_enable(dev_priv, vco);
> + }
> + clock = cdclk;
> + break;
> + case CDCLK_CRAWL:
> adlp_cdclk_pll_crawl(dev_priv, vco);
> - } else if (DISPLAY_VER(dev_priv) >= 11) {
> - if (dev_priv->cdclk.hw.vco != 0 &&
> - dev_priv->cdclk.hw.vco != vco)
> - icl_cdclk_pll_disable(dev_priv);
> -
> - if (dev_priv->cdclk.hw.vco != vco)
> - icl_cdclk_pll_enable(dev_priv, vco);
> - } else {
> - if (dev_priv->cdclk.hw.vco != 0 &&
> - dev_priv->cdclk.hw.vco != vco)
> - bxt_de_pll_disable(dev_priv);
> -
> - if (dev_priv->cdclk.hw.vco != vco)
> - bxt_de_pll_enable(dev_priv, vco);
> - }
> -
> - waveform = cdclk_squash_waveform(dev_priv, cdclk);
> -
> - if (waveform)
> - clock = vco / 2;
> - else
> - clock = cdclk;
> -
> - if (has_cdclk_squasher(dev_priv)) {
> - u32 squash_ctl = 0;
> -
> - if (waveform)
> + clock = cdclk;
> + break;
> + case CDCLK_SQUASH:
> + waveform = cdclk_squash_waveform(dev_priv,
> cdclk_steps[i].cdclk);
> + clock = vco / 2;
> squash_ctl = CDCLK_SQUASH_ENABLE |
> - CDCLK_SQUASH_WINDOW_SIZE(0xf) | waveform;
> -
> - intel_de_write(dev_priv, CDCLK_SQUASH_CTL, squash_ctl);
> + CDCLK_SQUASH_WINDOW_SIZE(0xf) |
> waveform;
> + intel_de_write(dev_priv, CDCLK_SQUASH_CTL, squash_ctl);
> + break;
> + case CDCLK_NOOP:
> + break;
> + default:
> + MISSING_CASE(cdclk_steps[i].action);
> + break;
> + }
> }
>
> val = bxt_cdclk_cd2x_div_sel(dev_priv, clock, vco) |
> @@ -1950,10 +1956,11 @@ void intel_cdclk_uninit_hw(struct drm_i915_private
> *i915)
> skl_cdclk_uninit_hw(i915);
> }
>
> -static bool intel_cdclk_can_crawl(struct drm_i915_private *dev_priv,
> +static bool intel_cdclk_crawl(struct drm_i915_private *dev_priv,
> const struct intel_cdclk_config *a,
> const struct intel_cdclk_config *b)
> {
> + struct cdclk_steps *cdclk_transition = dev_priv->cdclk.steps;
> int a_div, b_div;
>
> if (!HAS_CDCLK_CRAWL(dev_priv))
> @@ -1966,16 +1973,22 @@ static bool intel_cdclk_can_crawl(struct
> drm_i915_private *dev_priv,
> a_div = DIV_ROUND_CLOSEST(a->vco, a->cdclk);
> b_div = DIV_ROUND_CLOSEST(b->vco, b->cdclk);
>
> + cdclk_transition[0].action = CDCLK_CRAWL;
> + cdclk_transition[0].cdclk = b->cdclk;
> + cdclk_transition[1].action = CDCLK_NOOP;
> + cdclk_transition[1].cdclk = b->cdclk;
> +
> return a->vco != 0 && b->vco != 0 &&
> a->vco != b->vco &&
> a_div == b_div &&
> a->ref == b->ref;
> }
>
> -static bool intel_cdclk_can_squash(struct drm_i915_private *dev_priv,
> +static bool intel_cdclk_squash(struct drm_i915_private *dev_priv,
> const struct intel_cdclk_config *a,
> const struct intel_cdclk_config *b)
> {
> + struct cdclk_steps *cdclk_transition = dev_priv->cdclk.steps;
> /*
> * FIXME should store a bit more state in intel_cdclk_config
> * to differentiate squasher vs. cd2x divider properly. For
> @@ -1985,6 +1998,11 @@ static bool intel_cdclk_can_squash(struct
> drm_i915_private *dev_priv,
> if (!has_cdclk_squasher(dev_priv))
> return false;
>
> + cdclk_transition[0].action = CDCLK_SQUASH;
> + cdclk_transition[0].cdclk = b->cdclk;
> + cdclk_transition[1].action = CDCLK_NOOP;
> + cdclk_transition[1].cdclk = b->cdclk;
> +
> return a->cdclk != b->cdclk &&
> a->vco != 0 &&
> a->vco == b->vco &&
> @@ -2001,9 +2019,19 @@ static bool intel_cdclk_can_squash(struct
> drm_i915_private *dev_priv,
> * True if changing between the two CDCLK configurations
> * requires all pipes to be off, false if not.
> */
> -bool intel_cdclk_needs_modeset(const struct intel_cdclk_config *a,
> +bool intel_cdclk_needs_modeset(struct drm_i915_private *dev_priv,
> + const struct intel_cdclk_config *a,
> const struct intel_cdclk_config *b)
> {
> + struct cdclk_steps *cdclk_transition = dev_priv->cdclk.steps;
> +
> + if (a->cdclk != b->cdclk || a->vco != b->vco || a->ref != b->ref) {
> + cdclk_transition[0].action = CDCLK_MODESET;
> + cdclk_transition[0].cdclk = b->cdclk;
> + cdclk_transition[1].action = CDCLK_NOOP;
> + cdclk_transition[1].cdclk = b->cdclk;
> + }
> +
> return a->cdclk != b->cdclk ||
> a->vco != b->vco ||
> a->ref != b->ref;
> @@ -2051,10 +2079,11 @@ static bool intel_cdclk_can_cd2x_update(struct
> drm_i915_private *dev_priv,
> * Returns:
> * True if the CDCLK configurations don't match, false if they do.
> */
> -static bool intel_cdclk_changed(const struct intel_cdclk_config *a,
> +static bool intel_cdclk_changed(struct drm_i915_private *dev_priv,
> + const struct intel_cdclk_config *a,
> const struct intel_cdclk_config *b)
> {
> - return intel_cdclk_needs_modeset(a, b) ||
> + return intel_cdclk_needs_modeset(dev_priv, a, b) ||
> a->voltage_level != b->voltage_level;
> }
>
> @@ -2082,7 +2111,7 @@ static void intel_set_cdclk(struct drm_i915_private
> *dev_priv,
> {
> struct intel_encoder *encoder;
>
> - if (!intel_cdclk_changed(&dev_priv->cdclk.hw, cdclk_config))
> + if (!intel_cdclk_changed(dev_priv, &dev_priv->cdclk.hw, cdclk_config))
> return;
>
> if (drm_WARN_ON_ONCE(&dev_priv->drm, !dev_priv->cdclk_funcs->set_cdclk))
> @@ -2129,7 +2158,7 @@ static void intel_set_cdclk(struct drm_i915_private
> *dev_priv,
> intel_audio_cdclk_change_post(dev_priv);
>
> if (drm_WARN(&dev_priv->drm,
> - intel_cdclk_changed(&dev_priv->cdclk.hw, cdclk_config),
> + intel_cdclk_changed(dev_priv, &dev_priv->cdclk.hw,
> cdclk_config),
> "cdclk state doesn't match!\n")) {
> intel_dump_cdclk_config(&dev_priv->cdclk.hw, "[hw state]");
> intel_dump_cdclk_config(cdclk_config, "[sw state]");
> @@ -2153,7 +2182,7 @@ intel_set_cdclk_pre_plane_update(struct
> intel_atomic_state *state)
> intel_atomic_get_new_cdclk_state(state);
> enum pipe pipe = new_cdclk_state->pipe;
>
> - if (!intel_cdclk_changed(&old_cdclk_state->actual,
> + if (!intel_cdclk_changed(dev_priv, &old_cdclk_state->actual,
> &new_cdclk_state->actual))
> return;
>
> @@ -2182,7 +2211,7 @@ intel_set_cdclk_post_plane_update(struct
> intel_atomic_state *state)
> intel_atomic_get_new_cdclk_state(state);
> enum pipe pipe = new_cdclk_state->pipe;
>
> - if (!intel_cdclk_changed(&old_cdclk_state->actual,
> + if (!intel_cdclk_changed(dev_priv, &old_cdclk_state->actual,
> &new_cdclk_state->actual))
> return;
>
> @@ -2736,7 +2765,7 @@ int intel_modeset_calc_cdclk(struct intel_atomic_state
> *state)
> if (ret)
> return ret;
>
> - if (intel_cdclk_changed(&old_cdclk_state->actual,
> + if (intel_cdclk_changed(dev_priv, &old_cdclk_state->actual,
> &new_cdclk_state->actual)) {
> /*
> * Also serialize commits across all crtcs
> @@ -2747,7 +2776,7 @@ int intel_modeset_calc_cdclk(struct intel_atomic_state
> *state)
> return ret;
> } else if (old_cdclk_state->active_pipes !=
> new_cdclk_state->active_pipes ||
> old_cdclk_state->force_min_cdclk !=
> new_cdclk_state->force_min_cdclk ||
> - intel_cdclk_changed(&old_cdclk_state->logical,
> + intel_cdclk_changed(dev_priv, &old_cdclk_state->logical,
> &new_cdclk_state->logical)) {
> ret = intel_atomic_lock_global_state(&new_cdclk_state->base);
> if (ret)
> @@ -2774,14 +2803,14 @@ int intel_modeset_calc_cdclk(struct
> intel_atomic_state *state)
> pipe = INVALID_PIPE;
> }
>
> - if (intel_cdclk_can_squash(dev_priv,
> - &old_cdclk_state->actual,
> - &new_cdclk_state->actual)) {
> + if (intel_cdclk_squash(dev_priv,
> + &old_cdclk_state->actual,
> + &new_cdclk_state->actual)) {
> drm_dbg_kms(&dev_priv->drm,
> "Can change cdclk via squasher\n");
> - } else if (intel_cdclk_can_crawl(dev_priv,
> - &old_cdclk_state->actual,
> - &new_cdclk_state->actual)) {
> + } else if (intel_cdclk_crawl(dev_priv,
> + &old_cdclk_state->actual,
> + &new_cdclk_state->actual)) {
> drm_dbg_kms(&dev_priv->drm,
> "Can change cdclk via crawl\n");
> } else if (pipe != INVALID_PIPE) {
> @@ -2790,7 +2819,8 @@ int intel_modeset_calc_cdclk(struct intel_atomic_state
> *state)
> drm_dbg_kms(&dev_priv->drm,
> "Can change cdclk cd2x divider with pipe %c
> active\n",
> pipe_name(pipe));
> - } else if (intel_cdclk_needs_modeset(&old_cdclk_state->actual,
> + } else if (intel_cdclk_needs_modeset(dev_priv,
> + &old_cdclk_state->actual,
> &new_cdclk_state->actual)) {
> /* All pipes must be switched off while we change the cdclk. */
> ret = intel_modeset_all_pipes(state);
> diff --git a/drivers/gpu/drm/i915/display/intel_cdclk.h
> b/drivers/gpu/drm/i915/display/intel_cdclk.h
> index 71dd84740ae3..cc52ef029bb4 100644
> --- a/drivers/gpu/drm/i915/display/intel_cdclk.h
> +++ b/drivers/gpu/drm/i915/display/intel_cdclk.h
> @@ -58,7 +58,8 @@ 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);
> u32 intel_read_rawclk(struct drm_i915_private *dev_priv);
> -bool intel_cdclk_needs_modeset(const struct intel_cdclk_config *a,
> +bool intel_cdclk_needs_modeset(struct drm_i915_private *dev_priv,
> + const struct intel_cdclk_config *a,
> const struct intel_cdclk_config *b);
> void intel_set_cdclk_pre_plane_update(struct intel_atomic_state *state);
> void intel_set_cdclk_post_plane_update(struct intel_atomic_state *state);
> diff --git a/drivers/gpu/drm/i915/display/intel_display_power.c
> b/drivers/gpu/drm/i915/display/intel_display_power.c
> index 05babdcf5f2e..5c6671296019 100644
> --- a/drivers/gpu/drm/i915/display/intel_display_power.c
> +++ b/drivers/gpu/drm/i915/display/intel_display_power.c
> @@ -1297,7 +1297,7 @@ static void gen9_disable_dc_states(struct
> drm_i915_private *dev_priv)
> intel_cdclk_get_cdclk(dev_priv, &cdclk_config);
> /* Can't read out voltage_level so can't use intel_cdclk_changed() */
> drm_WARN_ON(&dev_priv->drm,
> - intel_cdclk_needs_modeset(&dev_priv->cdclk.hw,
> + intel_cdclk_needs_modeset(dev_priv, &dev_priv->cdclk.hw,
> &cdclk_config));
>
> gen9_assert_dbuf_enabled(dev_priv);
> diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
> index ed48179bacd8..2d2f97138fe2 100644
> --- a/drivers/gpu/drm/i915/i915_drv.h
> +++ b/drivers/gpu/drm/i915/i915_drv.h
> @@ -119,6 +119,14 @@
>
> struct drm_i915_gem_object;
>
> +enum cdclk_actions {
> + CDCLK_MODESET = 0,
> + CDCLK_SQUASH,
> + CDCLK_CRAWL,
> + CDCLK_NOOP,
> + CDCLK_ACTIONS
> +};
> +
> /* Threshold == 5 for long IRQs, 50 for short */
> #define HPD_STORM_DEFAULT_THRESHOLD 50
>
> @@ -769,6 +777,11 @@ struct drm_i915_private {
> const struct intel_cdclk_vals *table;
>
> struct intel_global_obj obj;
> +
> + struct cdclk_steps {
> + enum cdclk_actions action;
> + u32 cdclk;
> + } steps[CDCLK_ACTIONS];
Is this modeset state recorded directly in struct drm_i915_private
instead of actual modeset state objects?
BR,
Jani.
> } cdclk;
>
> struct {
--
Jani Nikula, Intel Open Source Graphics Center
