On Fri, Aug 19, 2022 at 05:58:20PM -0700, Anusha Srivatsa wrote:
> Apart from checking if squashing can be performed,
> accommodate accessing in-flight cdclk state for any changes
> that are needed during commit phase.
>
> v2: Move squashing bits to switch case.(Anusha)
>
> Cc: Jani Nikula <jani.nikula@xxxxxxxxx>
> Signed-off-by: Anusha Srivatsa <anusha.srivatsa@xxxxxxxxx>
> ---
> drivers/gpu/drm/i915/display/intel_cdclk.c | 62 ++++++++++++++--------
> 1 file changed, 40 insertions(+), 22 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/display/intel_cdclk.c b/drivers/gpu/drm/i915/display/intel_cdclk.c
> index 86a22c3766e5..f98fd48fe905 100644
> --- a/drivers/gpu/drm/i915/display/intel_cdclk.c
> +++ b/drivers/gpu/drm/i915/display/intel_cdclk.c
> @@ -1693,12 +1693,18 @@ static void bxt_set_cdclk(struct drm_i915_private *dev_priv,
> const struct intel_cdclk_config *cdclk_config,
> enum pipe pipe)
> {
> + struct intel_cdclk_state *cdclk_state = to_intel_cdclk_state(dev_priv->cdclk.obj.state);
> + struct intel_atomic_state *state = cdclk_state->base.state;
> + struct intel_cdclk_state *new_cdclk_state = intel_atomic_get_new_cdclk_state(state);
This will not work, make cdclk steps as part of cdlck_config struct and
access that through the passed cdclk_config
This already gets passed from the calling function intel_set_cdclk()
which is getting called from intel_set_cdclk_post_plane_update() from
commit_tail()
This is the correct way of programming req HW registers from cdclk state
Manasi
> + struct cdclk_step *cdclk_steps = new_cdclk_state->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)
> @@ -1742,21 +1748,27 @@ static void bxt_set_cdclk(struct drm_i915_private *dev_priv,
>
> waveform = cdclk_squash_waveform(dev_priv, cdclk);
>
> - if (waveform)
> + if (waveform && has_cdclk_squasher(dev_priv)) {
> clock = vco / 2;
> - else
> + for (i = 0; i < MAX_CDCLK_ACTIONS; i++) {
> + switch (cdclk_steps[i].action) {
> + case INTEL_CDCLK_SQUASH:
> + waveform = cdclk_squash_waveform(dev_priv, cdclk_steps[i].cdclk);
> + squash_ctl = CDCLK_SQUASH_ENABLE |
> + CDCLK_SQUASH_WINDOW_SIZE(0xf) | waveform;
> + intel_de_write(dev_priv, CDCLK_SQUASH_CTL, squash_ctl);
> + break;
> + case INTEL_CDCLK_NOOP:
> + case INTEL_CDCLK_CRAWL:
> + case INTEL_CDCLK_MODESET:
> + break;
> + default:
> + break;
> + }
> + }
> + } else
> clock = cdclk;
>
> - if (has_cdclk_squasher(dev_priv)) {
> - u32 squash_ctl = 0;
> -
> - if (waveform)
> - squash_ctl = CDCLK_SQUASH_ENABLE |
> - CDCLK_SQUASH_WINDOW_SIZE(0xf) | waveform;
> -
> - intel_de_write(dev_priv, CDCLK_SQUASH_CTL, squash_ctl);
> - }
> -
> val = bxt_cdclk_cd2x_div_sel(dev_priv, clock, vco) |
> bxt_cdclk_cd2x_pipe(dev_priv, pipe) |
> skl_cdclk_decimal(cdclk);
> @@ -1966,10 +1978,11 @@ static bool intel_cdclk_can_crawl(struct drm_i915_private *dev_priv,
> a->ref == b->ref;
> }
>
> -static bool intel_cdclk_can_squash(struct drm_i915_private *dev_priv,
> - const struct intel_cdclk_config *a,
> - const struct intel_cdclk_config *b)
> +static bool intel_cdclk_squash(struct drm_i915_private *dev_priv,
> + const struct intel_cdclk_state *a,
> + struct intel_cdclk_state *b)
> {
> + struct cdclk_step *cdclk_transition = b->steps;
> /*
> * FIXME should store a bit more state in intel_cdclk_config
> * to differentiate squasher vs. cd2x divider properly. For
> @@ -1978,11 +1991,16 @@ static bool intel_cdclk_can_squash(struct drm_i915_private *dev_priv,
> */
> if (!has_cdclk_squasher(dev_priv))
> return false;
> +
> + cdclk_transition[0].action = INTEL_CDCLK_SQUASH;
> + cdclk_transition[0].cdclk = b->actual.cdclk;
> + cdclk_transition[1].action = INTEL_CDCLK_NOOP;
> + cdclk_transition[1].cdclk = b->actual.cdclk;
>
> - return a->cdclk != b->cdclk &&
> - a->vco != 0 &&
> - a->vco == b->vco &&
> - a->ref == b->ref;
> + return a->actual.cdclk != b->actual.cdclk &&
> + a->actual.vco != 0 &&
> + a->actual.vco == b->actual.vco &&
> + a->actual.ref == b->actual.ref;
> }
>
> /**
> @@ -2758,9 +2776,9 @@ 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,
> + new_cdclk_state)) {
> drm_dbg_kms(&dev_priv->drm,
> "Can change cdclk via squasher\n");
> } else if (intel_cdclk_can_crawl(dev_priv,
> --
> 2.25.1
>
