On Wed, 08 Feb 2023, Stanislav Lisovskiy <stanislav.lisovskiy@xxxxxxxxx> wrote:
> From: Jigar Bhatt <jigar.bhatt@xxxxxxxxx>
>
> Display to communicate "display configuration" to Pcode for more accurate
> power accounting for DG2. Existing sequence is only sending the voltage
> value to the Pcode. Adding new sequence with current cdclk associate
> with voltage value masking. Adding pcode request when any power well
> will disable or enable.
>
> v2: - Fixed identation(Stanislav Lisovskiy)
> - Made conditions more specific(in the commit we declare that
> we do this for DG2 only, however that commit changes >= to
> == for many other platforms.(Stanislav Lisovskiy)
>
> Signed-off-by: Jigar Bhatt <jigar.bhatt@xxxxxxxxx>
> Signed-off-by: Stanislav Lisovskiy <stanislav.lisovskiy@xxxxxxxxx>
> ---
> drivers/gpu/drm/i915/display/intel_cdclk.c | 89 +++++++++++++++++++-
> drivers/gpu/drm/i915/display/intel_cdclk.h | 2 +
> drivers/gpu/drm/i915/display/intel_display.c | 6 ++
> drivers/gpu/drm/i915/i915_reg.h | 4 +
> 4 files changed, 98 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/display/intel_cdclk.c b/drivers/gpu/drm/i915/display/intel_cdclk.c
> index 82da76b586ed..22ba0303ea28 100644
> --- a/drivers/gpu/drm/i915/display/intel_cdclk.c
> +++ b/drivers/gpu/drm/i915/display/intel_cdclk.c
> @@ -1908,10 +1908,10 @@ static void bxt_set_cdclk(struct drm_i915_private *dev_priv,
> * NOOP - No Pcode communication needed for
> * Display versions 14 and beyond
> */;
> - else if (DISPLAY_VER(dev_priv) >= 11)
> + else if (DISPLAY_VER(dev_priv) >= 11 && !IS_DG2(dev_priv))
> ret = snb_pcode_write(&dev_priv->uncore, SKL_PCODE_CDCLK_CONTROL,
> cdclk_config->voltage_level);
> - else
> + if (DISPLAY_VER(dev_priv) < 11) {
> /*
> * The timeout isn't specified, the 2ms used here is based on
> * experiment.
> @@ -1922,7 +1922,7 @@ static void bxt_set_cdclk(struct drm_i915_private *dev_priv,
> HSW_PCODE_DE_WRITE_FREQ_REQ,
> cdclk_config->voltage_level,
> 150, 2);
> -
> + }
> if (ret) {
> drm_err(&dev_priv->drm,
> "PCode CDCLK freq set failed, (err %d, freq %d)\n",
> @@ -2218,6 +2218,34 @@ void intel_cdclk_dump_config(struct drm_i915_private *i915,
> cdclk_config->voltage_level);
> }
>
> +/**
> + * intel_display_to_pcode- inform pcode for display config
> + * @cdclk: current cdclk as per new or old state
> + * @voltage_level: current voltage_level send to Pcode
> + * @active_pipes: active pipes for more accurate power accounting
> + */
kernel-doc is usually discoraged for internal functions.
> +static void intel_display_to_pcode(struct drm_i915_private *dev_priv,
> + unsigned int cdclk, u8 voltage_level,
> + u8 active_pipes)
> +{
> + int ret;
> +
> + if (DISPLAY_VER(dev_priv) >= 12) {
> + ret = skl_pcode_request(&dev_priv->uncore, SKL_PCODE_CDCLK_CONTROL,
> + SKL_CDCLK_PREPARE_FOR_CHANGE |
> + DISPLAY_TO_PCODE_MASK
> + (cdclk, active_pipes, voltage_level),
> + SKL_CDCLK_READY_FOR_CHANGE,
> + SKL_CDCLK_READY_FOR_CHANGE, 3);
> + if (ret) {
> + drm_err(&dev_priv->drm,
> + "Failed to inform PCU about display config (err %d)\n",
> + ret);
> + return;
> + }
> + }
> +}
> +
> /**
> * intel_set_cdclk - Push the CDCLK configuration to the hardware
> * @dev_priv: i915 device
> @@ -2287,6 +2315,61 @@ static void intel_set_cdclk(struct drm_i915_private *dev_priv,
> }
> }
>
> +/**
> + * intel_display_to_pcode_pre_notification: display to pcode notification
> + * before the enabling power wells.
> + * send notification with cdclk, number of pipes, voltage_level.
> + * @state: intel atomic state
> + */
> +void intel_display_to_pcode_pre_notification(struct intel_atomic_state *state)
The function name should indicate what is being
notified. Pre-notification of what? Post-notification of what?
Functions in this file should be prefixed intel_cdclk_*.
> +{
> + struct drm_i915_private *dev_priv = to_i915(state->base.dev);
> + const struct intel_cdclk_state *old_cdclk_state =
> + intel_atomic_get_old_cdclk_state(state);
> + const struct intel_cdclk_state *new_cdclk_state =
> + intel_atomic_get_new_cdclk_state(state);
> + if (!intel_cdclk_changed(&old_cdclk_state->actual,
> + &new_cdclk_state->actual) &&
> + (new_cdclk_state->active_pipes ==
> + old_cdclk_state->active_pipes))
> + return;
> + if (old_cdclk_state->actual.cdclk <= new_cdclk_state->actual.cdclk) {
> + intel_display_to_pcode(dev_priv, new_cdclk_state->actual.cdclk,
> + new_cdclk_state->actual.voltage_level,
> + new_cdclk_state->active_pipes);
> + return;
> + }
> + if (old_cdclk_state->actual.cdclk >= new_cdclk_state->actual.cdclk) {
> + intel_display_to_pcode(dev_priv, old_cdclk_state->actual.cdclk,
> + old_cdclk_state->actual.voltage_level,
> + old_cdclk_state->active_pipes);
> + return;
> + }
> + if (old_cdclk_state->active_pipes != new_cdclk_state->active_pipes) {
> + intel_display_to_pcode(dev_priv, new_cdclk_state->actual.cdclk,
> + new_cdclk_state->actual.voltage_level,
> + new_cdclk_state->active_pipes);
> + return;
> + }
> + intel_display_to_pcode(dev_priv, DISPLAY_TO_PCODE_CDCLK_MAX,
> + new_cdclk_state->actual.voltage_level,
> + new_cdclk_state->active_pipes);
> +}
> +
> +/*intel_display_to_pcode_post_notification: after frequency change sending
> + * voltage_level, active pipes, current CDCLK frequency.
> + * @state: intel atomic state
> + */
> +void intel_display_to_pcode_post_notification(struct intel_atomic_state *state)
> +{
> + struct drm_i915_private *dev_priv = to_i915(state->base.dev);
> + const struct intel_cdclk_state *new_cdclk_state =
> + intel_atomic_get_new_cdclk_state(state);
> + intel_display_to_pcode(dev_priv, new_cdclk_state->actual.cdclk,
> + new_cdclk_state->actual.voltage_level,
> + new_cdclk_state->active_pipes);
> +}
> +
> /**
> * intel_set_cdclk_pre_plane_update - Push the CDCLK state to the hardware
> * @state: intel atomic state
> diff --git a/drivers/gpu/drm/i915/display/intel_cdclk.h b/drivers/gpu/drm/i915/display/intel_cdclk.h
> index 51e2f6a11ce4..95d9d39d63be 100644
> --- a/drivers/gpu/drm/i915/display/intel_cdclk.h
> +++ b/drivers/gpu/drm/i915/display/intel_cdclk.h
> @@ -64,6 +64,8 @@ bool intel_cdclk_needs_modeset(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);
> +void intel_display_to_pcode_pre_notification(struct intel_atomic_state *state);
> +void intel_display_to_pcode_post_notification(struct intel_atomic_state *state);
> void intel_cdclk_dump_config(struct drm_i915_private *i915,
> const struct intel_cdclk_config *cdclk_config,
> const char *context);
> diff --git a/drivers/gpu/drm/i915/display/intel_display.c b/drivers/gpu/drm/i915/display/intel_display.c
> index 166662ade593..af0f0840e4b8 100644
> --- a/drivers/gpu/drm/i915/display/intel_display.c
> +++ b/drivers/gpu/drm/i915/display/intel_display.c
> @@ -7462,6 +7462,9 @@ static void intel_atomic_commit_tail(struct intel_atomic_state *state)
>
> intel_atomic_prepare_plane_clear_colors(state);
>
> + if (IS_DG2(dev_priv))
> + intel_display_to_pcode_pre_notification(state);
> +
This is very high level code and platform checks don't belong
here. Let's not start now.
> for_each_oldnew_intel_crtc_in_state(state, crtc, old_crtc_state,
> new_crtc_state, i) {
> if (intel_crtc_needs_modeset(new_crtc_state) ||
> @@ -7483,6 +7486,9 @@ static void intel_atomic_commit_tail(struct intel_atomic_state *state)
> intel_modeset_verify_disabled(dev_priv, state);
> }
>
> + if (IS_DG2(dev_priv))
> + intel_display_to_pcode_post_notification(state);
> +
> intel_sagv_pre_plane_update(state);
>
> /* Complete the events for pipes that have now been disabled */
> diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
> index 596efc940ee7..b90c31862083 100644
> --- a/drivers/gpu/drm/i915/i915_reg.h
> +++ b/drivers/gpu/drm/i915/i915_reg.h
> @@ -6498,6 +6498,10 @@
> #define ICL_PCODE_MEM_SS_READ_GLOBAL_INFO (0x0 << 8)
> #define ICL_PCODE_MEM_SS_READ_QGV_POINT_INFO(point) (((point) << 16) | (0x1 << 8))
> #define ADL_PCODE_MEM_SS_READ_PSF_GV_INFO ((0) | (0x2 << 8))
> +#define DISPLAY_TO_PCODE_CDCLK_MAX 0x28D
> +#define DISPLAY_TO_PCODE_MASK(cdclk, num_pipes, voltage_level) \
> + ((1 << 31) | (num_pipes << 28) | \
> + (cdclk << 16) | (1 << 27) | voltage_level)
> #define ICL_PCODE_SAGV_DE_MEM_SS_CONFIG 0xe
> #define ICL_PCODE_REP_QGV_MASK REG_GENMASK(1, 0)
> #define ICL_PCODE_REP_QGV_SAFE REG_FIELD_PREP(ICL_PCODE_REP_QGV_MASK, 0)
--
Jani Nikula, Intel Open Source Graphics Center
