[Intel-gfx] [PATCH] drm/i915/display: Communicate display power demands to pcode more accurately
Jani Nikula
jani.nikula at linux.intel.com
Tue Mar 7 10:23:59 UTC 2023
On Tue, 07 Mar 2023, "Lisovskiy, Stanislav" <stanislav.lisovskiy at intel.com> wrote:
> On Mon, Mar 06, 2023 at 08:14:35PM +0200, Jani Nikula wrote:
>> On Mon, 27 Feb 2023, Stanislav Lisovskiy <stanislav.lisovskiy at intel.com> wrote:
>> > Display to communicate display pipe count/CDCLK/voltage configuration
>> > to Pcode for more accurate power accounting for gen >= 12.
>> > 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 pipe power well will disable or enable.
>> >
>> > v2: - Make intel_cdclk_need_serialize static to make CI compiler happy.
>> >
>> > Signed-off-by: Stanislav Lisovskiy <stanislav.lisovskiy at intel.com>
>> > ---
>> > drivers/gpu/drm/i915/display/intel_cdclk.c | 174 +++++++++++++++++++--
>> > drivers/gpu/drm/i915/display/intel_cdclk.h | 2 +
>> > drivers/gpu/drm/i915/i915_reg.h | 14 ++
>> > 3 files changed, 176 insertions(+), 14 deletions(-)
>> >
>> > diff --git a/drivers/gpu/drm/i915/display/intel_cdclk.c b/drivers/gpu/drm/i915/display/intel_cdclk.c
>> > index 084a483f9776..df5a21f6a393 100644
>> > --- a/drivers/gpu/drm/i915/display/intel_cdclk.c
>> > +++ b/drivers/gpu/drm/i915/display/intel_cdclk.c
>> > @@ -1932,10 +1932,10 @@ 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.
>> > @@ -1946,7 +1946,7 @@ 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",
>> > @@ -2242,6 +2242,40 @@ void intel_cdclk_dump_config(struct drm_i915_private *i915,
>> > cdclk_config->voltage_level);
>> > }
>> >
>> > +static void intel_pcode_notify(struct drm_i915_private *i915,
>> > + u8 voltage_level,
>> > + u8 active_pipe_count,
>> > + u8 cdclk,
How can that be u8?
>> > + bool cdclk_update_valid,
>> > + bool pipe_count_update_valid)
Also not super happy about the flags arguments... could have cdclk == 0
means not valid and int active_pipe_count == -1 means not valid. Maybe.
>> > +{
>> > + int ret;
>> > + u32 update_mask = 0;
>> > +
>> > + if (DISPLAY_VER(i915) < 12)
>> > + return;
>> > +
>> > + update_mask = DISPLAY_TO_PCODE_UPDATE_MASK(cdclk, active_pipe_count, voltage_level);
>> > +
>> > + if (cdclk_update_valid)
>> > + update_mask |= DISPLAY_TO_PCODE_CDCLK_VALID;
>> > +
>> > + if (pipe_count_update_valid)
>> > + update_mask |= DISPLAY_TO_PCODE_PIPE_COUNT_VALID;
>> > +
>> > + ret = skl_pcode_request(&i915->uncore, SKL_PCODE_CDCLK_CONTROL,
>> > + SKL_CDCLK_PREPARE_FOR_CHANGE |
>> > + update_mask,
>> > + SKL_CDCLK_READY_FOR_CHANGE,
>> > + SKL_CDCLK_READY_FOR_CHANGE, 3);
>> > + if (ret) {
>> > + drm_err(&i915->drm,
>> > + "Failed to inform PCU about display config (err %d)\n",
>> > + ret);
>> > + return;
>>
>> Superfluous return.
>>
>> > + }
>> > +}
>> > +
>> > /**
>> > * intel_set_cdclk - Push the CDCLK configuration to the hardware
>> > * @dev_priv: i915 device
>> > @@ -2311,6 +2345,98 @@ static void intel_set_cdclk(struct drm_i915_private *dev_priv,
>> > }
>> > }
>> >
>> > +/**
>> > + * intel_cdclk_power_usage_to_pcode_pre_notification: display to pcode notification
This doesn't need to be a kernel-doc comment (and it's a malformed one
at that). Ditto for the others.
>> > + * before the enabling power wells.
>> > + * send notification with cdclk, number of pipes, voltage_level.
>> > + * @state: intel atomic state
>> > + */
>> > +void intel_cdclk_power_usage_to_pcode_pre_notification(struct intel_atomic_state *state)
>>
>> This could be static?
>>
>> Not happy with the name, really, but at least it could use a
>> verb. Notify instead of notification.
>
> Any hint for better naming?
Maybe just intel_cdclk_pcode_pre_notify(),
intel_cdclk_pcode_post_notify(), and then intel_cdclk_pcode_notify() as
the shared thing?
>
>>
>> > +{
>> > + struct drm_i915_private *dev_priv = to_i915(state->base.dev);
>>
>> No new dev_priv please.
>>
>> > + 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);
>> > + unsigned int cdclk = 0; u8 voltage_level, num_active_pipes = 0;
>> > + bool change_cdclk, update_pipe_count;
>> > +
>> > + if (!intel_cdclk_changed(&old_cdclk_state->actual,
>> > + &new_cdclk_state->actual) &&
>> > + (new_cdclk_state->active_pipes ==
>> > + old_cdclk_state->active_pipes))
>> > + return;
>> > +
>> > + /* According to "Sequence Before Frequency Change", voltage level set to 0x3 */
>> > + voltage_level = DISPLAY_TO_PCODE_VOLTAGE_MAX;
>> > +
>> > + change_cdclk = new_cdclk_state->actual.cdclk != old_cdclk_state->actual.cdclk;
>> > + update_pipe_count = hweight8(new_cdclk_state->active_pipes) >
>> > + hweight8(old_cdclk_state->active_pipes);
>> > +
>> > + /*
>> > + * According to "Sequence Before Frequency Change",
>> > + * if CDCLK is increasing, set bits 25:16 to upcoming CDCLK,
>> > + * if CDCLK is decreasing or not changing, set bits 25:16 to current CDCLK,
>> > + * which basically means we choose the maximum of old and new CDCLK, if we know both
>> > + */
>> > + if (change_cdclk)
>> > + cdclk = max(new_cdclk_state->actual.cdclk, old_cdclk_state->actual.cdclk);
>> > +
>> > + /*
>> > + * According to "Sequence For Pipe Count Change",
>> > + * if pipe count is increasing, set bits 25:16 to upcoming pipe count
>> > + * (power well is enabled)
>> > + * no action if it is decreasing, before the change
>> > + */
>> > + if (update_pipe_count)
>> > + num_active_pipes = hweight8(new_cdclk_state->active_pipes);
>> > +
>> > + intel_pcode_notify(dev_priv, voltage_level, num_active_pipes, cdclk,
>> > + change_cdclk, update_pipe_count);
>> > +}
>> > +
>> > +/* intel_cdclk_power_usage_to_pcode_post_notification: after frequency change sending
>> > + * voltage_level, active pipes, current CDCLK frequency.
>> > + * @state: intel atomic state
>> > + */
>> > +void intel_cdclk_power_usage_to_pcode_post_notification(struct intel_atomic_state *state)
>>
>> Ditto about static & naming.
>>
>> > +{
>> > + struct drm_i915_private *dev_priv = to_i915(state->base.dev);
>>
>> No new dev_priv please.
>>
>> > + const struct intel_cdclk_state *new_cdclk_state =
>> > + intel_atomic_get_new_cdclk_state(state);
>> > + const struct intel_cdclk_state *old_cdclk_state =
>> > + intel_atomic_get_old_cdclk_state(state);
>> > + unsigned int cdclk = 0; u8 voltage_level, num_active_pipes = 0;
>> > + bool update_cdclk, update_pipe_count;
>> > +
>> > + /* According to "Sequence After Frequency Change", set voltage to used level */
>> > + voltage_level = new_cdclk_state->actual.voltage_level;
>> > +
>> > + update_cdclk = new_cdclk_state->actual.cdclk != old_cdclk_state->actual.cdclk;
>> > + update_pipe_count = hweight8(new_cdclk_state->active_pipes) <
>> > + hweight8(old_cdclk_state->active_pipes);
>> > +
>> > + /*
>> > + * According to "Sequence After Frequency Change",
>> > + * set bits 25:16 to current CDCLK
>> > + */
>> > + if (update_cdclk)
>> > + cdclk = new_cdclk_state->actual.cdclk;
>> > +
>> > + /*
>> > + * According to "Sequence For Pipe Count Change",
>> > + * if pipe count is decreasing, set bits 25:16 to current pipe count,
>> > + * after the change(power well is disabled)
>> > + * no action if it is increasing, after the change
>> > + */
>> > + if (update_pipe_count)
>> > + num_active_pipes = hweight8(new_cdclk_state->active_pipes);
>> > +
>> > + intel_pcode_notify(dev_priv, voltage_level, num_active_pipes, cdclk,
>> > + update_cdclk, update_pipe_count);
>> > +}
>> > +
>> > /**
>> > * intel_set_cdclk_pre_plane_update - Push the CDCLK state to the hardware
>> > * @state: intel atomic state
>> > @@ -2321,7 +2447,7 @@ static void intel_set_cdclk(struct drm_i915_private *dev_priv,
>> > void
>> > intel_set_cdclk_pre_plane_update(struct intel_atomic_state *state)
>> > {
>> > - struct drm_i915_private *dev_priv = to_i915(state->base.dev);
>> > + struct drm_i915_private *i915 = 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 =
>> > @@ -2332,11 +2458,14 @@ intel_set_cdclk_pre_plane_update(struct intel_atomic_state *state)
>> > &new_cdclk_state->actual))
>> > return;
>> >
>> > + if (DISPLAY_VER(i915) >= 12)
>> > + intel_cdclk_power_usage_to_pcode_pre_notification(state);
>> > +
>> > if (pipe == INVALID_PIPE ||
>> > old_cdclk_state->actual.cdclk <= new_cdclk_state->actual.cdclk) {
>> > - drm_WARN_ON(&dev_priv->drm, !new_cdclk_state->base.changed);
>> > + drm_WARN_ON(&i915->drm, !new_cdclk_state->base.changed);
>> >
>> > - intel_set_cdclk(dev_priv, &new_cdclk_state->actual, pipe);
>> > + intel_set_cdclk(i915, &new_cdclk_state->actual, pipe);
>> > }
>> > }
>> >
>> > @@ -2350,7 +2479,7 @@ intel_set_cdclk_pre_plane_update(struct intel_atomic_state *state)
>> > void
>> > intel_set_cdclk_post_plane_update(struct intel_atomic_state *state)
>> > {
>> > - struct drm_i915_private *dev_priv = to_i915(state->base.dev);
>> > + struct drm_i915_private *i915 = 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 =
>> > @@ -2361,11 +2490,14 @@ intel_set_cdclk_post_plane_update(struct intel_atomic_state *state)
>> > &new_cdclk_state->actual))
>> > return;
>> >
>> > + if (DISPLAY_VER(i915) >= 12)
>> > + intel_cdclk_power_usage_to_pcode_post_notification(state);
>> > +
>> > if (pipe != INVALID_PIPE &&
>> > old_cdclk_state->actual.cdclk > new_cdclk_state->actual.cdclk) {
>> > - drm_WARN_ON(&dev_priv->drm, !new_cdclk_state->base.changed);
>> > + drm_WARN_ON(&i915->drm, !new_cdclk_state->base.changed);
>> >
>> > - intel_set_cdclk(dev_priv, &new_cdclk_state->actual, pipe);
>> > + intel_set_cdclk(i915, &new_cdclk_state->actual, pipe);
>> > }
>> > }
>> >
>> > @@ -2871,6 +3003,21 @@ int intel_cdclk_init(struct drm_i915_private *dev_priv)
>> > return 0;
>> > }
>> >
>> > +static bool intel_cdclk_need_serialize(struct drm_i915_private *i915,
>> > + const struct intel_cdclk_state *old_cdclk_state,
>> > + const struct intel_cdclk_state *new_cdclk_state)
>> > +{
>> > + /*
>> > + * We need to poke hw for gen >= 12, because we notify PCode if
>> > + * pipe power well count changes.
>> > + */
>> > + return intel_cdclk_changed(&old_cdclk_state->actual,
>> > + &new_cdclk_state->actual) ||
>> > + ((DISPLAY_VER(i915) >= 12 &&
>> > + hweight8(old_cdclk_state->active_pipes) !=
>> > + hweight8(new_cdclk_state->active_pipes)));
>>
>> That's getting a bit unweildy for one expression.
>>
>> > +}
>> > +
>> > int intel_modeset_calc_cdclk(struct intel_atomic_state *state)
>> > {
>> > struct drm_i915_private *dev_priv = to_i915(state->base.dev);
>> > @@ -2892,8 +3039,7 @@ int intel_modeset_calc_cdclk(struct intel_atomic_state *state)
>> > if (ret)
>> > return ret;
>> >
>> > - if (intel_cdclk_changed(&old_cdclk_state->actual,
>> > - &new_cdclk_state->actual)) {
>> > + if (intel_cdclk_need_serialize(dev_priv, old_cdclk_state, new_cdclk_state)) {
>> > /*
>> > * Also serialize commits across all crtcs
>> > * if the actual hw needs to be poked.
>> > @@ -2905,9 +3051,9 @@ int intel_modeset_calc_cdclk(struct intel_atomic_state *state)
>> > old_cdclk_state->force_min_cdclk != new_cdclk_state->force_min_cdclk ||
>> > intel_cdclk_changed(&old_cdclk_state->logical,
>> > &new_cdclk_state->logical)) {
>> > - ret = intel_atomic_lock_global_state(&new_cdclk_state->base);
>> > - if (ret)
>> > - return ret;
>> > + ret = intel_atomic_lock_global_state(&new_cdclk_state->base);
>> > + if (ret)
>> > + return ret;
Accidental indentation change?
>> > } else {
>> > return 0;
>> > }
>> > diff --git a/drivers/gpu/drm/i915/display/intel_cdclk.h b/drivers/gpu/drm/i915/display/intel_cdclk.h
>> > index 51e2f6a11ce4..fa356adc61d9 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_cdclk_power_usage_to_pcode_pre_notification(struct intel_atomic_state *state);
>> > +void intel_cdclk_power_usage_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/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
>> > index c1efa655fb68..9f786952585b 100644
>> > --- a/drivers/gpu/drm/i915/i915_reg.h
>> > +++ b/drivers/gpu/drm/i915/i915_reg.h
>> > @@ -6526,6 +6526,20 @@
>> > #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_VOLTAGE_MASK REG_GENMASK(1, 0)
>> > +#define DISPLAY_TO_PCODE_VOLTAGE_MAX DISPLAY_TO_PCODE_VOLTAGE_MASK
>> > +#define DISPLAY_TO_PCODE_CDCLK_VALID REG_BIT(27)
>> > +#define DISPLAY_TO_PCODE_PIPE_COUNT_VALID REG_BIT(31)
>> > +#define DISPLAY_TO_PCODE_CDCLK_MASK REG_GENMASK(25, 16)
>> > +#define DISPLAY_TO_PCODE_PIPE_COUNT_MASK REG_GENMASK(30, 28)
>> > +#define DISPLAY_TO_PCODE_CDCLK(x) REG_FIELD_PREP(DISPLAY_TO_PCODE_CDCLK_MASK, (x))
>> > +#define DISPLAY_TO_PCODE_PIPE_COUNT(x) REG_FIELD_PREP(DISPLAY_TO_PCODE_PIPE_COUNT_MASK, (x))
>> > +#define DISPLAY_TO_PCODE_VOLTAGE(x) REG_FIELD_PREP(DISPLAY_TO_PCODE_VOLTAGE_MASK, (x))
>> > +#define DISPLAY_TO_PCODE_UPDATE_MASK(cdclk, num_pipes, voltage_level) \
>> > + (DISPLAY_TO_PCODE_CDCLK(cdclk)) | \
>> > + (DISPLAY_TO_PCODE_PIPE_COUNT(num_pipes)) | \
>> > + (DISPLAY_TO_PCODE_VOLTAGE(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
--
Jani Nikula, Intel Open Source Graphics Center
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