[Intel-gfx] [PATCH] drm/i915/display: Communicate display power demands to pcode
Govindapillai, Vinod
vinod.govindapillai at intel.com
Wed May 3 12:06:33 UTC 2023
Hi Stan
On Tue, 2023-04-25 at 11:13 +0300, Stanislav Lisovskiy wrote:
> Display to communicate display pipe count/CDCLK/voltage 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 pipe power well will disable or enable.
>
> v2: - Make intel_cdclk_need_serialize static to make CI compiler happy.
> v3: - Removed redundant return(Jani Nikula)
> - Changed intel_cdclk_power_usage_to_pcode_(pre|post)_notification to be
> static and also naming to intel_cdclk_pcode_(pre|post)_notify(Jani Nikula)
> - Changed u8 to be u16 for cdclk parameter in intel_pcode_notify function,
> as according to BSpec it requires 10 bits(Jani Nikula)
> - Replaced dev_priv's with i915's(Jani Nikula)
> - Simplified expression in intel_cdclk_need_serialize(Jani Nikula)
> - Removed redundant kernel-doc and indentation(Jani Nikula)
> v4: - Fixed some checkpatch warnings
> v5: - According to HW team comments that change should affect only DG2,
> fix correspodent platform check to account this.
>
> Signed-off-by: Stanislav Lisovskiy <stanislav.lisovskiy at intel.com>
> ---
> drivers/gpu/drm/i915/display/intel_cdclk.c | 156 +++++++++++++++++++--
> drivers/gpu/drm/i915/i915_reg.h | 14 ++
> 2 files changed, 159 insertions(+), 11 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/display/intel_cdclk.c
> b/drivers/gpu/drm/i915/display/intel_cdclk.c
> index f6223d8f13b8..1b70c7be92fe 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);
> -
> + }
After this, there is this below code snippet to update pcode for the current voltage_level.
else if (DISPLAY_VER(dev_priv) >= 11)
ret = snb_pcode_write(&dev_priv->uncore, SKL_PCODE_CDCLK_CONTROL,
cdclk_config->voltage_level);
else
Don't you need to handle this part for DG2 as well?
With that,
Reviewed-by: Vinod Govindapillai <vinod.govindapillai at intel.com>
> if (ret) {
> drm_err(&dev_priv->drm,
> "PCode CDCLK freq set failed, (err %d, freq %d)\n",
> @@ -2242,6 +2242,38 @@ 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,
> + u16 cdclk,
> + bool cdclk_update_valid,
> + bool pipe_count_update_valid)
> +{
> + int ret;
> + u32 update_mask = 0;
> +
> + if (!IS_DG2(i915))
> + 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);
> +}
> +
> /**
> * intel_set_cdclk - Push the CDCLK configuration to the hardware
> * @dev_priv: i915 device
> @@ -2311,6 +2343,88 @@ static void intel_set_cdclk(struct drm_i915_private *dev_priv,
> }
> }
>
> +static void intel_cdclk_pcode_pre_notify(struct intel_atomic_state *state)
> +{
> + 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 =
> + 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(i915, voltage_level, num_active_pipes, cdclk,
> + change_cdclk, update_pipe_count);
> +}
> +
> +static void intel_cdclk_pcode_post_notify(struct intel_atomic_state *state)
> +{
> + struct drm_i915_private *i915 = to_i915(state->base.dev);
> + 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(i915, 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 +2435,7 @@ 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 +2446,14 @@ intel_set_cdclk_pre_plane_update(struct intel_atomic_state *state)
> &new_cdclk_state->actual))
> return;
>
> + if (IS_DG2(i915))
> + intel_cdclk_pcode_pre_notify(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 +2467,7 @@ 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 +2478,14 @@ intel_set_cdclk_post_plane_update(struct intel_atomic_state *state)
> &new_cdclk_state->actual))
> return;
>
> + if (IS_DG2(i915))
> + intel_cdclk_pcode_post_notify(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 +2991,21 @@ 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)
> +{
> + bool power_well_cnt_changed = hweight8(old_cdclk_state->active_pipes) !=
> + hweight8(new_cdclk_state->active_pipes);
> + bool cdclk_changed = intel_cdclk_changed(&old_cdclk_state->actual,
> + &new_cdclk_state->actual);
> + /*
> + * We need to poke hw for gen >= 12, because we notify PCode if
> + * pipe power well count changes.
> + */
> + return cdclk_changed || (IS_DG2(i915) && power_well_cnt_changed);
> +}
> +
> int intel_modeset_calc_cdclk(struct intel_atomic_state *state)
> {
> struct drm_i915_private *dev_priv = to_i915(state->base.dev);
> @@ -2892,8 +3027,7 @@ 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.
> diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
> index dde6e91055bd..5eb83f81225a 100644
> --- a/drivers/gpu/drm/i915/i915_reg.h
> +++ b/drivers/gpu/drm/i915/i915_reg.h
> @@ -5346,6 +5346,20 @@
> #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)
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