On Fri, Sep 13, 2019 at 01:53:36PM +0530, Anshuman Gupta wrote:
> DC3CO enabling B.Specs sequence requires to enable end configure
> exit scanlines to TRANS_EXITLINE register, programming this register
> has to be part of modeset sequence as this can't be change when
> transcoder or port is enabled.
> When system boots with only eDP panel there may not be real
> modeset as BIOS has already programmed the necessary registers,
> therefore it needs to force a modeset to enable and configure
> DC3CO exitline.
>
> Cc: Jani Nikula <jani.nikula@xxxxxxxxx>
> Cc: Imre Deak <imre.deak@xxxxxxxxx>
> Cc: Animesh Manna <animesh.manna@xxxxxxxxx>
> Signed-off-by: Anshuman Gupta <anshuman.gupta@xxxxxxxxx>
You missed my review comments on v7:
- Computing the state should be done from a DP encoder compute config
hook, which will then make tgl_dc3co_is_edp_connected() redundant.
- Instead of has_dc3co_exitline dc3co_exitline should be computed (and
read out), which could be used then when we need to program it.
> ---
> drivers/gpu/drm/i915/display/intel_display.c | 5 +
> .../drm/i915/display/intel_display_power.c | 104 ++++++++++++++++++
> .../drm/i915/display/intel_display_power.h | 7 ++
> .../drm/i915/display/intel_display_types.h | 1 +
> drivers/gpu/drm/i915/intel_pm.c | 2 +-
> drivers/gpu/drm/i915/intel_pm.h | 2 +
> 6 files changed, 120 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/gpu/drm/i915/display/intel_display.c b/drivers/gpu/drm/i915/display/intel_display.c
> index a19f8c73f2e0..6b7b8d2112a5 100644
> --- a/drivers/gpu/drm/i915/display/intel_display.c
> +++ b/drivers/gpu/drm/i915/display/intel_display.c
> @@ -7409,6 +7409,8 @@ static int intel_crtc_compute_config(struct intel_crtc *crtc,
> const struct drm_display_mode *adjusted_mode = &pipe_config->base.adjusted_mode;
> int clock_limit = dev_priv->max_dotclk_freq;
>
> + tgl_dc3co_crtc_compute_config(dev_priv, pipe_config);
> +
> if (INTEL_GEN(dev_priv) < 4) {
> clock_limit = dev_priv->max_cdclk_freq * 9 / 10;
>
> @@ -10474,6 +10476,8 @@ static bool haswell_get_pipe_config(struct intel_crtc *crtc,
> pipe_config->pixel_multiplier = 1;
> }
>
> + tgl_dc3co_crtc_get_config(pipe_config);
> +
> out:
> for_each_power_domain(power_domain, power_domain_mask)
> intel_display_power_put(dev_priv,
> @@ -12739,6 +12743,7 @@ intel_pipe_config_compare(const struct intel_crtc_state *current_config,
>
> PIPE_CONF_CHECK_I(pixel_multiplier);
> PIPE_CONF_CHECK_I(output_format);
> + PIPE_CONF_CHECK_BOOL(has_dc3co_exitline);
> PIPE_CONF_CHECK_BOOL(has_hdmi_sink);
> if ((INTEL_GEN(dev_priv) < 8 && !IS_HASWELL(dev_priv)) ||
> IS_VALLEYVIEW(dev_priv) || IS_CHERRYVIEW(dev_priv))
> diff --git a/drivers/gpu/drm/i915/display/intel_display_power.c b/drivers/gpu/drm/i915/display/intel_display_power.c
> index 7965e07257a0..42eabcdecf00 100644
> --- a/drivers/gpu/drm/i915/display/intel_display_power.c
> +++ b/drivers/gpu/drm/i915/display/intel_display_power.c
> @@ -19,6 +19,7 @@
> #include "intel_hotplug.h"
> #include "intel_sideband.h"
> #include "intel_tc.h"
> +#include "intel_pm.h"
>
> bool intel_display_power_well_is_enabled(struct drm_i915_private *dev_priv,
> enum i915_power_well_id power_well_id);
> @@ -772,6 +773,109 @@ static void gen9_set_dc_state(struct drm_i915_private *dev_priv, u32 state)
> dev_priv->csr.dc_state = val & mask;
> }
>
> +void tgl_disable_psr2_transcoder_exitline(const struct intel_crtc_state *cstate)
> +{
> + struct drm_i915_private *dev_priv = to_i915(cstate->base.crtc->dev);
> + u32 val;
> +
> + if (!cstate->has_dc3co_exitline)
> + return;
> +
> + val = I915_READ(EXITLINE(cstate->cpu_transcoder));
> + val &= ~EXITLINE_ENABLE;
> + I915_WRITE(EXITLINE(cstate->cpu_transcoder), val);
> +}
> +
> +void tgl_enable_psr2_transcoder_exitline(const struct intel_crtc_state *cstate)
> +{
> + u32 linetime_us, val, exit_scanlines;
> + u32 crtc_vdisplay = cstate->base.adjusted_mode.crtc_vdisplay;
> + struct drm_i915_private *dev_priv = to_i915(cstate->base.crtc->dev);
> +
> + if (!cstate->has_dc3co_exitline)
> + return;
> +
> + linetime_us = fixed16_to_u32_round_up(intel_get_linetime_us(cstate));
> + if (WARN_ON(!linetime_us))
> + return;
> + /*
> + * DC3CO Exit time 200us B.Spec 49196
> + * PSR2 transcoder Early Exit scanlines = ROUNDUP(200 / line time) + 1
> + * Exit line event need to program above calculated scan lines before
> + * next VBLANK.
> + */
> + exit_scanlines = DIV_ROUND_UP(200, linetime_us) + 1;
> + if (WARN_ON(exit_scanlines > crtc_vdisplay))
> + return;
> +
> + exit_scanlines = crtc_vdisplay - exit_scanlines;
> + exit_scanlines <<= EXITLINE_SHIFT;
> + val = I915_READ(EXITLINE(cstate->cpu_transcoder));
> + val &= ~(EXITLINE_MASK | EXITLINE_ENABLE);
> + val |= exit_scanlines;
> + val |= EXITLINE_ENABLE;
> + I915_WRITE(EXITLINE(cstate->cpu_transcoder), val);
> +}
> +
> +static bool tgl_dc3co_is_edp_connected(struct intel_crtc_state *crtc_state)
> +{
> + struct drm_atomic_state *state = crtc_state->base.state;
> + struct drm_connector *connector;
> + struct drm_connector_state *connector_state;
> + int i;
> +
> + for_each_new_connector_in_state(state, connector, connector_state, i) {
> + if (connector->status == connector_status_connected &&
> + connector->connector_type == DRM_MODE_CONNECTOR_eDP) {
> + return true;
> + }
> + }
> +
> + return false;
> +}
> +
> +/*
> + * DC3CO requires to enable exitline and program DC3CO requires
> + * exit scanlines to TRANS_EXITLINE register, which should only
> + * change before transcoder or port are enabled.
> + * This requires to disable the fastset at boot for eDP output.
> + */
> +void tgl_dc3co_crtc_compute_config(struct drm_i915_private *dev_priv,
> + struct intel_crtc_state *crtc_state)
> +{
> + if (!IS_TIGERLAKE(dev_priv))
> + return;
> +
> + if (!(dev_priv->csr.allowed_dc_mask & DC_STATE_EN_DC3CO))
> + return;
> +
> + if (crtc_state->has_psr2 && crtc_state->base.active) {
> + if (tgl_dc3co_is_edp_connected(crtc_state))
> + crtc_state->has_dc3co_exitline = true;
> + }
> +}
> +
> +void tgl_dc3co_crtc_get_config(struct intel_crtc_state *crtc_state)
> +{
> + u32 val;
> + struct drm_i915_private *dev_priv = to_i915(crtc_state->base.crtc->dev);
> +
> + if (!IS_TIGERLAKE(dev_priv))
> + return;
> +
> + if (!(dev_priv->csr.allowed_dc_mask & DC_STATE_EN_DC3CO))
> + return;
> +
> + /* DC3CO and PSR2 is supported only on TRANSCODER_A */
> + if (crtc_state->cpu_transcoder != TRANSCODER_A)
> + return;
> +
> + val = I915_READ(EXITLINE(crtc_state->cpu_transcoder));
> +
> + if (val & EXITLINE_ENABLE)
> + crtc_state->has_dc3co_exitline = true;
> +}
> +
> static void
> allowed_dc_mask_to_target_dc_state(struct drm_i915_private *dev_priv)
> {
> diff --git a/drivers/gpu/drm/i915/display/intel_display_power.h b/drivers/gpu/drm/i915/display/intel_display_power.h
> index 13fc705799fd..bf68f26a5a37 100644
> --- a/drivers/gpu/drm/i915/display/intel_display_power.h
> +++ b/drivers/gpu/drm/i915/display/intel_display_power.h
> @@ -12,6 +12,8 @@
>
> struct drm_i915_private;
> struct intel_encoder;
> +struct intel_crtc_state;
> +struct intel_atomic_state;
>
> enum intel_display_power_domain {
> POWER_DOMAIN_DISPLAY_CORE,
> @@ -258,6 +260,11 @@ void intel_display_power_resume_early(struct drm_i915_private *i915);
> void intel_display_power_suspend(struct drm_i915_private *i915);
> void intel_display_power_resume(struct drm_i915_private *i915);
> void tgl_set_target_dc_state(struct drm_i915_private *dev_priv, u32 state);
> +void tgl_dc3co_crtc_compute_config(struct drm_i915_private *dev_priv,
> + struct intel_crtc_state *crtc_state);
> +void tgl_dc3co_crtc_get_config(struct intel_crtc_state *crtc_state);
> +void tgl_disable_psr2_transcoder_exitline(const struct intel_crtc_state *state);
> +void tgl_enable_psr2_transcoder_exitline(const struct intel_crtc_state *state);
>
> const char *
> intel_display_power_domain_str(enum intel_display_power_domain domain);
> diff --git a/drivers/gpu/drm/i915/display/intel_display_types.h b/drivers/gpu/drm/i915/display/intel_display_types.h
> index d5cc4b810d9e..22f8fe0a34d0 100644
> --- a/drivers/gpu/drm/i915/display/intel_display_types.h
> +++ b/drivers/gpu/drm/i915/display/intel_display_types.h
> @@ -871,6 +871,7 @@ struct intel_crtc_state {
>
> bool has_psr;
> bool has_psr2;
> + bool has_dc3co_exitline;
>
> /*
> * Frequence the dpll for the port should run at. Differs from the
> diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c
> index d0ceb272551f..5679d1c1d560 100644
> --- a/drivers/gpu/drm/i915/intel_pm.c
> +++ b/drivers/gpu/drm/i915/intel_pm.c
> @@ -4588,7 +4588,7 @@ skl_wm_method2(u32 pixel_rate, u32 pipe_htotal, u32 latency,
> return ret;
> }
>
> -static uint_fixed_16_16_t
> +uint_fixed_16_16_t
> intel_get_linetime_us(const struct intel_crtc_state *crtc_state)
> {
> u32 pixel_rate;
> diff --git a/drivers/gpu/drm/i915/intel_pm.h b/drivers/gpu/drm/i915/intel_pm.h
> index e3573e1e16e3..454e92c06dff 100644
> --- a/drivers/gpu/drm/i915/intel_pm.h
> +++ b/drivers/gpu/drm/i915/intel_pm.h
> @@ -8,6 +8,7 @@
>
> #include <linux/types.h>
>
> +#include "i915_drv.h"
> #include "i915_reg.h"
>
> struct drm_device;
> @@ -76,6 +77,7 @@ u64 intel_rc6_residency_ns(struct drm_i915_private *dev_priv, i915_reg_t reg);
> u64 intel_rc6_residency_us(struct drm_i915_private *dev_priv, i915_reg_t reg);
>
> u32 intel_get_cagf(struct drm_i915_private *dev_priv, u32 rpstat1);
> +uint_fixed_16_16_t intel_get_linetime_us(const struct intel_crtc_state *cstate);
>
> unsigned long i915_chipset_val(struct drm_i915_private *dev_priv);
> unsigned long i915_mch_val(struct drm_i915_private *dev_priv);
> --
> 2.21.0
>
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