Hi Ville,
I was looking at your suggestion of extracting the per pipe stuff out.
Currently in hsw_crtc_enable: the Only non per pipe stuff which gets enabled
for the encoders is :
encoder specific is pre_pll_enable(), enable_shared_dpll, encoders_pre_enable
and configure_cpu_transcoder() - All of this
can be put in a function hsw_encoder_configure() or something that can still be
called from with hsw_crtc_enable
Then the remaining can go into a per pipe function that can be called for each
slave pipe
But it means still pretty much splitting the current hsw_crtc_enable into 2
separate functions
Does this refactoring make sense?
Manasi
On Thu, Mar 17, 2022 at 09:14:16PM +0200, Ville Syrjälä wrote:
> On Thu, Mar 17, 2022 at 12:05:47PM -0700, Navare, Manasi wrote:
> > On Thu, Mar 17, 2022 at 08:52:52PM +0200, Ville Syrjälä wrote:
> > > On Tue, Mar 15, 2022 at 04:38:56PM -0700, Manasi Navare wrote:
> > > > This patch abstracts pieces of hsw_crtc_enable corresponding to
> > > > different
> > > > Bspec enable sequence steps into separate functions.
> > > > This helps to call them in a specific order for bigjoiner master/slave
> > > > in a cleaner fashion.
> > > >
> > > > Cc: Ville Syrjälä <ville.syrj...@linux.intel.com>
> > > > Cc: Animesh Manna <animesh.ma...@intel.com>
> > > > Signed-off-by: Manasi Navare <manasi.d.nav...@intel.com>
> > > > ---
> > > > drivers/gpu/drm/i915/display/intel_display.c | 125 ++++++++++---------
> > > > 1 file changed, 66 insertions(+), 59 deletions(-)
> > > >
> > > > diff --git a/drivers/gpu/drm/i915/display/intel_display.c
> > > > b/drivers/gpu/drm/i915/display/intel_display.c
> > > > index eb49973621f0..d8e6466c9fa0 100644
> > > > --- a/drivers/gpu/drm/i915/display/intel_display.c
> > > > +++ b/drivers/gpu/drm/i915/display/intel_display.c
> > > > @@ -1865,24 +1865,6 @@ static void hsw_set_frame_start_delay(const
> > > > struct intel_crtc_state *crtc_state)
> > > > intel_de_write(dev_priv, reg, val);
> > > > }
> > > >
> > > > -static void icl_ddi_bigjoiner_pre_enable(struct intel_atomic_state
> > > > *state,
> > > > - const struct intel_crtc_state
> > > > *crtc_state)
> > > > -{
> > > > - struct intel_crtc *master_crtc = intel_master_crtc(crtc_state);
> > > > -
> > > > - /*
> > > > - * Enable sequence steps 1-7 on bigjoiner master
> > > > - */
> > > > - if (intel_crtc_is_bigjoiner_slave(crtc_state))
> > > > - intel_encoders_pre_pll_enable(state, master_crtc);
> > > > -
> > > > - if (crtc_state->shared_dpll)
> > > > - intel_enable_shared_dpll(crtc_state);
> > > > -
> > > > - if (intel_crtc_is_bigjoiner_slave(crtc_state))
> > > > - intel_encoders_pre_enable(state, master_crtc);
> > > > -}
> > > > -
> > > > static void hsw_configure_cpu_transcoder(const struct intel_crtc_state
> > > > *crtc_state)
> > > > {
> > > > struct intel_crtc *crtc = to_intel_crtc(crtc_state->uapi.crtc);
> > > > @@ -1910,70 +1892,73 @@ static void hsw_configure_cpu_transcoder(const
> > > > struct intel_crtc_state *crtc_sta
> > > > hsw_set_transconf(crtc_state);
> > > > }
> > > >
> > > > -static void hsw_crtc_enable(struct intel_atomic_state *state,
> > > > - struct intel_crtc *crtc)
> > > > +static void hsw_crtc_pre_pll_enable(struct intel_atomic_state *state,
> > > > + const struct intel_crtc_state
> > > > *crtc_state)
> > > > {
> > > > - const struct intel_crtc_state *new_crtc_state =
> > > > - intel_atomic_get_new_crtc_state(state, crtc);
> > > > - struct drm_i915_private *dev_priv = to_i915(crtc->base.dev);
> > > > - enum pipe pipe = crtc->pipe, hsw_workaround_pipe;
> > > > - enum transcoder cpu_transcoder = new_crtc_state->cpu_transcoder;
> > > > - bool psl_clkgate_wa;
> > > > -
> > > > - if (drm_WARN_ON(&dev_priv->drm, crtc->active))
> > > > - return;
> > > > + struct intel_crtc *crtc = to_intel_crtc(crtc_state->uapi.crtc);
> > > >
> > > > - if (!new_crtc_state->bigjoiner_pipes) {
> > > > - intel_encoders_pre_pll_enable(state, crtc);
> > > > + /*
> > > > + * Enable sequence steps 1 - 7 on all pipes
> > > > + */
> > > > + intel_encoders_pre_pll_enable(state, crtc);
> > > > + if (crtc_state->shared_dpll)
> > > > + intel_enable_shared_dpll(crtc_state);
> > > >
> > > > - if (new_crtc_state->shared_dpll)
> > > > - intel_enable_shared_dpll(new_crtc_state);
> > > > + intel_encoders_pre_enable(state, crtc);
> > > > +}
> > > >
> > > > - intel_encoders_pre_enable(state, crtc);
> > > > - } else {
> > > > - icl_ddi_bigjoiner_pre_enable(state, new_crtc_state);
> > > > - }
> > > > +static void hsw_crtc_post_pll_enable(struct intel_atomic_state *state,
> > > > + const struct intel_crtc_state
> > > > *crtc_state)
> > > > +{
> > > > + struct intel_crtc *crtc = to_intel_crtc(crtc_state->uapi.crtc);
> > > > + struct drm_i915_private *dev_priv = to_i915(crtc->base.dev);
> > > > + enum pipe pipe = crtc->pipe, hsw_workaround_pipe;
> > > > + enum transcoder cpu_transcoder = crtc_state->cpu_transcoder;
> > > > + bool psl_clkgate_wa;
> > > >
> > > > - intel_dsc_enable(new_crtc_state);
> > > > + /*
> > > > + * Enable sequence step 8
> > > > + */
> > > > + intel_dsc_enable(crtc_state);
> > > >
> > > > if (DISPLAY_VER(dev_priv) >= 13)
> > > > - intel_uncompressed_joiner_enable(new_crtc_state);
> > > > + intel_uncompressed_joiner_enable(crtc_state);
> > > >
> > > > - intel_set_pipe_src_size(new_crtc_state);
> > > > + intel_set_pipe_src_size(crtc_state);
> > > > if (DISPLAY_VER(dev_priv) >= 9 || IS_BROADWELL(dev_priv))
> > > > - bdw_set_pipemisc(new_crtc_state);
> > > > + bdw_set_pipemisc(crtc_state);
> > > >
> > > > - if (!intel_crtc_is_bigjoiner_slave(new_crtc_state) &&
> > > > + if (!intel_crtc_is_bigjoiner_slave(crtc_state) &&
> > > > !transcoder_is_dsi(cpu_transcoder))
> > > > - hsw_configure_cpu_transcoder(new_crtc_state);
> > > > + hsw_configure_cpu_transcoder(crtc_state);
> > > >
> > > > crtc->active = true;
> > > >
> > > > /* Display WA #1180: WaDisableScalarClockGating: glk */
> > > > psl_clkgate_wa = DISPLAY_VER(dev_priv) == 10 &&
> > > > - new_crtc_state->pch_pfit.enabled;
> > > > + crtc_state->pch_pfit.enabled;
> > > > if (psl_clkgate_wa)
> > > > glk_pipe_scaler_clock_gating_wa(dev_priv, pipe, true);
> > > >
> > > > if (DISPLAY_VER(dev_priv) >= 9)
> > > > - skl_pfit_enable(new_crtc_state);
> > > > + skl_pfit_enable(crtc_state);
> > > > else
> > > > - ilk_pfit_enable(new_crtc_state);
> > > > + ilk_pfit_enable(crtc_state);
> > > >
> > > > /*
> > > > * On ILK+ LUT must be loaded before the pipe is running but
> > > > with
> > > > * clocks enabled
> > > > */
> > > > - intel_color_load_luts(new_crtc_state);
> > > > - intel_color_commit(new_crtc_state);
> > > > + intel_color_load_luts(crtc_state);
> > > > + intel_color_commit(crtc_state);
> > > > /* update DSPCNTR to configure gamma/csc for pipe bottom color
> > > > */
> > > > if (DISPLAY_VER(dev_priv) < 9)
> > > > - intel_disable_primary_plane(new_crtc_state);
> > > > + intel_disable_primary_plane(crtc_state);
> > > >
> > > > - hsw_set_linetime_wm(new_crtc_state);
> > > > + hsw_set_linetime_wm(crtc_state);
> > > >
> > > > if (DISPLAY_VER(dev_priv) >= 11)
> > > > - icl_set_pipe_chicken(new_crtc_state);
> > > > + icl_set_pipe_chicken(crtc_state);
> > > >
> > > > intel_initial_watermarks(state, crtc);
> > > >
> > > > @@ -1984,8 +1969,8 @@ static void hsw_crtc_enable(struct
> > > > intel_atomic_state *state,
> > > > icl_pipe_mbus_enable(crtc, dbuf_state->joined_mbus);
> > > > }
> > > >
> > > > - if (intel_crtc_is_bigjoiner_slave(new_crtc_state))
> > > > - intel_crtc_vblank_on(new_crtc_state);
> > > > + if (intel_crtc_is_bigjoiner_slave(crtc_state))
> > > > + intel_crtc_vblank_on(crtc_state);
> > > >
> > > > intel_encoders_enable(state, crtc);
> > > >
> > > > @@ -1996,7 +1981,7 @@ static void hsw_crtc_enable(struct
> > > > intel_atomic_state *state,
> > > >
> > > > /* If we change the relative order between pipe/planes
> > > > enabling, we need
> > > > * to change the workaround. */
> > > > - hsw_workaround_pipe = new_crtc_state->hsw_workaround_pipe;
> > > > + hsw_workaround_pipe = crtc_state->hsw_workaround_pipe;
> > > > if (IS_HASWELL(dev_priv) && hsw_workaround_pipe !=
> > > > INVALID_PIPE) {
> > > > struct intel_crtc *wa_crtc;
> > > >
> > > > @@ -2007,6 +1992,29 @@ static void hsw_crtc_enable(struct
> > > > intel_atomic_state *state,
> > > > }
> > > > }
> > > >
> > > > +static void hsw_crtc_enable(struct intel_atomic_state *state,
> > > > + struct intel_crtc *crtc)
> > > > +{
> > > > + const struct intel_crtc_state *new_crtc_state =
> > > > + intel_atomic_get_new_crtc_state(state, crtc);
> > > > + struct intel_crtc *slave_crtc;
> > > > + struct drm_i915_private *dev_priv = to_i915(crtc->base.dev);
> > > > +
> > > > + if (drm_WARN_ON(&dev_priv->drm, crtc->active))
> > > > + return;
> > > > +
> > > > + hsw_crtc_pre_pll_enable(state, new_crtc_state);
> > > > +
> > > > + for_each_intel_crtc_in_pipe_mask(&dev_priv->drm, slave_crtc,
> > > > +
> > > > intel_crtc_bigjoiner_slave_pipes(new_crtc_state)) {
> > > > + struct intel_crtc_state *slave_crtc_state =
> > > > + intel_atomic_get_new_crtc_state(state,
> > > > slave_crtc);
> > > > +
> > > > + hsw_crtc_post_pll_enable(state, slave_crtc_state);
> > > > + }
> > > > + hsw_crtc_post_pll_enable(state, new_crtc_state);
> > > > +}
> > >
> > > I suspect this is far too high level for bigjoiner. Eg. there's a bunch
> > > of things already in the disable sequence that seem to need much more
> > > low level sequencing between the joined pipes. So my gut feeling still
> > > is that we want to continue the per-pipe vs. per-transcoder split and
> > > do the joiner loops in lower level code.
> > >
> >
> > But for enable sequence upto all pre_pll_enable needs to happen for master
> > and then post_pll_enable for all slaves first and then master.
>
> We want the enable and disable to be as symmetric as possible. So you
> can't just blindly stare at the enable sequence and ignore what's going
> on in the disable sequence. Otherwise the end result will be a confusing
> mess.
>
> > Hence added the sequencing here. Because like I have split here the
> > post_pll_enable covers Bspec step 8 and hence that needs to happen for all
> > slaves first and then master.
> > I believe this cleans up a lot of bigjoiner special casing.
> >
> > Further like Jani said, I can just make a separate icl_crtc_enable hook and
> > only that will have this sequence.
>
> That doesn't seem particularly helpful if it just means copy-pasting
> the whole hsw_crtc_enable() into two places and removing one or two
> little things from the original.
>
> >
> > Does this make sense as a first refacoring step? This should to scale the
> > code to multiple joiners.
> >
> > Manasi
> >
> > > > +
> > > > void ilk_pfit_disable(const struct intel_crtc_state *old_crtc_state)
> > > > {
> > > > struct intel_crtc *crtc =
> > > > to_intel_crtc(old_crtc_state->uapi.crtc);
> > > > @@ -8122,11 +8130,11 @@ static void intel_enable_crtc(struct
> > > > intel_atomic_state *state,
> > > >
> > > > intel_crtc_update_active_timings(new_crtc_state);
> > > >
> > > > - dev_priv->display->crtc_enable(state, crtc);
> > > > -
> > > > if (intel_crtc_is_bigjoiner_slave(new_crtc_state))
> > > > return;
> > > >
> > > > + dev_priv->display->crtc_enable(state, crtc);
> > > > +
> > > > intel_drrs_enable(new_crtc_state);
> > > >
> > > > /* vblanks work again, re-enable pipe CRC. */
> > > > @@ -8360,8 +8368,7 @@ static void skl_commit_modeset_enables(struct
> > > > intel_atomic_state *state)
> > > > continue;
> > > >
> > > > if (intel_dp_mst_is_slave_trans(new_crtc_state) ||
> > > > - is_trans_port_sync_master(new_crtc_state) ||
> > > > - intel_crtc_is_bigjoiner_master(new_crtc_state))
> > > > + is_trans_port_sync_master(new_crtc_state))
> > > > continue;
> > > >
> > > > modeset_pipes &= ~BIT(pipe);
> > > > @@ -8371,7 +8378,7 @@ static void skl_commit_modeset_enables(struct
> > > > intel_atomic_state *state)
> > > >
> > > > /*
> > > > * Then we enable all remaining pipes that depend on other
> > > > - * pipes: MST slaves and port sync masters, big joiner master
> > > > + * pipes: MST slaves and port sync masters
> > > > */
> > > > for_each_new_intel_crtc_in_state(state, crtc, new_crtc_state,
> > > > i) {
> > > > enum pipe pipe = crtc->pipe;
> > > > --
> > > > 2.19.1
> > >
> > > --
> > > Ville Syrjälä
> > > Intel
>
> --
> Ville Syrjälä
> Intel
