On Fri, Oct 05, 2018 at 04:23:04PM -0700, Manasi Navare wrote:
> A separate power well 2 (PG2) is required for VDSC on eDP transcoder
> whereas all other transcoders use the power wells associated with the
> transcoders for VDSC.
> This patch adds a helper to obtain correct power domain depending on
> transcoder being used and enables/disables the power wells during
> VDSC enabling/disabling.
>
> Suggested-by: Ville Syrjala <ville.syrj...@linux.intel.com>
> Cc: Ville Syrjala <ville.syrj...@linux.intel.com>
> Cc: Imre Deak <imre.d...@intel.com>
> Cc: Rodrigo Vivi <rodrigo.v...@intel.com>
> Signed-off-by: Manasi Navare <manasi.d.nav...@intel.com>
> ---
> drivers/gpu/drm/i915/intel_vdsc.c | 25 +++++++++++++++++++++++++
> 1 file changed, 25 insertions(+)
>
> diff --git a/drivers/gpu/drm/i915/intel_vdsc.c
> b/drivers/gpu/drm/i915/intel_vdsc.c
> index 4963e80a87f0..d2b4601459c3 100644
> --- a/drivers/gpu/drm/i915/intel_vdsc.c
> +++ b/drivers/gpu/drm/i915/intel_vdsc.c
> @@ -581,6 +581,23 @@ int intel_dp_compute_dsc_params(struct intel_dp
> *intel_dp,
> return 0;
> }
>
> +static enum intel_display_power_domain
> +intel_dsc_get_power_domains(struct intel_crtc_state *crtc_state)
crtc_state can be const.
> +{
> + enum transcoder cpu_transcoder = crtc_state->cpu_transcoder;
> +
> + /*
> + * On ICL+ PW2/ POWER_DOMAIN_VDSC_PIPE_A is required for
Tabs fail in this comment.
> + * VDSC/joining for eDP transcoder.
> + * For any other transcoder, VDSC/joining uses the power well
> associated
> + * with the pipe/transcoder in use.
The one thing I'd like the comment to explain is why the power
domain is called PIPE_A_something but we pick it based on the
transcoder.
Maybe?
/*
* Only the eDP/DSI VDSC (ICL) and the pipe A VDSC (*something*)
* have their own power well. For the other VDSCs another
* reference for the transcoder (ICL) or pipe (*something*) will
* suffice.
*
* To avoid wasting power domain bits we reuse the PIPE_A_VDSC
* power domain for both the eDP/DSI VDSC (ICL) and the
* pipe A VDSC (*something*).
*/
Not sure if we can fill the *something* yet :)
Or maybe with the aliasing TRANSCODER_EDP_VDSC idea we
wouldn't really need to explain so much So maybe just
something simpler like
/*
* Only eDP/DSI VDSC has its own power well. For the other
* VDSCs another reference on the transcoder power domain
* will suffice.
*/
and then we'd add the same comment with s/transcoder/pipe/ for
the next platform.
Anyways, just thinking out loud. If you want you can go with
what you have with the const/tabs fixed.
Reviewed-by: Ville Syrjälä <ville.syrj...@linux.intel.com>
> + */
> + if (cpu_transcoder == TRANSCODER_EDP)
> + return POWER_DOMAIN_VDSC_PIPE_A;
> + else
> + return POWER_DOMAIN_TRANSCODER(cpu_transcoder);
> +}
> +
> static void intel_configure_pps_for_dsc_encoder(struct intel_encoder
> *encoder,
> struct intel_crtc_state
> *crtc_state)
> {
> @@ -1019,6 +1036,10 @@ void intel_dsc_enable(struct intel_encoder *encoder,
> if (!crtc_state->dsc_params.compression_enable)
> return;
>
> + /* Enable Power wells for VDSC/joining */
> + intel_display_power_get(dev_priv,
> + intel_dsc_get_power_domains(crtc_state));
> +
> intel_configure_pps_for_dsc_encoder(encoder, crtc_state);
>
> intel_dp_send_dsc_pps_sdp(encoder, crtc_state);
> @@ -1073,4 +1094,8 @@ void intel_dsc_disable(struct intel_encoder *encoder,
> RIGHT_BRANCH_VDSC_ENABLE);
> I915_WRITE(dss_ctl2_reg, dss_ctl2_val);
>
> + /* Disable Power wells for VDSC/joining */
> + intel_display_power_put(dev_priv,
> + intel_dsc_get_power_domains(old_crtc_state));
> +
> }
> --
> 2.18.0
--
Ville Syrjälä
Intel
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