On Wed, 16 Oct 2013 17:25:52 +0300
Imre Deak <imre.deak@xxxxxxxxx> wrote:
> So far the modeset code enabled all power domains if it needed any. It
> wasn't a problem since HW generations so far only had one always-on
> power well and one dynamic power well that can be enabled/disabled. For
> domains powered by always-on power wells (panel fitter on pipe A and the
> eDP transcoder) we didn't do anything, for all other domains we just
> enabled the single dynamic power well.
>
> Future HW generations will change this, as they add multiple dynamic
> power wells. Support for these will be added later, this patch prepares
> for those by making sure we only enable the required domains.
>
> Note that after this change on HSW we'll enable all power domains even
> if it was the domain for the panel fitter on pipe A or the eDP
> transcoder. This isn't a problem since the power domain framework
> already checks if the domain is on an always-on power well and doesn't
> do anything in this case.
>
> Signed-off-by: Imre Deak <imre.deak@xxxxxxxxx>
> ---
> drivers/gpu/drm/i915/intel_display.c | 46 ++++++++++++++++++++++++++++++++----
> drivers/gpu/drm/i915/intel_drv.h | 1 +
> 2 files changed, 42 insertions(+), 5 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
> index 8e734f2..e2a4f3b 100644
> --- a/drivers/gpu/drm/i915/intel_display.c
> +++ b/drivers/gpu/drm/i915/intel_display.c
> @@ -6561,21 +6561,57 @@ static void hsw_package_c8_gpu_busy(struct drm_i915_private *dev_priv)
> }
> }
>
> +#define for_each_power_domain(domain, mask) \
> + for ((domain) = 0; (domain) < POWER_DOMAIN_NUM; (domain)++) \
> + if ((1 << (domain)) & (mask))
> +
> +static unsigned long get_pipe_power_domains(struct drm_device *dev,
> + enum pipe pipe, bool pfit_enabled)
> +{
> + unsigned long mask;
> + enum transcoder transcoder;
> +
> + transcoder = intel_pipe_to_cpu_transcoder(dev->dev_private, pipe);
> +
> + mask = BIT(POWER_DOMAIN_PIPE(pipe));
> + mask |= BIT(POWER_DOMAIN_TRANSCODER(transcoder));
> + if (pfit_enabled)
> + mask |= BIT(POWER_DOMAIN_PIPE_PANEL_FITTER(pipe));
> +
> + return mask;
> +}
> +
> static void modeset_update_power_wells(struct drm_device *dev)
> {
> - bool enable = false;
> + unsigned long pipe_domains[I915_MAX_PIPES] = { 0, };
> struct intel_crtc *crtc;
>
> + /*
> + * First get all needed power domains, then put all unneeded, to avoid
> + * any unnecessary toggling of the power wells.
> + */
> list_for_each_entry(crtc, &dev->mode_config.crtc_list, base.head) {
> + enum intel_display_power_domain domain;
> +
> if (!crtc->base.enabled)
> continue;
>
> - if (crtc->pipe != PIPE_A || crtc->config.pch_pfit.enabled ||
> - crtc->config.cpu_transcoder != TRANSCODER_EDP)
> - enable = true;
> + pipe_domains[crtc->pipe] = get_pipe_power_domains(dev,
> + crtc->pipe,
> + crtc->config.pch_pfit.enabled);
> +
> + for_each_power_domain(domain, pipe_domains[crtc->pipe])
> + intel_display_power_get(dev, domain);
> }
>
> - intel_set_power_well(dev, enable);
> + list_for_each_entry(crtc, &dev->mode_config.crtc_list, base.head) {
> + enum intel_display_power_domain domain;
> +
> + for_each_power_domain(domain, crtc->enabled_power_domains)
> + intel_display_power_put(dev, domain);
> +
> + crtc->enabled_power_domains = pipe_domains[crtc->pipe];
> + }
> }
>
> static void haswell_modeset_global_resources(struct drm_device *dev)
> diff --git a/drivers/gpu/drm/i915/intel_drv.h b/drivers/gpu/drm/i915/intel_drv.h
> index 189257d..63a5bfd 100644
> --- a/drivers/gpu/drm/i915/intel_drv.h
> +++ b/drivers/gpu/drm/i915/intel_drv.h
> @@ -320,6 +320,7 @@ struct intel_crtc {
> * some outputs connected to this crtc.
> */
> bool active;
> + unsigned long enabled_power_domains;
> bool eld_vld;
> bool primary_enabled; /* is the primary plane (partially) visible? */
> bool lowfreq_avail;
Reviewed-by: Jesse Barnes <jbarnes@xxxxxxxxxxxxxxxx>
Hope we can get rid of the set_power_well() function soon...
--
Jesse Barnes, Intel Open Source Technology Center
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