On Tue, Mar 11, 2025 at 09:07:10AM +0100, Maxime Ripard wrote:
> On Mon, Mar 10, 2025 at 10:18:04PM +0200, Dmitry Baryshkov wrote:
> > On Mon, Mar 10, 2025 at 03:51:53PM +0100, Maxime Ripard wrote:
> > > On Sun, Mar 09, 2025 at 10:13:58AM +0200, Dmitry Baryshkov wrote:
> > > > From: Dmitry Baryshkov <dmitry.baryshkov@xxxxxxxxxx>
> > > >
> > > > Use drm_hdmi_acr_get_n_cts() helper instead of calculating N and CTS
> > > > values in the VC4 driver.
> > > >
> > > > Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@xxxxxxxxxx>
> > > > ---
> > > > drivers/gpu/drm/vc4/vc4_hdmi.c | 10 +++-------
> > > > drivers/gpu/drm/vc4/vc4_hdmi.h | 7 +++++++
> > > > 2 files changed, 10 insertions(+), 7 deletions(-)
> > > >
> >
> > > > diff --git a/drivers/gpu/drm/vc4/vc4_hdmi.h b/drivers/gpu/drm/vc4/vc4_hdmi.h
> > > > index e3d989ca302b72533c374dfa3fd0d5bd7fe64a82..0a775dbfe99d45521f3d0a2016555aefa81d7934 100644
> > > > --- a/drivers/gpu/drm/vc4/vc4_hdmi.h
> > > > +++ b/drivers/gpu/drm/vc4/vc4_hdmi.h
> > > > @@ -211,6 +211,13 @@ struct vc4_hdmi {
> > > > * KMS hooks. Protected by @mutex.
> > > > */
> > > > enum hdmi_colorspace output_format;
> > > > +
> > > > + /**
> > > > + * @tmds_char_rate: Copy of
> > > > + * @drm_connector_state.hdmi.tmds_char_rate for use outside of
> > > > + * KMS hooks. Protected by @mutex.
> > > > + */
> > > > + unsigned long long tmds_char_rate;
> > > > };
> > >
> > > This should be in drm_connector_hdmi if it's useful
> >
> > That would mean bringing the state to a non-state structure on the
> > framework level. Is it fine from your POV?
>
> Sorry, I'm changing my mind a little bit, but it's pretty much the same
> case than for accessing the infoframes from debugfs: we want to get some
> information stored in the state from outside of KMS.
>
> What we did for the infoframes is that we're actually just taking the
> connection_mutex from the DRM device and access the drm_connector->state
> pointer.
>
> I guess it would also work for ALSA?
I'd really prefer to follow the drm_connector.infoframes.audio. It makes
sense to group all ALSA-related functionality together. Maybe I should
refactor it to:
struct drm_connector {
struct {
struct mutex lock;
struct drm_connector_hdmi_infoframe audio_infoframe;
unsigned long long tmds_char_rate;
} audio;
};
WDYT? If that doesn't sound appealing, I'll go the connetion_mutex and
drm_connector_state way.
--
With best wishes
Dmitry
