Re: [PATCH 1/3] adv748x: afe: Select input port when device is reset

["Niklas Söderlund" <niklas.soderlund+renesas@ragnatech.se>]

Hi Kieran,

On 2020-11-25 12:10:08 +0000, Kieran Bingham wrote:
> Hi Niklas,
> 
> On 22/11/2020 16:36, Niklas Söderlund wrote:
> > It's not enough to select the AFE input port during probe it also needs
> > to be set when the device is reset. Move the port selection to
> > adv748x_reset() that is called during probe and when the device needs to
> > be reset.
> > 
> 
> Should we instead have an adv748x_afe_reset(), rather than expose the
> AFE internals to the top level core?

We could, I have no real preference. But in this case all 
adv748x_afe_reset() would do is call adv748x_afe_s_input() so unless we 
foresee more work to be done at reset time my preference would be like 
this but it's your call.

> 
> That said, shouldn't we be able to take advantage of regmap to restore
> registers in this instance?

I'm no regmap expert so I don't know. But if so we need to be sure the 
order of registers match what is needed as we need to restore the i2c 
addresses for all none core "pages".

> 
> --
> Kieran
> 
> 
> > Signed-off-by: Niklas Söderlund <niklas.soderlund+renesas@ragnatech.se>
> > ---
> >  drivers/media/i2c/adv748x/adv748x-afe.c  | 6 +-----
> >  drivers/media/i2c/adv748x/adv748x-core.c | 4 ++++
> >  drivers/media/i2c/adv748x/adv748x.h      | 1 +
> >  3 files changed, 6 insertions(+), 5 deletions(-)
> > 
> > diff --git a/drivers/media/i2c/adv748x/adv748x-afe.c b/drivers/media/i2c/adv748x/adv748x-afe.c
> > index dbbb1e4d63637a33..4052cf67bf16c7fb 100644
> > --- a/drivers/media/i2c/adv748x/adv748x-afe.c
> > +++ b/drivers/media/i2c/adv748x/adv748x-afe.c
> > @@ -154,7 +154,7 @@ static void adv748x_afe_set_video_standard(struct adv748x_state *state,
> >  		   (sdpstd & 0xf) << ADV748X_SDP_VID_SEL_SHIFT);
> >  }
> >  
> > -static int adv748x_afe_s_input(struct adv748x_afe *afe, unsigned int input)
> > +int adv748x_afe_s_input(struct adv748x_afe *afe, unsigned int input)
> >  {
> >  	struct adv748x_state *state = adv748x_afe_to_state(afe);
> >  
> > @@ -520,10 +520,6 @@ int adv748x_afe_init(struct adv748x_afe *afe)
> >  		}
> >  	}
> >  
> > -	adv748x_afe_s_input(afe, afe->input);
> > -
> > -	adv_dbg(state, "AFE Default input set to %d\n", afe->input);
> > -
> >  	/* Entity pads and sinks are 0-indexed to match the pads */
> >  	for (i = ADV748X_AFE_SINK_AIN0; i <= ADV748X_AFE_SINK_AIN7; i++)
> >  		afe->pads[i].flags = MEDIA_PAD_FL_SINK;
> > diff --git a/drivers/media/i2c/adv748x/adv748x-core.c b/drivers/media/i2c/adv748x/adv748x-core.c
> > index 00966fe104881a14..8676ad2428856dd3 100644
> > --- a/drivers/media/i2c/adv748x/adv748x-core.c
> > +++ b/drivers/media/i2c/adv748x/adv748x-core.c
> > @@ -516,6 +516,10 @@ static int adv748x_reset(struct adv748x_state *state)
> >  	if (ret)
> >  		return ret;
> >  
> > +	adv748x_afe_s_input(&state->afe, state->afe.input);
> > +
> > +	adv_dbg(state, "AFE Default input set to %d\n", state->afe.input);
> > +
> >  	/* Reset TXA and TXB */
> >  	adv748x_tx_power(&state->txa, 1);
> >  	adv748x_tx_power(&state->txa, 0);
> > diff --git a/drivers/media/i2c/adv748x/adv748x.h b/drivers/media/i2c/adv748x/adv748x.h
> > index 1061f425ece5989e..747947ea3e316451 100644
> > --- a/drivers/media/i2c/adv748x/adv748x.h
> > +++ b/drivers/media/i2c/adv748x/adv748x.h
> > @@ -435,6 +435,7 @@ int adv748x_tx_power(struct adv748x_csi2 *tx, bool on);
> >  
> >  int adv748x_afe_init(struct adv748x_afe *afe);
> >  void adv748x_afe_cleanup(struct adv748x_afe *afe);
> > +int adv748x_afe_s_input(struct adv748x_afe *afe, unsigned int input);
> >  
> >  int adv748x_csi2_init(struct adv748x_state *state, struct adv748x_csi2 *tx);
> >  void adv748x_csi2_cleanup(struct adv748x_csi2 *tx);
> > 
> 

-- 
Regards,
Niklas Söderlund