Quoting Doug Anderson (2020-05-05 11:45:05)
> On Mon, May 4, 2020 at 10:44 PM Stephen Boyd <swboyd@xxxxxxxxxxxx> wrote:
> >
> > Quoting Douglas Anderson (2020-05-04 21:36:31)
> > > regmap_update_bits(pdata->regmap, SN_DSI_LANES_REG,
> > > CHA_DSI_LANES_MASK, val);
> > >
> > > + regmap_write(pdata->regmap, SN_LN_ASSIGN_REG, pdata->ln_assign);
> > > + regmap_update_bits(pdata->regmap, SN_ENH_FRAME_REG, LN_POLRS_MASK,
> > > + pdata->ln_polrs << LN_POLRS_OFFSET);
> > > +
> > > /* set dsi clk frequency value */
> > > ti_sn_bridge_set_dsi_rate(pdata);
> > >
> > > @@ -1063,6 +1066,50 @@ static int ti_sn_setup_gpio_controller(struct ti_sn_bridge *pdata)
> > > return ret;
> > > }
> > >
> > > +static void ti_sn_bridge_parse_lanes(struct ti_sn_bridge *pdata,
> > > + struct device_node *np)
> > > +{
> > > + u32 lane_assignments[SN_MAX_DP_LANES] = { 0, 1, 2, 3 };
> > > + u32 lane_polarities[SN_MAX_DP_LANES] = { };
> > > + struct device_node *endpoint;
> > > + u8 ln_assign = 0;
> > > + u8 ln_polrs = 0;
> >
> > Do we need to assign to 0 to start? Seems like no?
>
> Yes. See usage:
>
> ln_assign = ln_assign << LN_ASSIGN_WIDTH | lane_assignments[i];
> ln_polrs = ln_polrs << 1 | lane_polarities[i];
>
> Notably each time we shift a new bit in we base on the old value. If
> you think it'll make it clearer, I can put this initialization at the
> beginning of the loop. It's 2 extra lines of code but if it adds
> clarity I'll do it.
No it doesn't really make it any clearer.
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