linux-kernel - Re: [PATCH v7 2/3] drm/bridge: ti-sn65dsi86: Use regmap_bulk

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Date:   Wed, 27 Oct 2021 07:06:51 -0700
From:   Bjorn Andersson <bjorn.andersson@...aro.org>
To:     Robert Foss <robert.foss@...aro.org>
Cc:     Thierry Reding <thierry.reding@...il.com>,
        Uwe Kleine-K?nig <u.kleine-koenig@...gutronix.de>,
        Lee Jones <lee.jones@...aro.org>, linux-pwm@...r.kernel.org,
        linux-kernel <linux-kernel@...r.kernel.org>,
        MSM <linux-arm-msm@...r.kernel.org>
Subject: Re: [PATCH v7 2/3] drm/bridge: ti-sn65dsi86: Use regmap_bulk_write
 API

On Wed 27 Oct 01:29 PDT 2021, Robert Foss wrote:

> Hey Bjorn,
> 
> On Mon, 25 Oct 2021 at 19:07, Bjorn Andersson
> <bjorn.andersson@...aro.org> wrote:
> >
> > The multi-register u16 write operation can use regmap_bulk_write()
> > instead of two separate regmap_write() calls.
> >
> > It's uncertain if this has any effect on the actual updates of the
> > underlying registers, but this at least gives the hardware the
> > opportunity and saves us one transation on the bus.
> >
> > Signed-off-by: Bjorn Andersson <bjorn.andersson@...aro.org>
> 
> Did you miss including Dougs R-B from v6? As far as I can tell nothing
> else changed between v6 & v7.
> 

Yes, I missed adding Doug's R-b from v6. I also missed fixing the
spelling of transaction (transation) in the commit message.

Would you be willing to correct these two items as you apply the
patches?

Thanks,
Bjorn

> > ---
> >
> > Changes since v6:
> > - None
> >
> >  drivers/gpu/drm/bridge/ti-sn65dsi86.c | 5 +++--
> >  1 file changed, 3 insertions(+), 2 deletions(-)
> >
> > diff --git a/drivers/gpu/drm/bridge/ti-sn65dsi86.c b/drivers/gpu/drm/bridge/ti-sn65dsi86.c
> > index 6154bed0af5b..5b59d8dd3acd 100644
> > --- a/drivers/gpu/drm/bridge/ti-sn65dsi86.c
> > +++ b/drivers/gpu/drm/bridge/ti-sn65dsi86.c
> > @@ -193,8 +193,9 @@ static const struct regmap_config ti_sn65dsi86_regmap_config = {
> >  static void ti_sn65dsi86_write_u16(struct ti_sn65dsi86 *pdata,
> >                                    unsigned int reg, u16 val)
> >  {
> > -       regmap_write(pdata->regmap, reg, val & 0xFF);
> > -       regmap_write(pdata->regmap, reg + 1, val >> 8);
> > +       u8 buf[2] = { val & 0xff, val >> 8 };
> > +
> > +       regmap_bulk_write(pdata->regmap, reg, buf, ARRAY_SIZE(buf));
> >  }
> >
> >  static u32 ti_sn_bridge_get_dsi_freq(struct ti_sn65dsi86 *pdata)
> > --
> > 2.29.2
> >