linux-kernel - Re: [PATCH v2] drm/bridge: it6505: Add i2c api power on check

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Date:   Thu, 21 Jul 2022 11:21:13 +0800
From:   Pin-yen Lin <treapking@...omium.org>
To:     Robert Foss <robert.foss@...aro.org>
Cc:     allen <allen.chen@....com.tw>,
        Jau-Chih Tseng <Jau-Chih.Tseng@....com.tw>,
        Kenneth Hung <Kenneth.Hung@....com.tw>,
        Hermes Wu <Hermes.Wu@....com.tw>,
        Pin-yen Lin <treapking@...gle.com>,
        Andrzej Hajda <andrzej.hajda@...el.com>,
        Neil Armstrong <narmstrong@...libre.com>,
        Laurent Pinchart <Laurent.pinchart@...asonboard.com>,
        Jonas Karlman <jonas@...boo.se>,
        Jernej Skrabec <jernej.skrabec@...il.com>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        "open list:DRM DRIVERS" <dri-devel@...ts.freedesktop.org>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2] drm/bridge: it6505: Add i2c api power on check

Hi Robert,

The same patch has been reviewed and applied as
86088f88a25c76baac304b6f887e5da2c30c4e07 in "drm/bridge: it6505: Fixes
bugs" series.

We accidentally sent this out as an individual patch and forgot to
revoke this after sending out the complete series.

Sorry about that.

Regards,
Pin-yen

On Tue, Jul 19, 2022 at 11:26 PM Robert Foss <robert.foss@...aro.org> wrote:
>
> On Wed, 13 Jul 2022 at 05:16, allen <allen.chen@....com.tw> wrote:
> >
> > From: allen chen <allen.chen@....com.tw>
> >
> > Use i2c bus to read/write when it6505 power off will occur i2c error.
> > Add this check will prevent i2c error when it6505 power off.
> >
> > Signed-off-by: Pin-Yen Lin <treapking@...omium.org>
> > Signed-off-by: Allen Chen <allen.chen@....com.tw>
> > Reviewed-by: Robert Foss <robert.foss@...aro.org>
> > ---
> >  drivers/gpu/drm/bridge/ite-it6505.c | 12 ++++++++++--
> >  1 file changed, 10 insertions(+), 2 deletions(-)
> >
> > diff --git a/drivers/gpu/drm/bridge/ite-it6505.c b/drivers/gpu/drm/bridge/ite-it6505.c
> > index aa5e0aa1af85..cfd2c3275dc5 100644
> > --- a/drivers/gpu/drm/bridge/ite-it6505.c
> > +++ b/drivers/gpu/drm/bridge/ite-it6505.c
> > @@ -518,6 +518,9 @@ static int it6505_read(struct it6505 *it6505, unsigned int reg_addr)
> >         int err;
> >         struct device *dev = &it6505->client->dev;
> >
> > +       if (!it6505->powered)
> > +               return -ENODEV;
> > +
> >         err = regmap_read(it6505->regmap, reg_addr, &value);
> >         if (err < 0) {
> >                 dev_err(dev, "read failed reg[0x%x] err: %d", reg_addr, err);
> > @@ -533,6 +536,9 @@ static int it6505_write(struct it6505 *it6505, unsigned int reg_addr,
> >         int err;
> >         struct device *dev = &it6505->client->dev;
> >
> > +       if (!it6505->powered)
> > +               return -ENODEV;
> > +
> >         err = regmap_write(it6505->regmap, reg_addr, reg_val);
> >
> >         if (err < 0) {
> > @@ -550,6 +556,9 @@ static int it6505_set_bits(struct it6505 *it6505, unsigned int reg,
> >         int err;
> >         struct device *dev = &it6505->client->dev;
> >
> > +       if (!it6505->powered)
> > +               return -ENODEV;
> > +
> >         err = regmap_update_bits(it6505->regmap, reg, mask, value);
> >         if (err < 0) {
> >                 dev_err(dev, "write reg[0x%x] = 0x%x mask = 0x%x failed err %d",
> > @@ -2553,13 +2562,12 @@ static int it6505_poweron(struct it6505 *it6505)
> >                 usleep_range(10000, 20000);
> >         }
> >
> > +       it6505->powered = true;
> >         it6505_reset_logic(it6505);
> >         it6505_int_mask_enable(it6505);
> >         it6505_init(it6505);
> >         it6505_lane_off(it6505);
> >
> > -       it6505->powered = true;
> > -
> >         return 0;
> >  }
> >
> > --
> > 2.25.1
> >
>
> This patch no longer applies to the drm-misc-next tree, could you
> rebase it and send out a v3?