[v4,0/2] Fix Goodix touchscreen power leakage for MT8186 boards

  These changes are based on the series in [1], which modified the
i2c-hid-of-goodix driver and removed the workaround for a power leakage
issue, so the issue revisits on Mediatek MT8186 boards (Steelix).

The root cause is that the touchscreen can be powered in different ways
depending on the hardware designs, and it's not as easy to come up with
a solution that is both simple and elegant for all the known designs.

To address the issue, I ended up adding a new boolean property for the
driver so that we can control the power up/down sequence depending on
that.

Adding a new property might not be the cleanest approach for this, but
at least the intention would be easy enough to understand, and it
introduces relatively small change to the code and fully preserves the
original control flow.
I hope this is something acceptable, and I'm open to any better
approaches.

[1] https://lore.kernel.org/all/20230207024816.525938-1-dianders@chromium.org/

Changes in v4:
- Minor coding style improvement

Changes in v3:
- In power-down, only skip the GPIO but not the regulator calls if the
  flag is set

Changes in v2:
- Use a more accurate property name and with "goodix," prefix.
- Do not change the regulator_enable logic during power-up.

Fei Shao (2):
  dt-bindings: input: goodix: Add "goodix,no-reset-during-suspend"
    property
  HID: i2c-hid: goodix: Add support for "goodix,no-reset-during-suspend"
    property

 .../bindings/input/goodix,gt7375p.yaml           |  9 +++++++++
 drivers/hid/i2c-hid/i2c-hid-of-goodix.c          | 16 +++++++++++++++-
 2 files changed, 24 insertions(+), 1 deletion(-)
  

Hi,

On Wed, Apr 26, 2023 at 8:57 PM Fei Shao <fshao@chromium.org> wrote:
>
> These changes are based on the series in [1], which modified the
> i2c-hid-of-goodix driver and removed the workaround for a power leakage
> issue, so the issue revisits on Mediatek MT8186 boards (Steelix).
>
> The root cause is that the touchscreen can be powered in different ways
> depending on the hardware designs, and it's not as easy to come up with
> a solution that is both simple and elegant for all the known designs.
>
> To address the issue, I ended up adding a new boolean property for the
> driver so that we can control the power up/down sequence depending on
> that.
>
> Adding a new property might not be the cleanest approach for this, but
> at least the intention would be easy enough to understand, and it
> introduces relatively small change to the code and fully preserves the
> original control flow.
> I hope this is something acceptable, and I'm open to any better
> approaches.
>
> [1] https://lore.kernel.org/all/20230207024816.525938-1-dianders@chromium.org/
>
> Changes in v4:
> - Minor coding style improvement
>
> Changes in v3:
> - In power-down, only skip the GPIO but not the regulator calls if the
>   flag is set
>
> Changes in v2:
> - Use a more accurate property name and with "goodix," prefix.
> - Do not change the regulator_enable logic during power-up.
>
> Fei Shao (2):
>   dt-bindings: input: goodix: Add "goodix,no-reset-during-suspend"
>     property
>   HID: i2c-hid: goodix: Add support for "goodix,no-reset-during-suspend"
>     property
>
>  .../bindings/input/goodix,gt7375p.yaml           |  9 +++++++++
>  drivers/hid/i2c-hid/i2c-hid-of-goodix.c          | 16 +++++++++++++++-
>  2 files changed, 24 insertions(+), 1 deletion(-)

Just double-checking if there is any work needed on this series. I
think it's ready to land but I wanted to double-check.

Thanks!

-Doug
  

On Fri, 19 May 2023, Doug Anderson wrote:

> > These changes are based on the series in [1], which modified the
> > i2c-hid-of-goodix driver and removed the workaround for a power leakage
> > issue, so the issue revisits on Mediatek MT8186 boards (Steelix).
> >
> > The root cause is that the touchscreen can be powered in different ways
> > depending on the hardware designs, and it's not as easy to come up with
> > a solution that is both simple and elegant for all the known designs.
> >
> > To address the issue, I ended up adding a new boolean property for the
> > driver so that we can control the power up/down sequence depending on
> > that.
> >
> > Adding a new property might not be the cleanest approach for this, but
> > at least the intention would be easy enough to understand, and it
> > introduces relatively small change to the code and fully preserves the
> > original control flow.
> > I hope this is something acceptable, and I'm open to any better
> > approaches.
> >
> > [1] https://lore.kernel.org/all/20230207024816.525938-1-dianders@chromium.org/
> >
> > Changes in v4:
> > - Minor coding style improvement
> >
> > Changes in v3:
> > - In power-down, only skip the GPIO but not the regulator calls if the
> >   flag is set
> >
> > Changes in v2:
> > - Use a more accurate property name and with "goodix," prefix.
> > - Do not change the regulator_enable logic during power-up.
> >
> > Fei Shao (2):
> >   dt-bindings: input: goodix: Add "goodix,no-reset-during-suspend"
> >     property
> >   HID: i2c-hid: goodix: Add support for "goodix,no-reset-during-suspend"
> >     property
> >
> >  .../bindings/input/goodix,gt7375p.yaml           |  9 +++++++++
> >  drivers/hid/i2c-hid/i2c-hid-of-goodix.c          | 16 +++++++++++++++-
> >  2 files changed, 24 insertions(+), 1 deletion(-)
> 
> Just double-checking if there is any work needed on this series. I
> think it's ready to land but I wanted to double-check.

I don't think I've been CCed on the dt-binding part (patch 1/2 I guess). 
Has it been Acked? If so, I will happily take it through hid.git, but 
please send it my way.

Thanks,
  

Hi,

On Tue, May 23, 2023 at 6:11 AM Jiri Kosina <jikos@kernel.org> wrote:
>
> On Fri, 19 May 2023, Doug Anderson wrote:
>
> > > These changes are based on the series in [1], which modified the
> > > i2c-hid-of-goodix driver and removed the workaround for a power leakage
> > > issue, so the issue revisits on Mediatek MT8186 boards (Steelix).
> > >
> > > The root cause is that the touchscreen can be powered in different ways
> > > depending on the hardware designs, and it's not as easy to come up with
> > > a solution that is both simple and elegant for all the known designs.
> > >
> > > To address the issue, I ended up adding a new boolean property for the
> > > driver so that we can control the power up/down sequence depending on
> > > that.
> > >
> > > Adding a new property might not be the cleanest approach for this, but
> > > at least the intention would be easy enough to understand, and it
> > > introduces relatively small change to the code and fully preserves the
> > > original control flow.
> > > I hope this is something acceptable, and I'm open to any better
> > > approaches.
> > >
> > > [1] https://lore.kernel.org/all/20230207024816.525938-1-dianders@chromium.org/
> > >
> > > Changes in v4:
> > > - Minor coding style improvement
> > >
> > > Changes in v3:
> > > - In power-down, only skip the GPIO but not the regulator calls if the
> > >   flag is set
> > >
> > > Changes in v2:
> > > - Use a more accurate property name and with "goodix," prefix.
> > > - Do not change the regulator_enable logic during power-up.
> > >
> > > Fei Shao (2):
> > >   dt-bindings: input: goodix: Add "goodix,no-reset-during-suspend"
> > >     property
> > >   HID: i2c-hid: goodix: Add support for "goodix,no-reset-during-suspend"
> > >     property
> > >
> > >  .../bindings/input/goodix,gt7375p.yaml           |  9 +++++++++
> > >  drivers/hid/i2c-hid/i2c-hid-of-goodix.c          | 16 +++++++++++++++-
> > >  2 files changed, 24 insertions(+), 1 deletion(-)
> >
> > Just double-checking if there is any work needed on this series. I
> > think it's ready to land but I wanted to double-check.
>
> I don't think I've been CCed on the dt-binding part (patch 1/2 I guess).
> Has it been Acked? If so, I will happily take it through hid.git, but
> please send it my way.

Yeah, Rob Acked it:

https://lore.kernel.org/r/168261692866.3205353.5077242811275926416.robh@kernel.org/

Fei: can you repost the series with collected tags and make sure to CC Jiri?

Thanks!

-Doug
  

On Tue, May 23, 2023 at 9:32 PM Doug Anderson <dianders@chromium.org> wrote:
>
> Hi,
>
> On Tue, May 23, 2023 at 6:11 AM Jiri Kosina <jikos@kernel.org> wrote:
> >
> > On Fri, 19 May 2023, Doug Anderson wrote:
> >
> > > > These changes are based on the series in [1], which modified the
> > > > i2c-hid-of-goodix driver and removed the workaround for a power leakage
> > > > issue, so the issue revisits on Mediatek MT8186 boards (Steelix).
> > > >
> > > > The root cause is that the touchscreen can be powered in different ways
> > > > depending on the hardware designs, and it's not as easy to come up with
> > > > a solution that is both simple and elegant for all the known designs.
> > > >
> > > > To address the issue, I ended up adding a new boolean property for the
> > > > driver so that we can control the power up/down sequence depending on
> > > > that.
> > > >
> > > > Adding a new property might not be the cleanest approach for this, but
> > > > at least the intention would be easy enough to understand, and it
> > > > introduces relatively small change to the code and fully preserves the
> > > > original control flow.
> > > > I hope this is something acceptable, and I'm open to any better
> > > > approaches.
> > > >
> > > > [1] https://lore.kernel.org/all/20230207024816.525938-1-dianders@chromium.org/
> > > >
> > > > Changes in v4:
> > > > - Minor coding style improvement
> > > >
> > > > Changes in v3:
> > > > - In power-down, only skip the GPIO but not the regulator calls if the
> > > >   flag is set
> > > >
> > > > Changes in v2:
> > > > - Use a more accurate property name and with "goodix," prefix.
> > > > - Do not change the regulator_enable logic during power-up.
> > > >
> > > > Fei Shao (2):
> > > >   dt-bindings: input: goodix: Add "goodix,no-reset-during-suspend"
> > > >     property
> > > >   HID: i2c-hid: goodix: Add support for "goodix,no-reset-during-suspend"
> > > >     property
> > > >
> > > >  .../bindings/input/goodix,gt7375p.yaml           |  9 +++++++++
> > > >  drivers/hid/i2c-hid/i2c-hid-of-goodix.c          | 16 +++++++++++++++-
> > > >  2 files changed, 24 insertions(+), 1 deletion(-)
> > >
> > > Just double-checking if there is any work needed on this series. I
> > > think it's ready to land but I wanted to double-check.
> >
> > I don't think I've been CCed on the dt-binding part (patch 1/2 I guess).
> > Has it been Acked? If so, I will happily take it through hid.git, but
> > please send it my way.
>
> Yeah, Rob Acked it:
>
> https://lore.kernel.org/r/168261692866.3205353.5077242811275926416.robh@kernel.org/
>
> Fei: can you repost the series with collected tags and make sure to CC Jiri?

Sure, I'll do that tomorrow  :)

Regards,
Fei

>
> Thanks!
>
> -Doug