linux-kernel.vger.kernel.org archive mirror
 help / color / mirror / Atom feed
From: Lee Jones <lee.jones@linaro.org>
To: Hans de Goede <hdegoede@redhat.com>
Cc: "Maarten Lankhorst" <maarten.lankhorst@linux.intel.com>,
	"Jani Nikula" <jani.nikula@linux.intel.com>,
	"Joonas Lahtinen" <joonas.lahtinen@linux.intel.com>,
	"Rodrigo Vivi" <rodrigo.vivi@intel.com>,
	"Ville Syrjälä" <ville.syrjala@linux.intel.com>,
	"Rafael J . Wysocki" <rjw@rjwysocki.net>,
	"Len Brown" <lenb@kernel.org>,
	"Andy Shevchenko" <andriy.shevchenko@linux.intel.com>,
	linux-acpi@vger.kernel.org,
	intel-gfx <intel-gfx@lists.freedesktop.org>,
	dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH 2/3] mfd: intel_soc_pmic: Rename pwm_backlight pwm-lookup to pwm_pmic_backlight
Date: Thu, 12 Dec 2019 08:45:46 +0000	[thread overview]
Message-ID: <20191212084546.GA3468@dell> (raw)
In-Reply-To: <a05e5a2b-568e-2b0d-0293-aa937c590a74@redhat.com>

On Wed, 11 Dec 2019, Hans de Goede wrote:

> Hi Lee,
> 
> On 10-12-2019 09:51, Lee Jones wrote:
> > On Tue, 19 Nov 2019, Hans de Goede wrote:
> > 
> > > At least Bay Trail (BYT) and Cherry Trail (CHT) devices can use 1 of 2
> > > different PWM controllers for controlling the LCD's backlight brightness.
> > > 
> > > Either the one integrated into the PMIC or the one integrated into the
> > > SoC (the 1st LPSS PWM controller).
> > > 
> > > So far in the LPSS code on BYT we have skipped registering the LPSS PWM
> > > controller "pwm_backlight" lookup entry when a Crystal Cove PMIC is
> > > present, assuming that in this case the PMIC PWM controller will be used.
> > > 
> > > On CHT we have been relying on only 1 of the 2 PWM controllers being
> > > enabled in the DSDT at the same time; and always registered the lookup.
> > > 
> > > So far this has been working, but the correct way to determine which PWM
> > > controller needs to be used is by checking a bit in the VBT table and
> > > recently I've learned about 2 different BYT devices:
> > > Point of View MOBII TAB-P800W
> > > Acer Switch 10 SW5-012
> > > 
> > > Which use a Crystal Cove PMIC, yet the LCD is connected to the SoC/LPSS
> > > PWM controller (and the VBT correctly indicates this), so here our old
> > > heuristics fail.
> > > 
> > > Since only the i915 driver has access to the VBT, this commit renames
> > > the "pwm_backlight" lookup entries for the Crystal Cove PMIC's PWM
> > > controller to "pwm_pmic_backlight" so that the i915 driver can do a
> > > pwm_get() for the right controller depending on the VBT bit, instead of
> > > the i915 driver relying on a "pwm_backlight" lookup getting registered
> > > which magically points to the right controller.
> > > 
> > > Signed-off-by: Hans de Goede <hdegoede@redhat.com>
> > > ---
> > >   drivers/mfd/intel_soc_pmic_core.c | 2 +-
> > >   1 file changed, 1 insertion(+), 1 deletion(-)
> > 
> > For my own reference:
> >    Acked-for-MFD-by: Lee Jones <lee.jones@linaro.org>
> 
> As mentioned in the cover-letter, to avoid breaking bi-sectability
> as well as to avoid breaking the intel-gfx CI we need to merge this series
> in one go through one tree. Specifically through the drm-intel tree.
> Is that ok with you ?
> 
> If this is ok with you, then you do not have to do anything, I will just push
> the entire series to drm-intel. drivers/mfd/intel_soc_pmic_core.c
> does not see much changes so I do not expect this to lead to any conflicts.

It's fine, so long as a minimal immutable pull-request is provided.
Whether it's pulled or not will depend on a number of factors, but it
needs to be an option.

-- 
Lee Jones [李琼斯]
Linaro Services Technical Lead
Linaro.org │ Open source software for ARM SoCs
Follow Linaro: Facebook | Twitter | Blog

  reply	other threads:[~2019-12-12  8:46 UTC|newest]

Thread overview: 24+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-11-19 15:18 [PATCH 0/3] drm/i915 / LPSS / mfd: Select correct PWM controller to use based on VBT Hans de Goede
2019-11-19 15:18 ` [PATCH 1/3] ACPI / LPSS: Rename pwm_backlight pwm-lookup to pwm_soc_backlight Hans de Goede
2019-11-29 11:59   ` Rafael J. Wysocki
2019-11-19 15:18 ` [PATCH 2/3] mfd: intel_soc_pmic: Rename pwm_backlight pwm-lookup to pwm_pmic_backlight Hans de Goede
2019-12-10  8:51   ` Lee Jones
2019-12-11 17:29     ` Hans de Goede
2019-12-12  8:45       ` Lee Jones [this message]
2019-12-12 14:34         ` Hans de Goede
2019-12-12 15:52           ` Lee Jones
2019-12-12 19:02             ` Hans de Goede
2019-12-13  8:27               ` Lee Jones
2019-12-13 12:40                 ` Hans de Goede
2019-12-16  9:30                   ` Lee Jones
2019-12-16 10:04                     ` Hans de Goede
2019-12-17  8:11                       ` Lee Jones
2019-12-17 13:25                         ` Jani Nikula
2019-12-17 13:51                           ` Lee Jones
2019-12-18  7:14                             ` Jani Nikula
2019-12-18  9:38                               ` Lee Jones
2019-11-19 15:18 ` [PATCH 3/3] drm/i915: DSI: select correct PWM controller to use based on the VBT Hans de Goede
2019-11-19 15:47   ` Ville Syrjälä
2019-11-19 16:48     ` Hans de Goede
2019-11-19 15:43 ` [PATCH 0/3] drm/i915 / LPSS / mfd: Select correct PWM controller to use based on VBT Jani Nikula
2019-11-19 16:32 ` Andy Shevchenko

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=20191212084546.GA3468@dell \
    --to=lee.jones@linaro.org \
    --cc=andriy.shevchenko@linux.intel.com \
    --cc=dri-devel@lists.freedesktop.org \
    --cc=hdegoede@redhat.com \
    --cc=intel-gfx@lists.freedesktop.org \
    --cc=jani.nikula@linux.intel.com \
    --cc=joonas.lahtinen@linux.intel.com \
    --cc=lenb@kernel.org \
    --cc=linux-acpi@vger.kernel.org \
    --cc=linux-kernel@vger.kernel.org \
    --cc=maarten.lankhorst@linux.intel.com \
    --cc=rjw@rjwysocki.net \
    --cc=rodrigo.vivi@intel.com \
    --cc=ville.syrjala@linux.intel.com \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).