linux-kernel - Re: [rft, PATCH v3 00/15] drm/i915/dsi: 2nd attempt to get rid of IOSF GPIO

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <87zfzw17up.fsf@intel.com>
Date:   Thu, 02 Nov 2023 17:40:46 +0200
From:   Jani Nikula <jani.nikula@...el.com>
To:     Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        intel-gfx@...ts.freedesktop.org, dri-devel@...ts.freedesktop.org,
        linux-kernel@...r.kernel.org
Cc:     Joonas Lahtinen <joonas.lahtinen@...ux.intel.com>,
        Rodrigo Vivi <rodrigo.vivi@...el.com>,
        Tvrtko Ursulin <tvrtko.ursulin@...ux.intel.com>,
        David Airlie <airlied@...il.com>,
        Daniel Vetter <daniel@...ll.ch>,
        Hans de Goede <hdegoede@...hat.com>
Subject: Re: [rft, PATCH v3 00/15] drm/i915/dsi: 2nd attempt to get rid of
 IOSF GPIO

On Thu, 02 Nov 2023, Andy Shevchenko <andriy.shevchenko@...ux.intel.com> wrote:
> DSI code for VBT has a set of ugly GPIO hacks, one of which is direct
> talking to GPIO IP behind the actual driver's back. A second attempt
> to fix that is here.
>
> If I understood correctly, my approach should work in the similar way as
> the current IOSF GPIO.
>
> Hans, I believe you have some devices that use this piece of code,
> is it possible to give a test run on (one of) them?
>
> In v3:
> - incorporated series by Jani
> - incorporated couple of precursor patches by Hans
> - added Rb tag for used to be first three patches (Andi)
> - rebased on top of the above changes
> - fixed indexing for multi-community devices, such as Cherry View
>
> In v2:
> - added a few cleanup patches
> - reworked to use dynamic GPIO lookup tables
> - converted CHV as well
>
> Andy Shevchenko (8):
>   drm/i915/dsi: Replace while(1) with one with clear exit condition
>   drm/i915/dsi: Get rid of redundant 'else'
>   drm/i915/dsi: Replace check with a (missing) MIPI sequence name
>   drm/i915/dsi: Extract common soc_gpio_set_value() helper
>   drm/i915/dsi: Replace poking of VLV GPIOs behind the driver's back
>   drm/i915/dsi: Prepare soc_gpio_set_value() to distinguish GPIO
>     communities
>   drm/i915/dsi: Replace poking of CHV GPIOs behind the driver's back
>   drm/i915/iosf: Drop unused APIs
>
> Hans de Goede (2):
>   drm/i915/dsi: Remove GPIO lookup table at the end of
>     intel_dsi_vbt_gpio_init()
>   drm/i915/dsi: Fix wrong initial value for GPIOs in bxt_exec_gpio()

Assuming it all still works, and I do trust Hans' testing here quite a
bit, the above is

Acked-by: Jani Nikula <jani.nikula@...el.com>

Thanks for doing this!

>
> Jani Nikula (5):
>   drm/i915/dsi: assume BXT gpio works for non-native GPIO
>   drm/i915/dsi: switch mipi_exec_gpio() from dev_priv to i915
>   drm/i915/dsi: clarify GPIO exec sequence
>   drm/i915/dsi: rename platform specific *_exec_gpio() to
>     *_gpio_set_value()
>   drm/i915/dsi: bxt/icl GPIO set value do not need gpio source
>
>  drivers/gpu/drm/i915/display/intel_dsi_vbt.c | 355 +++++++------------
>  drivers/gpu/drm/i915/vlv_sideband.c          |  17 -
>  drivers/gpu/drm/i915/vlv_sideband.h          |   3 -
>  3 files changed, 137 insertions(+), 238 deletions(-)

-- 
Jani Nikula, Intel