linux-kernel - Re: [PATCH v1 0/3] char: use generic power management

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Message-ID: <20200817074921.GE5869@gmail.com>
Date:   Mon, 17 Aug 2020 13:19:21 +0530
From:   Vaibhav Gupta <vaibhavgupta40@...il.com>
To:     Bjorn Helgaas <helgaas@...nel.org>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Bjorn Helgaas <bjorn@...gaas.com>,
        Vaibhav Gupta <vaibhav.varodek@...il.com>,
        David Airlie <airlied@...ux.ie>, Arnd Bergmann <arnd@...db.de>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     linux-kernel@...r.kernel.org,
        linux-kernel-mentees@...ts.linuxfoundation.org,
        Shuah Khan <skhan@...uxfoundation.org>
Subject: Re: [PATCH v1 0/3] char: use generic power management

On Fri, Jul 17, 2020 at 01:19:34PM +0530, Vaibhav Gupta wrote:
> Linux Kernel Mentee: Remove Legacy Power Management.
> 
> The purpose of this patch series is to upgrade power management in char
> drivers. This has been done by upgrading .suspend() and .resume() callbacks.
> 
> The upgrade makes sure that the involvement of PCI Core does not change the
> order of operations executed in a driver. Thus, does not change its behavior.
> 
> In general, drivers with legacy PM, .suspend() and .resume() make use of PCI
> helper functions like pci_enable/disable_device_mem(), pci_set_power_state(),
> pci_save/restore_state(), pci_enable/disable_device(), etc. to complete
> their job.
> 
> The conversion requires the removal of those function calls, change the
> callbacks' definition accordingly and make use of dev_pm_ops structure.
> 
> All patches are compile-tested only.
> 
> Test tools:
>     - Compiler: gcc (GCC) 10.1.0
>     - allmodconfig build: make -j$(nproc) W=1 all
> 
> Vaibhav Gupta (3):
>   amd64-agp: use generic power management
>   sis-agp: use generic power management
>   via-agp: use generic power management
> 
>  drivers/char/agp/amd64-agp.c | 24 ++++++------------------
>  drivers/char/agp/sis-agp.c   | 25 ++++++-------------------
>  drivers/char/agp/via-agp.c   | 25 +++++--------------------
>  3 files changed, 17 insertions(+), 57 deletions(-)
> 
> -- 
> 2.27.0
>