linux-kernel - Re: [PATCH v2 0/6] [media] pci: use generic power management

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Date:   Fri, 17 Jul 2020 10:26:48 +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>,
        Mauro Carvalho Chehab <mchehab@...nel.org>
Cc:     linux-kernel@...r.kernel.org, linux-media@...r.kernel.org,
        linux-kernel-mentees@...ts.linuxfoundation.org,
        Shuah Khan <skhan@...uxfoundation.org>
Subject: Re: [PATCH v2 0/6] [media] pci: use generic power management

On Fri, Jul 17, 2020 at 09:26:02AM +0530, Vaibhav Gupta wrote:
> Linux Kernel Mentee: Remove Legacy Power Management.
> 
> The purpose of this patch series is to upgrade power management in media
> 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.
> 
> v2: v1 possibly broke cx23885 and cx25821.
v1 didn't break anything in real as patch was not applied. But it could have.
> 
> All patches are compile-tested only.
> 
> Test tools:
>     - Compiler: gcc (GCC) 10.1.0
>     - allmodconfig build: make -j$(nproc) W=1 all
> 
> Vaibhav Gupta (6):
>   sta2x11: use generic power management
>   cx23885: use generic power management
>   cx25821: use generic power management
>   cx88: use generic power management
>   meye: use generic power management
>   tw68: use generic power management
> 
>  drivers/media/pci/cx23885/cx23885-core.c |  3 --
>  drivers/media/pci/cx25821/cx25821-core.c |  3 --
>  drivers/media/pci/cx88/cx88-video.c      | 52 +++++--------------
>  drivers/media/pci/meye/meye.c            | 15 ++----
>  drivers/media/pci/sta2x11/sta2x11_vip.c  | 63 ++++++------------------
>  drivers/media/pci/tw68/tw68-core.c       | 30 +++++------
>  6 files changed, 44 insertions(+), 122 deletions(-)
> 
> -- 
> 2.27.0
>