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

Vaibhav Gupta vaibhavgupta40 at gmail.com
Fri Jul 17 03:56:02 UTC 2020

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.

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(-)


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