On Thu, Aug 06, 2020 at 12:52:54PM +0530, Vaibhav Gupta wrote:

Linux Kernel Mentee: Remove Legacy Power Management. 

The original goal of the patch series is to upgrade the power management
framework of radeonfb fbdev driver. 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.

During this process, it was found that "#if defined(CONFIG_PM)" at line 1434 is
redundant. This was introduced in the commit
42ddb453a0cd ("radeon: Conditionally compile PM code").

I do wonder whether it wouldn't be better to just outright delete these,
we have the drm radeon driver for pretty much all the same hardware ...
-Daniel

------------

Before 42ddb453a0cd:
$ git show 65122f7e80b5:drivers/video/aty/radeon_pm.c | grep -n "#ifdef\|#if\|#else\|#endif\|#elif\|#ifndef"

Based on output in terminal:

547:#ifdef CONFIG_PM
       |-- 959:#ifdef CONFIG_PPC_PMAC
       |-- 972:#endif
       |-- 1291:#ifdef CONFIG_PPC_OF
       |-- 1301:#endif /* CONFIG_PPC_OF */
       |-- 1943:#ifdef CONFIG_PPC_OF
                   |-- 2206:#if 0 /* Not ready yet */
                   |-- 2508:#endif /* 0 */
       |-- 2510:#endif /* CONFIG_PPC_OF */
       |-- 2648:#ifdef CONFIG_PPC_PMAC
       |-- 2654:#endif /* CONFIG_PPC_PMAC */
       |-- 2768:#ifdef CONFIG_PPC_PMAC
       |-- 2774:#endif /* CONFIG_PPC_PMAC */
       |-- 2791:#ifdef CONFIG_PPC_OF__disabled
       |-- 2801:#endif /* CONFIG_PPC_OF */
2803:#endif /* CONFIG_PM */

------------

After 42ddb453a0cd:
$ git show 42ddb453a0cd:drivers/video/aty/radeon_pm.c | grep -n "#ifdef\|#if\|#else\|#endif\|#elif\|#ifndef"

Based on output in terminal:

547:#ifdef CONFIG_PM
       |-- 959:#ifdef CONFIG_PPC_PMAC
       |-- 972:#endif
       |-- 1291:#ifdef CONFIG_PPC_OF
       |-- 1301:#endif /* CONFIG_PPC_OF */
       |-- 1430:#if defined(CONFIG_PM)
                   |-- 1431:#if defined(CONFIG_X86) || defined(CONFIG_PPC_PMAC)
                   |-- 1944:#endif
                   |-- 1946:#ifdef CONFIG_PPC_OF
                               |-- 1947:#ifdef CONFIG_PPC_PMAC
                               |-- 2208:#endif
                   |-- 2209:#endif
                   |-- 2211:#if 0 /* Not ready yet */
                   |-- 2513:#endif /* 0 */
       |-- 2515:#endif /* CONFIG_PPC_OF */
       |-- 2653:#ifdef CONFIG_PPC_PMAC
       |-- 2659:#endif /* CONFIG_PPC_PMAC */
       |-- 2773:#ifdef CONFIG_PPC_PMAC
       |-- 2779:#endif /* CONFIG_PPC_PMAC */
       |-- 2796:#ifdef CONFIG_PPC_OF__disabled
       |-- 2806:#endif /* CONFIG_PPC_OF */
2808:#endif /* CONFIG_PM */

------------

This also affected the CONFIG_PPC_OF container (line 1943 at commit 65122f7e80b5)

The patch-series fixes it along with PM upgrade.

All patches are compile-tested only.

Test tools:
    - Compiler: gcc (GCC) 10.1.0
    - allmodconfig build: make -j$(nproc) W=1 all

Vaibhav Gupta (2):
  video: fbdev: aty: radeon_pm: remove redundant CONFIG_PM container
  fbdev: radeonfb:use generic power management

 drivers/video/fbdev/aty/radeon_base.c | 10 ++++---
 drivers/video/fbdev/aty/radeon_pm.c   | 38 ++++++++++++++++++++-------
 drivers/video/fbdev/aty/radeonfb.h    |  3 +--
 3 files changed, 35 insertions(+), 16 deletions(-)

-- 
2.27.0

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-- 
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch
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