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[0/3] mwifiex: disable ps_mode by default for stability

Message ID 20201028142433.18501-1-kitakar@gmail.com
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Series mwifiex: disable ps_mode by default for stability | expand

Message

Tsuchiya Yuto Oct. 28, 2020, 2:24 p.m. UTC 
Hello all,

On Microsoft Surface devices (PCIe-88W8897), we are observing stability
issues when ps_mode (IEEE power_save) is enabled, then eventually causes
firmware crash. Especially on 5GHz APs, the connection is completely
unstable and almost unusable.

I think the most desirable change is to fix the ps_mode itself. But is
seems to be hard work [1], I'm afraid we have to go this way.

Therefore, the first patch of this series disables the ps_mode by default
instead of enabling it on driver init. I'm not sure if explicitly
disabling it is really required or not. I don't have access to the details
of this chip. Let me know if it's enough to just remove the code that
enables ps_mode.

The Second patch adds a new module parameter named "allow_ps_mode". Since
other wifi drivers just disable power_save by default by module parameter
like this, I also added this.

The third patch adds a message when ps_mode will be changed. Useful when
diagnosing connection issues.

Thanks,
Tsuchiya Yuto

[1] https://bugzilla.kernel.org/show_bug.cgi?id=109681

Tsuchiya Yuto (3):
  mwifiex: disable ps_mode explicitly by default instead
  mwifiex: add allow_ps_mode module parameter
  mwifiex: print message when changing ps_mode

 .../net/wireless/marvell/mwifiex/cfg80211.c   | 23 +++++++++++++++++++
 .../net/wireless/marvell/mwifiex/sta_cmd.c    | 11 ++++++---
 2 files changed, 31 insertions(+), 3 deletions(-)

Comments

Tsuchiya Yuto Oct. 30, 2020, 8:26 a.m. UTC | #1 
On Wed, 2020-10-28 at 17:21 +0200, Andy Shevchenko wrote:
> On Wed, Oct 28, 2020 at 11:24:30PM +0900, Tsuchiya Yuto wrote:
> > Hello all,
> > 
> > On Microsoft Surface devices (PCIe-88W8897), we are observing stability
> > issues when ps_mode (IEEE power_save) is enabled, then eventually causes
> > firmware crash. Especially on 5GHz APs, the connection is completely
> > unstable and almost unusable.
> > 
> > I think the most desirable change is to fix the ps_mode itself. But is
> > seems to be hard work [1], I'm afraid we have to go this way.
> > 
> > Therefore, the first patch of this series disables the ps_mode by default
> > instead of enabling it on driver init. I'm not sure if explicitly
> > disabling it is really required or not. I don't have access to the details
> > of this chip. Let me know if it's enough to just remove the code that
> > enables ps_mode.
> > 
> > The Second patch adds a new module parameter named "allow_ps_mode". Since
> > other wifi drivers just disable power_save by default by module parameter
> > like this, I also added this.
> > 
> > The third patch adds a message when ps_mode will be changed. Useful when
> > diagnosing connection issues.
> 
> > [1] https://bugzilla.kernel.org/show_bug.cgi?id=109681
> 
> Can you attach this to the actual patch as BugLink: tag?
> 

Thanks! Indeed I should have added this... I wrote it in the replies.
If I send the v2 version of this series, I'll add it to them.