Re: Non-working mwifiex_sdio with SD8897

[Takashi Iwai <tiwai@suse.de>]

On Thu, 08 Dec 2016 11:18:23 +0100,
Takashi Iwai wrote:
> 
> Hi Amitkumar,
> 
> On Thu, 08 Dec 2016 06:40:48 +0100,
> Amitkumar Karwar wrote:
> > 
> > Hi Takashi,
> > 
> > > From: Takashi Iwai [mailto:tiwai@suse.de]
> > > Sent: Friday, December 02, 2016 10:19 PM
> > > To: Amitkumar Karwar; Nishant Sarmukadam
> > > Cc: linux-wireless@vger.kernel.org; Oliver Neukum
> > > Subject: Non-working mwifiex_sdio with SD8897
> > > 
> > > Hi,
> > > 
> > > we've got an Intel Cherry Trail-based system with Marvell SD8897 chip
> > > over MMC (sdhci), and WiFi / BT always fails at starting (or better to
> > > say, it never worked properly).
> > > 
> > > For avoiding the race between WiFi and BT, I blacklisted btmrvl_sdio,
> > > so let's concentrate only on mwifiex_sdio now.
> > > 
> > > At the beginning of the driver loading, it looks fine:
> > > 
> > >  mwifiex_sdio mmc1:0001:1: info: FW download over, size 802164 bytes
> > > mwifiex_sdio mmc1:0001:1: WLAN FW is active  mwifiex_sdio mmc1:0001:1:
> > > info: MWIFIEX VERSION: mwifiex 1.0 (15.68.7.p77)  mwifiex_sdio
> > > mmc1:0001:1: driver_version = mwifiex 1.0 (15.68.7.p77)
> > >  cfg80211: Regulatory domain changed to country: US  .....
> > > 
> > > Then it gets a timeout
> > > 
> > >  mwifiex_sdio mmc1:0001:1: mwifiex_cmd_timeout_func: Timeout cmd id =
> > > 0x107, act = 0x0  mwifiex_sdio mmc1:0001:1: num_data_h2c_failure = 0
> > > mwifiex_sdio mmc1:0001:1: num_cmd_h2c_failure = 0  mwifiex_sdio
> > > mmc1:0001:1: is_cmd_timedout = 1  mwifiex_sdio mmc1:0001:1:
> > > num_tx_timeout = 0  mwifiex_sdio mmc1:0001:1: last_cmd_index = 4
> > > mwifiex_sdio mmc1:0001:1: last_cmd_id: 1e 00 0c 01 1e 00 20 00 07 01
> > > mwifiex_sdio mmc1:0001:1: last_cmd_act: 00 00 01 00 00 00 08 00 00 00
> > > mwifiex_sdio mmc1:0001:1: last_cmd_resp_index = 3  mwifiex_sdio
> > > mmc1:0001:1: last_cmd_resp_id: 1e 80 0c 81 1e 80 20 80 20 80
> > > mwifiex_sdio mmc1:0001:1: last_event_index = 1  mwifiex_sdio
> > > mmc1:0001:1: last_event: 00 00 0b 00 00 00 00 00 00 00  mwifiex_sdio
> > > mmc1:0001:1: data_sent=0 cmd_sent=0  mwifiex_sdio mmc1:0001:1:
> > > ps_mode=1 ps_state=1  mwifiex_sdio mmc1:0001:1: ===mwifiex driverinfo
> > > dump start===  mwifiex_sdio mmc1:0001:1: info: MWIFIEX VERSION: mwifiex
> > > 1.0 (15.68.7.p77)  mwifiex_sdio mmc1:0001:1: SDIO register dump start
> > > mwifiex_sdio mmc1:0001:1: SDIO Func0 (0x0-0x9): 43 03 02 02 03 02 00 02
> > > 03 00  mwifiex_sdio mmc1:0001:1: SDIO Func1 (0x0-0xb): 02 ff c3 40 00
> > > 00 00 00 ff ff ff ff  mwifiex_sdio mmc1:0001:1: SDIO Func1: (0x4c) 00
> > > (0x50) 08 (0x54) 07 (0x55) 0c (0x58) 10 (0x59) 00 (0x5c) 00 (0x5d) 00
> > > mwifiex_sdio mmc1:0001:1: SDIO Func1 (0xc0-0xca): dc fe 6c 00 10 00 3f
> > > 36 36 02 20  mwifiex_sdio mmc1:0001:1: SDIO Func1 (0xc0-0xca): dc fe 76
> > > 00 1a 00 3f 36 36 02 20  mwifiex_sdio mmc1:0001:1: SDIO register dump
> > > end  mwifiex_sdio mmc1:0001:1: ===mwifiex driverinfo dump end===
> > > mwifiex_sdio mmc1:0001:1: == mwifiex firmware dump start ==
> > > mwifiex_sdio mmc1:0001:1: Ignore scan. Card removed or firmware in bad
> > > state  mwifiex_sdio mmc1:0001:1: scan failed: -14  mwifiex_sdio
> > > mmc1:0001:1: == mwifiex firmware dump end ==  mwifiex_sdio mmc1:0001:1:
> > > == mwifiex dump information to /sys/class/devcoredump start
> > > mwifiex_sdio mmc1:0001:1: == mwifiex dump information to
> > > /sys/class/devcoredump end
> > > 
> > 
> > Could you please try attached 7.p87 firmware? I will be submitting it upstream soon.
> 
> Thanks!  I tried it, but unfortunately the issue still remains.

It seems that the problem is rather in the MMC / SDIO side.
When the power management of the SD host PCI controller is turned off
(i.e. echo on > /sys/devices/pci0000:00/0000:00:11.0/power/control),
the WiFi starts working.

I'm not sure whether it's a bug in sdhci driver or something else
missing.  In anyway, thank you for your help!


Takashi