Re: [RFC][PATCH] Revert "ARM: dts: bcm2837: Fix polarity of wifi reset GPIOs"

[Ioan-Adrian Ratiu]

Hi Stefan and thank you for looking into this,

On Sun, 27 Jan 2019, Stefan Wahren <stefan.wahren@xxxxxxxx> wrote:
> Hi Ioan-Adrian, 
>
> > Ioan-Adrian Ratiu <adi@xxxxxxxxxx> hat am 27. Januar 2019 um 
> > 21:28 geschrieben:   This reverts commit 
> > bea8a160c621d19f7f78b13e14e03f4b8e44cd4b.   Contrary to what 
> > the commit message says, on my rpi 3 b v1.2 changing the 
> > polarity causes the exact behaviour this commit intends to fix, 
> > as described at the referenced link below (wlan0 disapears). 
> > With reset-gpios = ... GPIO_ACTIVE_HIGH, brcmfmac errors in 
> > dmesg:  [    7.977512] brcmfmac: brcmf_sdio_bus_sleep: error 
> > while changing bus sleep state -110 [    7.977623] brcmfmac: 
> > brcmf_sdio_txfail: sdio error, abort command and terminate 
> > frame [    7.978007] brcmfmac: brcmf_sdio_txfail: sdio error, 
> > abort command and terminate frame [    7.978377] brcmfmac: 
> > brcmf_sdio_txfail: sdio error, abort command and terminate 
> > frame [    7.978724] brcmfmac: brcmf_sdio_dpc: failed backplane 
> > access over SDIO, halting operation [    7.978734] brcmfmac: 
> > brcmf_proto_bcdc_query_dcmd: brcmf_proto_bcdc_msg failed 
> > w/status -110 [    7.978747] brcmfmac: 
> > brcmf_cfg80211_get_channel: chanspec failed (-110) [ 
> > 7.982817] brcmfmac: brcmf_sdio_bus_sleep: error while changing 
> > bus sleep state -110 [    7.982880] brcmfmac: 
> > brcmf_sdio_txfail: sdio error, abort command and terminate 
> > frame [    7.983255] brcmfmac: brcmf_sdio_txfail: sdio error, 
> > abort command and terminate frame  The only solution I 
> > currently have is to revert and everything works as expected 
> > and as before changing the polarity.   Link: 
> > https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=911443 
> > Signed-off-by: Ioan-Adrian Ratiu <adi@xxxxxxxxxx> --- 
>
> reverting this commit will only workaround the real issue. It 
> lies in the sdhci-iproc driver. 
>
> Could please try this instead patch [1]? 

Yes, the patch fixes the bug and it's also in Linus' master branch 
in v5.0-rc3 as commit 2bd44da ("mmc: sdhci-iproc: handle 
mmc_of_parse() errors during prob").

There was just a minor conflict cherry-picking it to 4.19.y 
(sdhci_get_property -> sdhci_get_of_property).

I would really like to have 2bd44da backported to the 4.19 stable 
tree to have wifi working again. Please?

Tested-by: Ioan-Adrian Ratiu <adi@xxxxxxxxxx> #4.19.18

> [1] - https://patchwork.kernel.org/patch/10741809/