linux-kernel - Re: REGRESSION: "wlcore: sdio: allow pm to handle sdio power" breaks wifi on HiKey960

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Date:   Tue, 12 Jun 2018 21:13:19 -0700
From:   Tony Lindgren <tony@...mide.com>
To:     John Stultz <john.stultz@...aro.org>
Cc:     Kalle Valo <kvalo@...eaurora.org>, Eyal Reizer <eyalr@...com>,
        Valentin Schneider <Valentin.Schneider@....com>,
        lkml <linux-kernel@...r.kernel.org>
Subject: Re: REGRESSION: "wlcore: sdio: allow pm to handle sdio power" breaks
 wifi on HiKey960

* John Stultz <john.stultz@...aro.org> [180612 22:15]:
> Hey Folks,
>   I noticed with linus/master wifi wasn't coming up on HiKey960. I
> bisected it down and it seems to be due to:
> 
> 60f36637bbbd ("wlcore: sdio: allow pm to handle sdio power")  and
> 728a9dc61f13 ("wlcore: sdio: Fix flakey SDIO runtime PM handling")
>
> When wifi fails to load, the only useful error message I see is:
> [    8.466097] wl1271_sdio mmc1:0001:2: wl12xx_sdio_power_on: failed
> to get_sync(-13)

Sorry to hear about that.

> Reverting those two changes gets wifi working again for me:
> [    8.754953] wlcore: wl18xx HW: 183x or 180x, PG 2.2 (ROM 0x11)
> [    8.761778] random: crng init done
> [    8.765185] random: 7 urandom warning(s) missed due to ratelimiting
> [    8.779149] wlcore: loaded
> ...
> [   12.945903] wlcore: PHY firmware version: Rev 8.2.0.0.237
> [   13.058077] wlcore: firmware booted (Rev 8.9.0.0.70)
> 
> 
> Any suggestions how to resolve this w/o a revert?

Sounds like we need to ignore also -EACCES if runtime PM is
disabled for MMC. Care to try and see if the patch below
helps?

Regards,

Tony

8< ------------------------
diff --git a/drivers/net/wireless/ti/wlcore/sdio.c b/drivers/net/wireless/ti/wlcore/sdio.c
--- a/drivers/net/wireless/ti/wlcore/sdio.c
+++ b/drivers/net/wireless/ti/wlcore/sdio.c
@@ -155,7 +155,7 @@ static int wl12xx_sdio_power_on(struct wl12xx_sdio_glue *glue)
 	struct mmc_card *card = func->card;
 
 	ret = pm_runtime_get_sync(&card->dev);
-	if (ret < 0) {
+	if (ret < 0 && ret != -EACCES) {
 		pm_runtime_put_noidle(&card->dev);
 		dev_err(glue->dev, "%s: failed to get_sync(%d)\n",
 			__func__, ret);
@@ -182,7 +182,7 @@ static int wl12xx_sdio_power_off(struct wl12xx_sdio_glue *glue)
 
 	/* Let runtime PM know the card is powered off */
 	error = pm_runtime_put(&card->dev);
-	if (error < 0 && error != -EBUSY) {
+	if (error < 0 && error != -EBUSY && error != -EACCES) {
 		dev_err(&card->dev, "%s failed: %i\n", __func__, error);
 
 		return error;