linux-kernel - [PATCH 6/6] wifi: wilc1000: disable SDIO func IRQ before suspend

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Message-Id: <20240613-wilc_suspend-v1-6-c2f766d0988c@bootlin.com>
Date: Thu, 13 Jun 2024 16:06:45 +0200
From: Alexis Lothoré <alexis.lothore@...tlin.com>
To: linux-wireless@...r.kernel.org
Cc: Ajay Singh <ajay.kathat@...rochip.com>, 
 Claudiu Beznea <claudiu.beznea@...on.dev>, Kalle Valo <kvalo@...nel.org>, 
 Thomas Petazzoni <thomas.petazzoni@...tlin.com>, 
 linux-kernel@...r.kernel.org, 
 Alexis Lothoré <alexis.lothore@...tlin.com>
Subject: [PATCH 6/6] wifi: wilc1000: disable SDIO func IRQ before suspend

Issuing a system suspend command raises the following warning:
WARNING: CPU: 0 PID: 15 at drivers/mmc/core/sdio.c:1042 mmc_sdio_suspend+0xd4/0x19c
CPU: 0 PID: 15 Comm: kworker/u2:1 Not tainted 6.7.0-rc1-wt+ #710
Hardware name: Atmel SAMA5
Workqueue: events_unbound async_run_entry_fn
 unwind_backtrace from show_stack+0x18/0x1c
 show_stack from dump_stack_lvl+0x34/0x48
 dump_stack_lvl from __warn+0x98/0x160
 __warn from warn_slowpath_fmt+0xcc/0x140
 warn_slowpath_fmt from mmc_sdio_suspend+0xd4/0x19c
 mmc_sdio_suspend from mmc_bus_suspend+0x50/0x70
 mmc_bus_suspend from dpm_run_callback+0xe4/0x248
 dpm_run_callback from __device_suspend+0x234/0x91c
 __device_suspend from async_suspend+0x24/0x9c
 async_suspend from async_run_entry_fn+0x6c/0x210
 async_run_entry_fn from process_one_work+0x3a0/0x870
[...]

This warning is due to a check in SDIO core ensuring that interrupts do not
remain enabled for cards being powered down during suspend. WILC driver
currently does not set the MMC_PM_KEEP_POWER flag, so disable interrupt
when entering resume.

Signed-off-by: Alexis Lothoré <alexis.lothore@...tlin.com>
---
 drivers/net/wireless/microchip/wilc1000/sdio.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/net/wireless/microchip/wilc1000/sdio.c b/drivers/net/wireless/microchip/wilc1000/sdio.c
index 4e7014670945..0043f7a0fdf9 100644
--- a/drivers/net/wireless/microchip/wilc1000/sdio.c
+++ b/drivers/net/wireless/microchip/wilc1000/sdio.c
@@ -982,6 +982,8 @@ static int wilc_sdio_suspend(struct device *dev)
 
 	host_sleep_notify(wilc);
 
+	wilc_sdio_disable_interrupt(wilc);
+
 	ret = wilc_sdio_reset(wilc);
 	if (ret) {
 		dev_err(&func->dev, "Fail reset sdio\n");
@@ -998,6 +1000,7 @@ static int wilc_sdio_resume(struct device *dev)
 
 	dev_info(dev, "sdio resume\n");
 	wilc_sdio_init(wilc, true);
+	wilc_sdio_enable_interrupt(wilc);
 
 	host_wakeup_notify(wilc);
 

-- 
2.45.2