linux-kernel - Re: [PATCH] iio: imu/mpu6050: support dual-edge IRQ

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Message-ID: <MN2PR12MB33737F067F25B2F7477C4FE5C43C0@MN2PR12MB3373.namprd12.prod.outlook.com>
Date:   Mon, 6 Jan 2020 09:42:00 +0000
From:   Jean-Baptiste Maneyrol <JManeyrol@...ensense.com>
To:     Michał Mirosław <mirq-linux@...e.qmqm.pl>,
        Jonathan Cameron <jic23@...nel.org>,
        Hartmut Knaack <knaack.h@....de>,
        Lars-Peter Clausen <lars@...afoo.de>,
        Peter Meerwald-Stadler <pmeerw@...erw.net>
CC:     "linux-iio@...r.kernel.org" <linux-iio@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] iio: imu/mpu6050: support dual-edge IRQ

Hello Michal,

interesting, thanks a lot.

It would be far better to simply delete the warning log for spurious interrupt. I was thinking that it would only be triggered by a real bug somewhere. I wasn't thinking about systems with any-edge trigger like yours.

So just delete the warn message and no need to add the irq_ignore_spurious logic and variable.

Thanks,
JB

From: linux-iio-owner@...r.kernel.org <linux-iio-owner@...r.kernel.org> on behalf of Michał Mirosław <mirq-linux@...e.qmqm.pl>

Sent: Saturday, January 4, 2020 17:44

To: Jonathan Cameron <jic23@...nel.org>; Hartmut Knaack <knaack.h@....de>; Lars-Peter Clausen <lars@...afoo.de>; Peter Meerwald-Stadler <pmeerw@...erw.net>

Cc: linux-iio@...r.kernel.org <linux-iio@...r.kernel.org>; linux-kernel@...r.kernel.org <linux-kernel@...r.kernel.org>

Subject: [PATCH] iio: imu/mpu6050: support dual-edge IRQ

 


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Make mpu6050 usable on platforms which provide only any-edge interrupts.



Signed-off-by: Michał Mirosław <mirq-linux@...e.qmqm.pl>

---

 drivers/iio/imu/inv_mpu6050/inv_mpu_core.c | 3 ++-

 drivers/iio/imu/inv_mpu6050/inv_mpu_iio.h  | 1 +

 drivers/iio/imu/inv_mpu6050/inv_mpu_ring.c | 6 ++++--

 3 files changed, 7 insertions(+), 3 deletions(-)



diff --git a/drivers/iio/imu/inv_mpu6050/inv_mpu_core.c b/drivers/iio/imu/inv_mpu6050/inv_mpu_core.c

index 0686e41bb8a1..36b6a3922d15 100644

--- a/drivers/iio/imu/inv_mpu6050/inv_mpu_core.c

+++ b/drivers/iio/imu/inv_mpu6050/inv_mpu_core.c

@@ -1239,9 +1239,10 @@ int inv_mpu_core_probe(struct regmap *regmap, int irq, const char *name,

         }

 

         irq_type = irqd_get_trigger_type(desc);

+       st->irq_ignore_spurious = irq_type == (IRQF_TRIGGER_RISING|IRQF_TRIGGER_FALLING);

         if (!irq_type)

                 irq_type = IRQF_TRIGGER_RISING;

-       if (irq_type == IRQF_TRIGGER_RISING)

+       if (irq_type == IRQF_TRIGGER_RISING || st->irq_ignore_spurious)

                 st->irq_mask = INV_MPU6050_ACTIVE_HIGH;

         else if (irq_type == IRQF_TRIGGER_FALLING)

                 st->irq_mask = INV_MPU6050_ACTIVE_LOW;

diff --git a/drivers/iio/imu/inv_mpu6050/inv_mpu_iio.h b/drivers/iio/imu/inv_mpu6050/inv_mpu_iio.h

index b096e010d4ee..94ee7b18b198 100644

--- a/drivers/iio/imu/inv_mpu6050/inv_mpu_iio.h

+++ b/drivers/iio/imu/inv_mpu6050/inv_mpu_iio.h

@@ -158,6 +158,7 @@ struct inv_mpu6050_state {

         struct regmap *map;

         int irq;

         u8 irq_mask;

+       u8 irq_ignore_spurious;

         unsigned skip_samples;

         s64 chip_period;

         s64 it_timestamp;

diff --git a/drivers/iio/imu/inv_mpu6050/inv_mpu_ring.c b/drivers/iio/imu/inv_mpu6050/inv_mpu_ring.c

index 10d16ec5104b..52f02de3d9b0 100644

--- a/drivers/iio/imu/inv_mpu6050/inv_mpu_ring.c

+++ b/drivers/iio/imu/inv_mpu6050/inv_mpu_ring.c

@@ -184,8 +184,10 @@ irqreturn_t inv_mpu6050_read_fifo(int irq, void *p)

                 goto flush_fifo;

         }

         if (!(int_status & INV_MPU6050_BIT_RAW_DATA_RDY_INT)) {

-               dev_warn(regmap_get_device(st->map),

-                       "spurious interrupt with status 0x%x\n", int_status);

+               if (!st->irq_ignore_spurious)

+                       dev_warn(regmap_get_device(st->map),

+                                "spurious interrupt with status 0x%x\n",

+                                int_status);

                 goto end_session;

         }

 

-- 

2.20.1