* [PROBLEM]: Error during probing process in inv_icm42600_i2c driver [not found] <20211208135644.3523024-1-n.latmos@deepsea.ai> @ 2021-12-08 14:33 ` Nikos Latmos 2022-01-30 15:17 ` Jonathan Cameron 0 siblings, 1 reply; 4+ messages in thread From: Nikos Latmos @ 2021-12-08 14:33 UTC (permalink / raw) To: jmaneyrol, jic23, lars, linux-iio, linux-kernel Hello, I have an ARM device based on the Broadcom BCM2837 processor (quad-core ARM Cortex-A53, 1.2GHz), which has an Invensense ICM-42605 IMU chip connected over I2C. I'm running an unmodified Linux 5.4.83 kernel. The I2C driver for my device is in the following path: drivers/iio/imu/inv_icm42600/inv_icm42600_i2c.c. The problem is that the device driver cannot be probed. More specifically, dmesg returns the following error message: inv-icm42600-i2c 0-0068: mounting matrix not found: using identity... inv-icm42600-i2c 0-0068: 0-0068 supply vdd not found, using dummy regulator inv-icm42600-i2c 0-0068: 0-0068 supply vddio not found, using dummy regulator inv-icm42600-i2c: probe of 0-0068 failed with error -121 During the debugging procedure, I found out that the failure occurred when the driver tried to set up the I2C bus parameters. More precisely, by setting the INV_ICM42600_REG_INTF_CONFIG6 register according to the values described in the datasheet for the I2C communication, actually caused the probe function to fail and return the error -121. After I experimented with different values in the specific register bits, I came to the conclusion, that the setting of the bit INV_ICM42600_INTF_CONFIG6_I3C_SDR_EN caused the system to successfully probe the driver. Any other bit setting combinations failed to do so. Any hints on why would the driver behave so? Here is a patch that I have so far and it seems to solve the issue. Best regards, Nick Latmos From d7b3922cd0182ba880ff729edb4a156b55dfb6f0 Mon Sep 17 00:00:00 2001 From: nicklat <n.latmos@deepsea.ai> Date: Wed, 8 Dec 2021 15:51:28 +0200 Subject: [PATCH] iio: imu: inv_icm42600: enable SDR mode Add SDR (Single Data Rate) support. In SDR mode, data is only clocked on one edge of the clock. Without this option enabled, the probing process fails. Signed-off-by: nicklat <n.latmos@deepsea.ai> --- drivers/iio/imu/inv_icm42600/inv_icm42600_i2c.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/drivers/iio/imu/inv_icm42600/inv_icm42600_i2c.c b/drivers/iio/imu/inv_icm42600/inv_icm42600_i2c.c index 85b1934cec60..ea31f102fbca 100644 --- a/drivers/iio/imu/inv_icm42600/inv_icm42600_i2c.c +++ b/drivers/iio/imu/inv_icm42600/inv_icm42600_i2c.c @@ -21,7 +21,8 @@ static int inv_icm42600_i2c_bus_setup(struct inv_icm42600_state *st) /* setup interface registers */ ret = regmap_update_bits(st->map, INV_ICM42600_REG_INTF_CONFIG6, INV_ICM42600_INTF_CONFIG6_MASK, - INV_ICM42600_INTF_CONFIG6_I3C_EN); + INV_ICM42600_INTF_CONFIG6_I3C_EN | + INV_ICM42600_INTF_CONFIG6_I3C_SDR_EN); if (ret) return ret; -- 2.25.1 ^ permalink raw reply related [flat|nested] 4+ messages in thread
* Re: [PROBLEM]: Error during probing process in inv_icm42600_i2c driver 2021-12-08 14:33 ` [PROBLEM]: Error during probing process in inv_icm42600_i2c driver Nikos Latmos @ 2022-01-30 15:17 ` Jonathan Cameron 2022-01-31 12:44 ` Jean-Baptiste Maneyrol 0 siblings, 1 reply; 4+ messages in thread From: Jonathan Cameron @ 2022-01-30 15:17 UTC (permalink / raw) To: Nikos Latmos; +Cc: jmaneyrol, lars, linux-iio, linux-kernel On Wed, 8 Dec 2021 16:33:52 +0200 Nikos Latmos <n.latmos@deepsea.ai> wrote: > Hello, > > I have an ARM device based on the Broadcom BCM2837 processor (quad-core > ARM Cortex-A53, 1.2GHz), which has an Invensense ICM-42605 IMU chip > connected over I2C. I'm running an unmodified Linux 5.4.83 kernel. The I2C > driver for my device is in the following path: > drivers/iio/imu/inv_icm42600/inv_icm42600_i2c.c. > > The problem is that the device driver cannot be probed. More specifically, > dmesg returns the following error message: > > inv-icm42600-i2c 0-0068: mounting matrix not found: using identity... > inv-icm42600-i2c 0-0068: 0-0068 supply vdd not found, using dummy regulator > inv-icm42600-i2c 0-0068: 0-0068 supply vddio not found, using dummy regulator > inv-icm42600-i2c: probe of 0-0068 failed with error -121 > > During the debugging procedure, I found out that the failure occurred when > the driver tried to set up the I2C bus parameters. More precisely, by setting > the INV_ICM42600_REG_INTF_CONFIG6 register according to the values described > in the datasheet for the I2C communication, actually caused the probe function > to fail and return the error -121. > > After I experimented with different values in the specific register bits, > I came to the conclusion, that the setting of the bit > INV_ICM42600_INTF_CONFIG6_I3C_SDR_EN caused the system to successfully > probe the driver. Any other bit setting combinations failed to do so. > > Any hints on why would the driver behave so? > > Here is a patch that I have so far and it seems to solve the issue. > > Best regards, > Nick Latmos Hi All, Anyone familiar with this part able to help Nick? Thanks, Jonathan > > > From d7b3922cd0182ba880ff729edb4a156b55dfb6f0 Mon Sep 17 00:00:00 2001 > From: nicklat <n.latmos@deepsea.ai> > Date: Wed, 8 Dec 2021 15:51:28 +0200 > Subject: [PATCH] iio: imu: inv_icm42600: enable SDR mode > > Add SDR (Single Data Rate) support. > In SDR mode, data is only clocked on one edge of the clock. > > Without this option enabled, the probing process fails. > > Signed-off-by: nicklat <n.latmos@deepsea.ai> > --- > drivers/iio/imu/inv_icm42600/inv_icm42600_i2c.c | 3 ++- > 1 file changed, 2 insertions(+), 1 deletion(-) > > diff --git a/drivers/iio/imu/inv_icm42600/inv_icm42600_i2c.c > b/drivers/iio/imu/inv_icm42600/inv_icm42600_i2c.c > index 85b1934cec60..ea31f102fbca 100644 > --- a/drivers/iio/imu/inv_icm42600/inv_icm42600_i2c.c > +++ b/drivers/iio/imu/inv_icm42600/inv_icm42600_i2c.c > @@ -21,7 +21,8 @@ static int inv_icm42600_i2c_bus_setup(struct > inv_icm42600_state *st) > /* setup interface registers */ > ret = regmap_update_bits(st->map, INV_ICM42600_REG_INTF_CONFIG6, > INV_ICM42600_INTF_CONFIG6_MASK, > - INV_ICM42600_INTF_CONFIG6_I3C_EN); > + INV_ICM42600_INTF_CONFIG6_I3C_EN | > + INV_ICM42600_INTF_CONFIG6_I3C_SDR_EN); > if (ret) > return ret; > > -- > 2.25.1 ^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: [PROBLEM]: Error during probing process in inv_icm42600_i2c driver 2022-01-30 15:17 ` Jonathan Cameron @ 2022-01-31 12:44 ` Jean-Baptiste Maneyrol 2022-02-02 15:02 ` Andy Shevchenko 0 siblings, 1 reply; 4+ messages in thread From: Jean-Baptiste Maneyrol @ 2022-01-31 12:44 UTC (permalink / raw) To: Jonathan Cameron, Nikos Latmos; +Cc: jmaneyrol, lars, linux-iio, linux-kernel Hello, this is a known issue. When setting I2C parameters, it enables some specific filter for improving transfer quality. These filters are by default disabled to enable I3C usage. This operation creates a spike in the lines that make the transaction fails even if it is in fact doing OK. Do not change the register value. The fix is to ignore the return value of the regmap_update_bits done on INV_ICM42600_REG_INTF_CONFIG6. If you want to create a patch, it would be very welcomed I could review it. Thanks, JB From: Jonathan Cameron <jic23@kernel.org> Sent: Sunday, January 30, 2022 16:17 To: Nikos Latmos <n.latmos@deepsea.ai> Cc: jmaneyrol@invensense.com <jmaneyrol@invensense.com>; lars@metafoo.de <lars@metafoo.de>; linux-iio@vger.kernel.org <linux-iio@vger.kernel.org>; linux-kernel@vger.kernel.org <linux-kernel@vger.kernel.org> Subject: Re: [PROBLEM]: Error during probing process in inv_icm42600_i2c driver CAUTION: This email originated from outside of the organization. Please make sure the sender is who they say they are and do not click links or open attachments unless you recognize the sender and know the content is safe. On Wed, 8 Dec 2021 16:33:52 +0200 Nikos Latmos <n.latmos@deepsea.ai> wrote: > Hello, > > I have an ARM device based on the Broadcom BCM2837 processor (quad-core > ARM Cortex-A53, 1.2GHz), which has an Invensense ICM-42605 IMU chip > connected over I2C. I'm running an unmodified Linux 5.4.83 kernel. The I2C > driver for my device is in the following path: > drivers/iio/imu/inv_icm42600/inv_icm42600_i2c.c. > > The problem is that the device driver cannot be probed. More specifically, > dmesg returns the following error message: > > inv-icm42600-i2c 0-0068: mounting matrix not found: using identity... > inv-icm42600-i2c 0-0068: 0-0068 supply vdd not found, using dummy regulator > inv-icm42600-i2c 0-0068: 0-0068 supply vddio not found, using dummy regulator > inv-icm42600-i2c: probe of 0-0068 failed with error -121 > > During the debugging procedure, I found out that the failure occurred when > the driver tried to set up the I2C bus parameters. More precisely, by setting > the INV_ICM42600_REG_INTF_CONFIG6 register according to the values described > in the datasheet for the I2C communication, actually caused the probe function > to fail and return the error -121. > > After I experimented with different values in the specific register bits, > I came to the conclusion, that the setting of the bit > INV_ICM42600_INTF_CONFIG6_I3C_SDR_EN caused the system to successfully > probe the driver. Any other bit setting combinations failed to do so. > > Any hints on why would the driver behave so? > > Here is a patch that I have so far and it seems to solve the issue. > > Best regards, > Nick Latmos Hi All, Anyone familiar with this part able to help Nick? Thanks, Jonathan > > > From d7b3922cd0182ba880ff729edb4a156b55dfb6f0 Mon Sep 17 00:00:00 2001 > From: nicklat <n.latmos@deepsea.ai> > Date: Wed, 8 Dec 2021 15:51:28 +0200 > Subject: [PATCH] iio: imu: inv_icm42600: enable SDR mode > > Add SDR (Single Data Rate) support. > In SDR mode, data is only clocked on one edge of the clock. > > Without this option enabled, the probing process fails. > > Signed-off-by: nicklat <n.latmos@deepsea.ai> > --- > drivers/iio/imu/inv_icm42600/inv_icm42600_i2c.c | 3 ++- > 1 file changed, 2 insertions(+), 1 deletion(-) > > diff --git a/drivers/iio/imu/inv_icm42600/inv_icm42600_i2c.c > b/drivers/iio/imu/inv_icm42600/inv_icm42600_i2c.c > index 85b1934cec60..ea31f102fbca 100644 > --- a/drivers/iio/imu/inv_icm42600/inv_icm42600_i2c.c > +++ b/drivers/iio/imu/inv_icm42600/inv_icm42600_i2c.c > @@ -21,7 +21,8 @@ static int inv_icm42600_i2c_bus_setup(struct > inv_icm42600_state *st) > /* setup interface registers */ > ret = regmap_update_bits(st->map, INV_ICM42600_REG_INTF_CONFIG6, > INV_ICM42600_INTF_CONFIG6_MASK, > - INV_ICM42600_INTF_CONFIG6_I3C_EN); > + INV_ICM42600_INTF_CONFIG6_I3C_EN | > + INV_ICM42600_INTF_CONFIG6_I3C_SDR_EN); > if (ret) > return ret; > > -- > 2.25.1 ^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: [PROBLEM]: Error during probing process in inv_icm42600_i2c driver 2022-01-31 12:44 ` Jean-Baptiste Maneyrol @ 2022-02-02 15:02 ` Andy Shevchenko 0 siblings, 0 replies; 4+ messages in thread From: Andy Shevchenko @ 2022-02-02 15:02 UTC (permalink / raw) To: Jean-Baptiste Maneyrol Cc: Jonathan Cameron, Nikos Latmos, jmaneyrol, lars, linux-iio, linux-kernel On Tue, Feb 1, 2022 at 10:17 PM Jean-Baptiste Maneyrol <Jean-Baptiste.Maneyrol@tdk.com> wrote: > > Hello, > > this is a known issue. When setting I2C parameters, it enables some specific filter for improving transfer quality. These filters are by default disabled to enable I3C usage. > > This operation creates a spike in the lines that make the transaction fails even if it is in fact doing OK. > > Do not change the register value. The fix is to ignore the return value of the regmap_update_bits done on INV_ICM42600_REG_INTF_CONFIG6. > > If you want to create a patch, it would be very welcomed I could review it. That patch should have a good comment to summarize the above. -- With Best Regards, Andy Shevchenko ^ permalink raw reply [flat|nested] 4+ messages in thread
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2021-12-08 14:33 ` [PROBLEM]: Error during probing process in inv_icm42600_i2c driver Nikos Latmos
2022-01-30 15:17 ` Jonathan Cameron
2022-01-31 12:44 ` Jean-Baptiste Maneyrol
2022-02-02 15:02 ` Andy Shevchenko
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