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charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: Hi Fabio, On Thu, Aug 22, 2024 at 08:07:44AM -0300, Fabio Estevam wrote: > Hi Stefan and Oleksij, > > On Wed, Aug 21, 2024 at 8:01 AM Fabio Estevam wrote: > > > This fixes a pca953x probe error on an imx8mp board running linux-stable 6.6: > > > > [ 1.893260] pca953x 2-0020: failed writing register > > [ 1.898258] pca953x 2-0020: probe with driver pca953x failed with error -11 > > > > Could you please add a Fixes tag and Cc stable so that this can reach > > the stable kernels? > > > > Tested-by: Fabio Estevam > > I am sorry, but I have to withdraw my Tested-by tag. > > For debugging purposes, I kept 'fw_devlink=off' in the kernel command > line and that's what made it work. > > Removing 'fw_devlink=off' I still get the probe failure, even with all > the series from Stefan applied: > > [ 1.849097] pca953x 2-0020: supply vcc not found, using dummy regulator > [ 1.855857] pca953x 2-0020: using no AI > [ 1.859965] i2c i2c-2: write failed with -6 > [ 1.865578] pca953x 2-0020: failed writing register: -6 > > In my case, I can get the pca953x driver to probe successfully in one > of the following cases: > > 1. Select pca953x as a module instead of built-in > > or > > 2. Pass 'fw_devlink=off' in the kernel command line > > or > > 3. Register the i2c-imx driver as module_platform_driver(): > > --- a/drivers/i2c/busses/i2c-imx.c > +++ b/drivers/i2c/busses/i2c-imx.c > @@ -1586,17 +1586,7 @@ static struct platform_driver i2c_imx_driver = { > .id_table = imx_i2c_devtype, > }; > > -static int __init i2c_adap_imx_init(void) > -{ > - return platform_driver_register(&i2c_imx_driver); > -} > -subsys_initcall(i2c_adap_imx_init); > - > -static void __exit i2c_adap_imx_exit(void) > -{ > - platform_driver_unregister(&i2c_imx_driver); > -} > -module_exit(i2c_adap_imx_exit); > +module_platform_driver(i2c_imx_driver); > > or > > 4. Use the NXP vendor kernel imx_6.1.22_2.0.0 kernel > > Stefan, do you get the arbitration errors if you try methods 2 or 3 above? I have tried method 3 an it did not work for me. I still have the same issue as before that sometimes the timeout occurs and the ads1015 will not ack anymore. So the patch series is still the only way I found so far to get rid of the problem. I also checked the datasheet of a pca953x device (PCAL6416A) and it doesn't seem to have a timeout mechanism. Therefore, I don't think we are affected by the same issue. Regards, Stefan