Messages in this thread | | | Date | Tue, 1 Sep 2020 11:20:46 +0300 | From | Andy Shevchenko <> | Subject | Re: [PATCH] i2c: algo-pca: Reapply i2c bus settings after reset |
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On Tue, Sep 01, 2020 at 12:57:13PM +1200, Evan Nimmo wrote:
Thanks for the patch, my nit-picks, comments below.
> If something goes wrong (such as the SCL being stuck low) then we need > to reset the pca chip. The issue with this is that on reset we lose all
pca -> PCA (here and where it applicable below).
> config settings and the chip ends up in a disabled state which results > in a lock up/high cpu usage. We need to re-apply any configuration that > had previously been set and re-enable the chip.
...
> + /* We need to apply any configuration settings that > + * were calculated in the pca_init function. The reset > + * results in these changes being set back to defaults. > + */
/* * Multi-line comments usually go * like this. */
...
> + clock = pca_clock(pca_data); > + > + /* Store settings as these will be needed when the pca chip is reset */ > + pca_data->bus_settings.clock_freq = clock; > + > pca_reset(pca_data); >
> - clock = pca_clock(pca_data); > printk(KERN_INFO "%s: Clock frequency is %dkHz\n", > adap->name, freqs[clock]);
Seems this message is attached to above call. Can we move it as well?
...
> +/** > + * struct i2c_bus_settings - The configured i2c bus settings > + * @mode: Configured i2c bus mode (PCA9665) > + * @tlow: Configured SCL LOW period (PCA9665) > + * @thi: Configured SCL HIGH period (PCA9665) > + * @clock_freq: The configured clock frequency (PCA9564) > + */ > +struct i2c_bus_settings { > + int mode; > + int tlow; > + int thi; > + int clock_freq; > +};
This is a good candidate to have it in generic header for sake of the unification. Possible users:
struct tegra_i2c_hw_feature struct cci_data::struct hw_params
-- With Best Regards, Andy Shevchenko
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