linux-kernel - Re: [PATCH] mfd: intel-lpss-pci: fix clock speed for 38a8 UART

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Date:   Mon, 22 Nov 2021 13:22:38 +0200
From:   Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To:     Orlando Chamberlain <redecorating@...tonmail.com>
Cc:     lee.jones@...aro.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] mfd: intel-lpss-pci: fix clock speed for 38a8 UART

On Sat, Nov 20, 2021 at 08:34:26AM +0000, Orlando Chamberlain wrote:

Thanks, my comments below.

> This device is found in the MacBookPro16,2, and as the MacBookPro16,1 is
> from the same generation of MacBooks and has a UART with bxt_uart_info,
> it was incorrectly assumed that the MacBookPro16,2's UART would have the
> same info.
> 
> This led to the wrong clock speed being used, and the Bluetooth
> controller exposed by the UART receiving and sending random data, which
> was incorrectly assumed to be an issue with the Bluetooth stuff, not an
> error with the UART side of things.
> 
> Changing the info to spt_uart_info changes the clock speed and makes it
> send and receive data correctly.

> Fixes: ddb1ada416fd ("mfd: intel-lpss: Add support for MacBookPro16,2 ICL-N UART")
> 
> Signed-off-by: Orlando Chamberlain <redecorating@...tonmail.com>

Tag block shouldn't have blank lines. Otherwise LGTM,
Reviewed-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>

>  drivers/mfd/intel-lpss-pci.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/mfd/intel-lpss-pci.c b/drivers/mfd/intel-lpss-pci.c
> index a872b4485eac..f70464ce8e3d 100644
> --- a/drivers/mfd/intel-lpss-pci.c
> +++ b/drivers/mfd/intel-lpss-pci.c
> @@ -254,7 +254,7 @@ static const struct pci_device_id intel_lpss_pci_ids[] = {
>  	{ PCI_VDEVICE(INTEL, 0x34eb), (kernel_ulong_t)&bxt_i2c_info },
>  	{ PCI_VDEVICE(INTEL, 0x34fb), (kernel_ulong_t)&spt_info },
>  	/* ICL-N */
> -	{ PCI_VDEVICE(INTEL, 0x38a8), (kernel_ulong_t)&bxt_uart_info },
> +	{ PCI_VDEVICE(INTEL, 0x38a8), (kernel_ulong_t)&spt_uart_info },
>  	/* TGL-H */
>  	{ PCI_VDEVICE(INTEL, 0x43a7), (kernel_ulong_t)&bxt_uart_info },
>  	{ PCI_VDEVICE(INTEL, 0x43a8), (kernel_ulong_t)&bxt_uart_info },
> -- 
> 2.34.0
> 
> 

-- 
With Best Regards,
Andy Shevchenko