linux-kernel - Re: [PATCH V2] serial: qcom_geni_serial: To correct QUP Version detection logic

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Date:   Tue, 11 Aug 2020 13:50:19 +0300
From:   Felipe Balbi <balbi@...nel.org>
To:     Paras Sharma <parashar@...eaurora.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     Jiri Slaby <jslaby@...e.com>, linux-arm-msm@...r.kernel.org,
        linux-serial@...r.kernel.org, linux-kernel@...r.kernel.org,
        Paras Sharma <parashar@...eaurora.org>
Subject: Re: [PATCH V2] serial: qcom_geni_serial: To correct QUP Version detection logic


Hi,

Paras Sharma <parashar@...eaurora.org> writes:
> The current implementation reduces the sampling rate by half
> if qup HW version greater is than 2.5 by checking if the geni
                    ^^^^^^^^^^^^^^^
                    is greater than

could, possibly, be fixed while applying.

> SE major version is greater than 2 and geni SE minor version
> is greater than 5.
>
> This implementation fails when the version is 3 or greater.
>
> Hence by adding the another check for geni SE major version,
> this problem can be solved.
>
> Signed-off-by: Paras Sharma <parashar@...eaurora.org>
> ---
>  drivers/tty/serial/qcom_geni_serial.c | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/tty/serial/qcom_geni_serial.c b/drivers/tty/serial/qcom_geni_serial.c
> index 3aa29d2..a9f92d8 100644
> --- a/drivers/tty/serial/qcom_geni_serial.c
> +++ b/drivers/tty/serial/qcom_geni_serial.c
> @@ -995,7 +995,8 @@ static void qcom_geni_serial_set_termios(struct uart_port *uport,
>  	sampling_rate = UART_OVERSAMPLING;
>  	/* Sampling rate is halved for IP versions >= 2.5 */
>  	ver = geni_se_get_qup_hw_version(&port->se);
> -	if (GENI_SE_VERSION_MAJOR(ver) >= 2 && GENI_SE_VERSION_MINOR(ver) >= 5)
> +	if ((GENI_SE_VERSION_MAJOR(ver) >= 2 && GENI_SE_VERSION_MINOR(ver) >= 5)
> +		|| GENI_SE_VERSION_MAJOR(ver) >= 3)

it looks like having a single GENI_SE_VERSION() that returns MAJOR and
MINOR without STEP would look better here. Then you could use:

	if (GENI_SE_VERSION(ver) >= 0x20050000)

and it would work for any future version. Not a strong opinion, though

-- 
balbi

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