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

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Message-Id: <1599026211-12800-1-git-send-email-parashar@codeaurora.org>
Date:   Wed,  2 Sep 2020 11:26:51 +0530
From:   Paras Sharma <parashar@...eaurora.org>
To:     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,
        akashast@...eaurora.org, Paras Sharma <parashar@...eaurora.org>
Subject: [PATCH] serial: qcom_geni_serial: To correct QUP Version detection logic

The current implementation reduces the sampling rate by half
if qup HW version is  greater is than 2.5 by checking if the
geni 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 new implementation checks if version is greater than or equal
to 0x20050000 which would work for any future version.

Signed-off-by: Paras Sharma <parashar@...eaurora.org>
---
 drivers/tty/serial/qcom_geni_serial.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/tty/serial/qcom_geni_serial.c b/drivers/tty/serial/qcom_geni_serial.c
index f0b1b47..e18b431 100644
--- a/drivers/tty/serial/qcom_geni_serial.c
+++ b/drivers/tty/serial/qcom_geni_serial.c
@@ -1000,7 +1000,7 @@ 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 (ver >= 0x20050000)
 		sampling_rate /= 2;
 
 	clk_rate = get_clk_div_rate(baud, sampling_rate, &clk_div);
-- 
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