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From: Paras Sharma <parashar@codeaurora.org>
To: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Jiri Slaby <jslaby@suse.com>,
	linux-arm-msm@vger.kernel.org, linux-serial@vger.kernel.org,
	linux-kernel@vger.kernel.org,
	Paras Sharma <parashar@codeaurora.org>
Subject: [PATCH V2] serial: qcom_geni_serial: To correct QUP Version detection logic
Date: Tue, 11 Aug 2020 13:13:14 +0530
Message-ID: <1597131794-1076-1-git-send-email-parashar@codeaurora.org> (raw)

The current implementation reduces the sampling rate by half
if qup HW version 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 by adding the another check for geni SE major version,
this problem can be solved.

Signed-off-by: Paras Sharma <parashar@codeaurora.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)
 		sampling_rate /= 2;
 
 	clk_rate = get_clk_div_rate(baud, sampling_rate, &clk_div);
-- 
QUALCOMM INDIA, on behalf of Qualcomm Innovation Center, Inc. is a member 
of Code Aurora Forum, hosted by The Linux Foundation


             reply index

Thread overview: 4+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-08-11  7:43 Paras Sharma [this message]
2020-08-11  8:23 ` Greg Kroah-Hartman
2020-08-28  8:18   ` Greg Kroah-Hartman
2020-08-11 10:50 ` Felipe Balbi

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