Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) client-ip=23.128.96.18;
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,
        akashast@codeaurora.org, Paras Sharma <parashar@codeaurora.org>
Subject: [PATCH] serial: qcom_geni_serial: To correct QUP Version detection logic
Date:   Wed,  2 Sep 2020 11:26:51 +0530
Message-Id: <1599026211-12800-1-git-send-email-parashar@codeaurora.org>
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

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@codeaurora.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);
-- 
QUALCOMM INDIA, on behalf of Qualcomm Innovation Center, Inc. is a member 
of Code Aurora Forum, hosted by The Linux Foundation