[PATCH V2] serial: qcom_geni_serial: To correct QUP Version detection logic

From: Paras Sharma
Date: Tue Aug 11 2020 - 03:43:56 EST


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@xxxxxxxxxxxxxx>
---
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);
--
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