[PATCH 5.10 015/406] serial: qcom-geni: fix opp vote on shutdown

Greg Kroah-Hartman
2023-09-17T19:17:46Z

From: Johan Hovold <johan+linaro@kernel.org>

commit 8ece7b754bc34ffd7fcc8269ccb9128e72ca76d8 upstream.

The operating-performance-point vote needs to be dropped when shutting
down the port to avoid wasting power by keeping resources like power
domains in an unnecessarily high performance state (e.g. when a UART
connected Bluetooth controller is not in use).

Fixes: a5819b548af0 ("tty: serial: qcom_geni_serial: Use OPP API to set clk/perf state")
Cc: stable@vger.kernel.org # 5.9
Cc: Rajendra Nayak <quic_rjendra@quicinc.com>
Cc: Matthias Kaehlcke <mka@chromium.org>
Signed-off-by: Johan Hovold <johan+linaro@kernel.org>
Acked-by: Konrad Dybcio <konrad.dybcio@linaro.org>
Link: https://lore.kernel.org/r/20230714130214.14552-2-johan+linaro@kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
drivers/tty/serial/qcom_geni_serial.c | 5 +++++
1 file changed, 5 insertions(+)

--- a/drivers/tty/serial/qcom_geni_serial.c
+++ b/drivers/tty/serial/qcom_geni_serial.c
@@ -125,6 +125,7 @@ struct qcom_geni_serial_port {
u32 tx_fifo_width;
u32 rx_fifo_depth;
bool setup;
+ unsigned long clk_rate;
int (*handle_rx)(struct uart_port *uport, u32 bytes, bool drop);
unsigned int baud;
void *rx_fifo;
@@ -1022,6 +1023,7 @@ static void qcom_geni_serial_set_termios
goto out_restart_rx;

uport->uartclk = clk_rate;
+ port->clk_rate = clk_rate;
dev_pm_opp_set_rate(uport->dev, clk_rate);
ser_clk_cfg = SER_CLK_EN;
ser_clk_cfg |= clk_div << CLK_DIV_SHFT;
@@ -1305,10 +1307,13 @@ static void qcom_geni_serial_pm(struct u

if (new_state == UART_PM_STATE_ON && old_state == UART_PM_STATE_OFF) {
geni_icc_enable(&port->se);
+ if (port->clk_rate)
+ dev_pm_opp_set_rate(uport->dev, port->clk_rate);
geni_se_resources_on(&port->se);
} else if (new_state == UART_PM_STATE_OFF &&
old_state == UART_PM_STATE_ON) {
geni_se_resources_off(&port->se);
+ dev_pm_opp_set_rate(uport->dev, 0);
geni_icc_disable(&port->se);
}
}