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serial: qcom-geni: fix opp vote on shutdown
commit8ece7b754b
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:a5819b548a
("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>
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1 changed files with 5 additions and 0 deletions
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@ -125,6 +125,7 @@ struct qcom_geni_serial_port {
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u32 tx_fifo_width;
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u32 rx_fifo_depth;
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bool setup;
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unsigned long clk_rate;
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int (*handle_rx)(struct uart_port *uport, u32 bytes, bool drop);
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unsigned int baud;
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void *rx_fifo;
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@ -1022,6 +1023,7 @@ static void qcom_geni_serial_set_termios(struct uart_port *uport,
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goto out_restart_rx;
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uport->uartclk = clk_rate;
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port->clk_rate = clk_rate;
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dev_pm_opp_set_rate(uport->dev, clk_rate);
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ser_clk_cfg = SER_CLK_EN;
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ser_clk_cfg |= clk_div << CLK_DIV_SHFT;
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@ -1291,10 +1293,13 @@ static void qcom_geni_serial_pm(struct uart_port *uport,
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if (new_state == UART_PM_STATE_ON && old_state == UART_PM_STATE_OFF) {
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geni_icc_enable(&port->se);
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if (port->clk_rate)
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dev_pm_opp_set_rate(uport->dev, port->clk_rate);
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geni_se_resources_on(&port->se);
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} else if (new_state == UART_PM_STATE_OFF &&
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old_state == UART_PM_STATE_ON) {
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geni_se_resources_off(&port->se);
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dev_pm_opp_set_rate(uport->dev, 0);
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geni_icc_disable(&port->se);
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}
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}
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