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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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tty: xuartps: disable clocks when not used
Currently the clocks are enabled at probe and disabled at remove. Instead enable the clocks when used. Signed-off-by: Shubhrajyoti Datta <shubhraj@xilinx.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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0058f0871e
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210417ce83
@ -976,6 +976,23 @@ static void cdns_uart_poll_put_char(struct uart_port *port, unsigned char c)
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}
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#endif
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static void cdns_uart_pm(struct uart_port *port, unsigned int state,
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unsigned int oldstate)
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{
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struct cdns_uart *cdns_uart = port->private_data;
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switch (state) {
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case UART_PM_STATE_OFF:
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clk_disable(cdns_uart->uartclk);
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clk_disable(cdns_uart->pclk);
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break;
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default:
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clk_enable(cdns_uart->pclk);
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clk_enable(cdns_uart->uartclk);
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break;
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}
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}
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static struct uart_ops cdns_uart_ops = {
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.set_mctrl = cdns_uart_set_mctrl,
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.get_mctrl = cdns_uart_get_mctrl,
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@ -987,6 +1004,7 @@ static struct uart_ops cdns_uart_ops = {
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.set_termios = cdns_uart_set_termios,
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.startup = cdns_uart_startup,
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.shutdown = cdns_uart_shutdown,
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.pm = cdns_uart_pm,
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.type = cdns_uart_type,
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.verify_port = cdns_uart_verify_port,
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.request_port = cdns_uart_request_port,
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@ -1350,12 +1368,12 @@ static int cdns_uart_probe(struct platform_device *pdev)
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return PTR_ERR(cdns_uart_data->uartclk);
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}
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rc = clk_prepare_enable(cdns_uart_data->pclk);
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rc = clk_prepare(cdns_uart_data->pclk);
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if (rc) {
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dev_err(&pdev->dev, "Unable to enable pclk clock.\n");
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return rc;
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}
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rc = clk_prepare_enable(cdns_uart_data->uartclk);
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rc = clk_prepare(cdns_uart_data->uartclk);
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if (rc) {
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dev_err(&pdev->dev, "Unable to enable device clock.\n");
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goto err_out_clk_dis_pclk;
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@ -1422,9 +1440,9 @@ static int cdns_uart_probe(struct platform_device *pdev)
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&cdns_uart_data->clk_rate_change_nb);
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#endif
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err_out_clk_disable:
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clk_disable_unprepare(cdns_uart_data->uartclk);
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clk_unprepare(cdns_uart_data->uartclk);
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err_out_clk_dis_pclk:
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clk_disable_unprepare(cdns_uart_data->pclk);
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clk_unprepare(cdns_uart_data->pclk);
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return rc;
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}
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@ -1448,8 +1466,8 @@ static int cdns_uart_remove(struct platform_device *pdev)
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#endif
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rc = uart_remove_one_port(&cdns_uart_uart_driver, port);
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port->mapbase = 0;
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clk_disable_unprepare(cdns_uart_data->uartclk);
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clk_disable_unprepare(cdns_uart_data->pclk);
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clk_unprepare(cdns_uart_data->uartclk);
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clk_unprepare(cdns_uart_data->pclk);
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return rc;
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}
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