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authorRajendra Nayak <rnayak@codeaurora.org>2020-05-03 17:34:24 +0530
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2020-05-05 16:24:21 +0200
commit3d9231e69831551da3a78a618b31702ea4dedd5e (patch)
tree09d9ccc52282b9dab5e954f5f3ec58b6f284c4b0 /drivers/tty/serial/qcom_geni_serial.c
parentc2880ec6c0862e11673742ab512c262b5e97a34c (diff)
downloadlinux-3d9231e69831551da3a78a618b31702ea4dedd5e.tar.bz2
tty: serial: qcom_geni_serial: Use OPP API to set clk/perf state
geni serial needs to express a perforamnce state requirement on CX powerdomain depending on the frequency of the clock rates. Use OPP table from DT to register with OPP framework and use dev_pm_opp_set_rate() to set the clk/perf state. Signed-off-by: Rajendra Nayak <rnayak@codeaurora.org> Reviewed-by: Matthias Kaehlcke <mka@chromium.org> Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Cc: Akash Asthana <akashast@codeaurora.org> Cc: linux-serial@vger.kernel.org Link: https://lore.kernel.org/r/1588507469-31889-2-git-send-email-rnayak@codeaurora.org Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/tty/serial/qcom_geni_serial.c')
-rw-r--r--drivers/tty/serial/qcom_geni_serial.c34
1 files changed, 29 insertions, 5 deletions
diff --git a/drivers/tty/serial/qcom_geni_serial.c b/drivers/tty/serial/qcom_geni_serial.c
index 6119090ce045..dd3d1ba38bd9 100644
--- a/drivers/tty/serial/qcom_geni_serial.c
+++ b/drivers/tty/serial/qcom_geni_serial.c
@@ -9,6 +9,7 @@
#include <linux/module.h>
#include <linux/of.h>
#include <linux/of_device.h>
+#include <linux/pm_opp.h>
#include <linux/platform_device.h>
#include <linux/pm_runtime.h>
#include <linux/pm_wakeirq.h>
@@ -961,7 +962,7 @@ static void qcom_geni_serial_set_termios(struct uart_port *uport,
goto out_restart_rx;
uport->uartclk = clk_rate;
- clk_set_rate(port->se.clk, 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;
@@ -1198,8 +1199,11 @@ static void qcom_geni_serial_pm(struct uart_port *uport,
if (new_state == UART_PM_STATE_ON && old_state == UART_PM_STATE_OFF)
geni_se_resources_on(&port->se);
else if (new_state == UART_PM_STATE_OFF &&
- old_state == UART_PM_STATE_ON)
+ old_state == UART_PM_STATE_ON) {
+ /* Drop the performance state vote */
+ dev_pm_opp_set_rate(uport->dev, 0);
geni_se_resources_off(&port->se);
+ }
}
static const struct uart_ops qcom_geni_console_pops = {
@@ -1318,13 +1322,25 @@ static int qcom_geni_serial_probe(struct platform_device *pdev)
if (of_property_read_bool(pdev->dev.of_node, "cts-rts-swap"))
port->cts_rts_swap = true;
+ port->se.opp_table = dev_pm_opp_set_clkname(&pdev->dev, "se");
+ if (IS_ERR(port->se.opp_table))
+ return PTR_ERR(port->se.opp_table);
+ /* OPP table is optional */
+ ret = dev_pm_opp_of_add_table(&pdev->dev);
+ if (!ret) {
+ port->se.has_opp_table = true;
+ } else if (ret != -ENODEV) {
+ dev_err(&pdev->dev, "invalid OPP table in device tree\n");
+ return ret;
+ }
+
uport->private_data = drv;
platform_set_drvdata(pdev, port);
port->handle_rx = console ? handle_rx_console : handle_rx_uart;
ret = uart_add_one_port(drv, uport);
if (ret)
- return ret;
+ goto err;
irq_set_status_flags(uport->irq, IRQ_NOAUTOEN);
ret = devm_request_irq(uport->dev, uport->irq, qcom_geni_serial_isr,
@@ -1332,7 +1348,7 @@ static int qcom_geni_serial_probe(struct platform_device *pdev)
if (ret) {
dev_err(uport->dev, "Failed to get IRQ ret %d\n", ret);
uart_remove_one_port(drv, uport);
- return ret;
+ goto err;
}
/*
@@ -1349,11 +1365,16 @@ static int qcom_geni_serial_probe(struct platform_device *pdev)
if (ret) {
device_init_wakeup(&pdev->dev, false);
uart_remove_one_port(drv, uport);
- return ret;
+ goto err;
}
}
return 0;
+err:
+ if (port->se.has_opp_table)
+ dev_pm_opp_of_remove_table(&pdev->dev);
+ dev_pm_opp_put_clkname(port->se.opp_table);
+ return ret;
}
static int qcom_geni_serial_remove(struct platform_device *pdev)
@@ -1361,6 +1382,9 @@ static int qcom_geni_serial_remove(struct platform_device *pdev)
struct qcom_geni_serial_port *port = platform_get_drvdata(pdev);
struct uart_driver *drv = port->uport.private_data;
+ if (port->se.has_opp_table)
+ dev_pm_opp_of_remove_table(&pdev->dev);
+ dev_pm_opp_put_clkname(port->se.opp_table);
dev_pm_clear_wake_irq(&pdev->dev);
device_init_wakeup(&pdev->dev, false);
uart_remove_one_port(drv, &port->uport);