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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>
Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Akash Asthana <akashast@codeaurora.org>
Cc: linux-serial@vger.kernel.org
Link: https://lore.kernel.org/r/1592222564-13556-2-git-send-email-rnayak@codeaurora.org
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
This commit is contained in:
Rajendra Nayak 2020-06-15 17:32:39 +05:30 committed by Bjorn Andersson
parent cff80645d6
commit a5819b548a
2 changed files with 29 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

29
drivers/tty/serial/qcom_geni_serial.c
View File

@ -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>
@ -963,7 +964,7 @@ 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;
@ -1383,13 +1384,25 @@ 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,
@ -1397,7 +1410,7 @@ 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;
}
/*
@ -1414,11 +1427,16 @@ 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)
@ -1426,6 +1444,9 @@ 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);

4
include/linux/qcom-geni-se.h
View File

@ -47,6 +47,8 @@ struct geni_icc_path {
* @num_clk_levels: Number of valid clock levels in clk_perf_tbl
* @clk_perf_tbl: Table of clock frequency input to serial engine clock
* @icc_paths: Array of ICC paths for SE
* @opp_table: Pointer to the OPP table
* @has_opp_table: Specifies if the SE has an OPP table
*/
struct geni_se {
void __iomem *base;
@ -56,6 +58,8 @@ struct geni_se {
unsigned int num_clk_levels;
unsigned long *clk_perf_tbl;
struct geni_icc_path icc_paths[3];
struct opp_table *opp_table;
bool has_opp_table;
};
/* Common SE registers */