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Message-ID: <a60f3eb7-137e-346e-7f91-1c27c30cf1b0@xilinx.com>
Date: Fri, 20 Oct 2017 08:33:48 +0200
From: Michal Simek <michal.simek@...inx.com>
To: Michal Simek <michal.simek@...inx.com>,
Kedareswara rao Appana <appana.durga.rao@...inx.com>,
<vinod.koul@...el.com>, <dan.j.williams@...el.com>, <sr@...x.de>,
<linus.walleij@...aro.org>, <dave.jiang@...el.com>
CC: <dmaengine@...r.kernel.org>,
<linux-arm-kernel@...ts.infradead.org>,
<linux-kernel@...r.kernel.org>,
Kedareswara rao Appana <appanad@...inx.com>
Subject: Re: [PATCH] dmaengine: zynqmp_dma: Add runtime pm support
On 20.10.2017 08:31, Michal Simek wrote:
> On 18.10.2017 09:02, Kedareswara rao Appana wrote:
>> This patch adds runtime pm support in the driver.
>>
>> Signed-off-by: Kedareswara rao Appana <appanad@...inx.com>
>> ---
>> drivers/dma/xilinx/zynqmp_dma.c | 167 ++++++++++++++++++++++++++++++++--------
>> 1 file changed, 135 insertions(+), 32 deletions(-)
>>
>> diff --git a/drivers/dma/xilinx/zynqmp_dma.c b/drivers/dma/xilinx/zynqmp_dma.c
>> index 1ee1241..dd73831 100644
>> --- a/drivers/dma/xilinx/zynqmp_dma.c
>> +++ b/drivers/dma/xilinx/zynqmp_dma.c
>> @@ -23,6 +23,7 @@
>> #include <linux/slab.h>
>> #include <linux/clk.h>
>> #include <linux/io-64-nonatomic-lo-hi.h>
>> +#include <linux/pm_runtime.h>
>>
>> #include "../dmaengine.h"
>>
>> @@ -138,6 +139,8 @@
>> #define ZYNQMP_DMA_BUS_WIDTH_64 64
>> #define ZYNQMP_DMA_BUS_WIDTH_128 128
>>
>> +#define ZDMA_PM_TIMEOUT 100
>> +
>> #define ZYNQMP_DMA_DESC_SIZE(chan) (chan->desc_size)
>>
>> #define to_chan(chan) container_of(chan, struct zynqmp_dma_chan, \
>> @@ -211,8 +214,6 @@ struct zynqmp_dma_desc_sw {
>> * @bus_width: Bus width
>> * @src_burst_len: Source burst length
>> * @dst_burst_len: Dest burst length
>> - * @clk_main: Pointer to main clock
>> - * @clk_apb: Pointer to apb clock
>> */
>> struct zynqmp_dma_chan {
>> struct zynqmp_dma_device *zdev;
>> @@ -237,8 +238,6 @@ struct zynqmp_dma_chan {
>> u32 bus_width;
>> u32 src_burst_len;
>> u32 dst_burst_len;
>> - struct clk *clk_main;
>> - struct clk *clk_apb;
>> };
>>
>> /**
>> @@ -246,11 +245,15 @@ struct zynqmp_dma_chan {
>> * @dev: Device Structure
>> * @common: DMA device structure
>> * @chan: Driver specific DMA channel
>> + * @clk_main: Pointer to main clock
>> + * @clk_apb: Pointer to apb clock
>> */
>> struct zynqmp_dma_device {
>> struct device *dev;
>> struct dma_device common;
>> struct zynqmp_dma_chan *chan;
>> + struct clk *clk_main;
>> + struct clk *clk_apb;
>> };
>>
>> static inline void zynqmp_dma_writeq(struct zynqmp_dma_chan *chan, u32 reg,
>> @@ -461,7 +464,11 @@ static int zynqmp_dma_alloc_chan_resources(struct dma_chan *dchan)
>> {
>> struct zynqmp_dma_chan *chan = to_chan(dchan);
>> struct zynqmp_dma_desc_sw *desc;
>> - int i;
>> + int i, ret;
>> +
>> + ret = pm_runtime_get_sync(chan->dev);
>> + if (ret < 0)
>> + return ret;
>>
>> chan->sw_desc_pool = kzalloc(sizeof(*desc) * ZYNQMP_DMA_NUM_DESCS,
>> GFP_KERNEL);
>> @@ -664,6 +671,8 @@ static void zynqmp_dma_free_chan_resources(struct dma_chan *dchan)
>> (2 * ZYNQMP_DMA_DESC_SIZE(chan) * ZYNQMP_DMA_NUM_DESCS),
>> chan->desc_pool_v, chan->desc_pool_p);
>> kfree(chan->sw_desc_pool);
>> + pm_runtime_mark_last_busy(chan->dev);
>> + pm_runtime_put_autosuspend(chan->dev);
>> }
>>
>> /**
>> @@ -841,8 +850,6 @@ static void zynqmp_dma_chan_remove(struct zynqmp_dma_chan *chan)
>> devm_free_irq(chan->zdev->dev, chan->irq, chan);
>> tasklet_kill(&chan->tasklet);
>> list_del(&chan->common.device_node);
>> - clk_disable_unprepare(chan->clk_apb);
>> - clk_disable_unprepare(chan->clk_main);
>> }
>>
>> /**
>> @@ -907,30 +914,6 @@ static int zynqmp_dma_chan_probe(struct zynqmp_dma_device *zdev,
>> "zynqmp-dma", chan);
>> if (err)
>> return err;
>> - chan->clk_main = devm_clk_get(&pdev->dev, "clk_main");
>> - if (IS_ERR(chan->clk_main)) {
>> - dev_err(&pdev->dev, "main clock not found.\n");
>> - return PTR_ERR(chan->clk_main);
>> - }
>> -
>> - chan->clk_apb = devm_clk_get(&pdev->dev, "clk_apb");
>> - if (IS_ERR(chan->clk_apb)) {
>> - dev_err(&pdev->dev, "apb clock not found.\n");
>> - return PTR_ERR(chan->clk_apb);
>> - }
>> -
>> - err = clk_prepare_enable(chan->clk_main);
>> - if (err) {
>> - dev_err(&pdev->dev, "Unable to enable main clock.\n");
>> - return err;
>> - }
>> -
>> - err = clk_prepare_enable(chan->clk_apb);
>> - if (err) {
>> - clk_disable_unprepare(chan->clk_main);
>> - dev_err(&pdev->dev, "Unable to enable apb clock.\n");
>> - return err;
>> - }
>>
>> chan->desc_size = sizeof(struct zynqmp_dma_desc_ll);
>> chan->idle = true;
>> @@ -953,6 +936,87 @@ static struct dma_chan *of_zynqmp_dma_xlate(struct of_phandle_args *dma_spec,
>> }
>>
>> /**
>> + * zynqmp_dma_suspend - Suspend method for the driver
>> + * @dev: Address of the device structure
>> + *
>> + * Put the driver into low power mode.
>> + * Return: 0 on success and failure value on error
>> + */
>> +static int __maybe_unused zynqmp_dma_suspend(struct device *dev)
>> +{
>> + if (!device_may_wakeup(dev))
>> + return pm_runtime_force_suspend(dev);
>> +
>> + return 0;
>> +}
>> +
>> +/**
>> + * zynqmp_dma_resume - Resume from suspend
>> + * @dev: Address of the device structure
>> + *
>> + * Resume operation after suspend.
>> + * Return: 0 on success and failure value on error
>> + */
>> +static int __maybe_unused zynqmp_dma_resume(struct device *dev)
>> +{
>> + if (!device_may_wakeup(dev))
>> + return pm_runtime_force_resume(dev);
>> +
>> + return 0;
>> +}
>> +
>> +/**
>> + * zynqmp_dma_runtime_suspend - Runtime suspend method for the driver
>> + * @dev: Address of the device structure
>> + *
>> + * Put the driver into low power mode.
>> + * Return: 0 always
>> + */
>> +static int __maybe_unused zynqmp_dma_runtime_suspend(struct device *dev)
>> +{
>> + struct zynqmp_dma_device *zdev = dev_get_drvdata(dev);
>> +
>> + clk_disable_unprepare(zdev->clk_main);
>> + clk_disable_unprepare(zdev->clk_apb);
>> +
>> + return 0;
>> +}
>> +
>> +/**
>> + * zynqmp_dma_runtime_resume - Runtime suspend method for the driver
>> + * @dev: Address of the device structure
>> + *
>> + * Put the driver into low power mode.
>> + * Return: 0 always
>> + */
>> +static int __maybe_unused zynqmp_dma_runtime_resume(struct device *dev)
>> +{
>> + struct zynqmp_dma_device *zdev = dev_get_drvdata(dev);
>> + int err;
>> +
>> + err = clk_prepare_enable(zdev->clk_main);
>> + if (err) {
>> + dev_err(dev, "Unable to enable main clock.\n");
>> + return err;
>> + }
>> +
>> + err = clk_prepare_enable(zdev->clk_apb);
>> + if (err) {
>> + dev_err(dev, "Unable to enable apb clock.\n");
>> + clk_disable_unprepare(zdev->clk_main);
>> + return err;
>> + }
>> +
>> + return 0;
>> +}
>> +
>> +static const struct dev_pm_ops zynqmp_dma_dev_pm_ops = {
>> + SET_SYSTEM_SLEEP_PM_OPS(zynqmp_dma_suspend, zynqmp_dma_resume)
>> + SET_RUNTIME_PM_OPS(zynqmp_dma_runtime_suspend,
>> + zynqmp_dma_runtime_resume, NULL)
>> +};
>> +
>> +/**
>> * zynqmp_dma_probe - Driver probe function
>> * @pdev: Pointer to the platform_device structure
>> *
>> @@ -984,12 +1048,39 @@ static int zynqmp_dma_probe(struct platform_device *pdev)
>> p->device_config = zynqmp_dma_device_config;
>> p->dev = &pdev->dev;
>>
>> + zdev->clk_main = devm_clk_get(&pdev->dev, "clk_main");
>> + if (IS_ERR(zdev->clk_main)) {
>> + dev_err(&pdev->dev, "main clock not found.\n");
>> + return PTR_ERR(zdev->clk_main);
>> + }
>> +
>> + zdev->clk_apb = devm_clk_get(&pdev->dev, "clk_apb");
>> + if (IS_ERR(zdev->clk_apb)) {
>> + dev_err(&pdev->dev, "apb clock not found.\n");
>> + return PTR_ERR(zdev->clk_apb);
>> + }
>> +
>> + ret = clk_prepare_enable(zdev->clk_main);
>> + if (ret) {
>> + dev_err(&pdev->dev, "Unable to enable main clock.\n");
>> + return ret;
>> + }
>> +
>> + ret = clk_prepare_enable(zdev->clk_apb);
>> + if (ret) {
>> + dev_err(&pdev->dev, "Unable to enable apb clock.\n");
>> + goto err_disable_clk;
>> + }
>> +
>> platform_set_drvdata(pdev, zdev);
>> + pm_runtime_set_autosuspend_delay(zdev->dev, ZDMA_PM_TIMEOUT);
>> + pm_runtime_use_autosuspend(zdev->dev);
>> + pm_runtime_enable(zdev->dev);
>>
>> ret = zynqmp_dma_chan_probe(zdev, pdev);
>> if (ret) {
>> dev_err(&pdev->dev, "Probing channel failed\n");
>> - goto free_chan_resources;
>> + goto err_disable_pm;
>> }
>>
>> p->dst_addr_widths = BIT(zdev->chan->bus_width / 8);
>> @@ -1005,10 +1096,18 @@ static int zynqmp_dma_probe(struct platform_device *pdev)
>> goto free_chan_resources;
>> }
>>
>> + pm_runtime_mark_last_busy(zdev->dev);
>> + pm_runtime_put_sync_autosuspend(zdev->dev);
>> +
>> dev_info(&pdev->dev, "ZynqMP DMA driver Probe success\n");
>>
>> return 0;
>>
>> +err_disable_clk:
>> + clk_disable_unprepare(zdev->clk_main);
>> +err_disable_pm:
>> + clk_disable_unprepare(zdev->clk_apb);
>> + pm_runtime_disable(zdev->dev);
>> free_chan_resources:
>> zynqmp_dma_chan_remove(zdev->chan);
>> return ret;
>> @@ -1028,6 +1127,9 @@ static int zynqmp_dma_remove(struct platform_device *pdev)
>> dma_async_device_unregister(&zdev->common);
>>
>> zynqmp_dma_chan_remove(zdev->chan);
>> + pm_runtime_disable(zdev->dev);
>> + clk_disable_unprepare(zdev->clk_apb);
>> + clk_disable_unprepare(zdev->clk_main);
>>
>> return 0;
>> }
>> @@ -1042,6 +1144,7 @@ static struct platform_driver zynqmp_dma_driver = {
>> .driver = {
>> .name = "xilinx-zynqmp-dma",
>> .of_match_table = zynqmp_dma_of_match,
>> + .pm = &zynqmp_dma_dev_pm_ops,
>> },
>> .probe = zynqmp_dma_probe,
>> .remove = zynqmp_dma_remove,
>>
>
> CR number?
Please ignore this one - I thought it is coming to our soc vendor tree. :-)
Cheers,
Michal
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