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spi: imx: enable runtime pm support
Enable runtime pm support for spi-imx driver. Signed-off-by: Clark Wang <xiaoning.wang@nxp.com> Link: https://lore.kernel.org/r/20200727063354.17031-1-xiaoning.wang@nxp.com Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
parent
30962fe33a
commit
525c9e5a32
1 changed files with 90 additions and 35 deletions
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@ -13,7 +13,9 @@
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#include <linux/irq.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/pinctrl/consumer.h>
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#include <linux/platform_device.h>
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#include <linux/pm_runtime.h>
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#include <linux/slab.h>
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#include <linux/spi/spi.h>
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#include <linux/spi/spi_bitbang.h>
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@ -30,6 +32,8 @@ static bool use_dma = true;
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module_param(use_dma, bool, 0644);
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MODULE_PARM_DESC(use_dma, "Enable usage of DMA when available (default)");
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#define MXC_RPM_TIMEOUT 2000 /* 2000ms */
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#define MXC_CSPIRXDATA 0x00
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#define MXC_CSPITXDATA 0x04
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#define MXC_CSPICTRL 0x08
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@ -1530,20 +1534,16 @@ spi_imx_prepare_message(struct spi_master *master, struct spi_message *msg)
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struct spi_imx_data *spi_imx = spi_master_get_devdata(master);
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int ret;
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ret = clk_enable(spi_imx->clk_per);
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if (ret)
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return ret;
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ret = clk_enable(spi_imx->clk_ipg);
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if (ret) {
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clk_disable(spi_imx->clk_per);
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ret = pm_runtime_get_sync(spi_imx->dev);
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if (ret < 0) {
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dev_err(spi_imx->dev, "failed to enable clock\n");
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return ret;
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}
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ret = spi_imx->devtype_data->prepare_message(spi_imx, msg);
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if (ret) {
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clk_disable(spi_imx->clk_ipg);
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clk_disable(spi_imx->clk_per);
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pm_runtime_mark_last_busy(spi_imx->dev);
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pm_runtime_put_autosuspend(spi_imx->dev);
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}
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return ret;
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@ -1554,8 +1554,8 @@ spi_imx_unprepare_message(struct spi_master *master, struct spi_message *msg)
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{
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struct spi_imx_data *spi_imx = spi_master_get_devdata(master);
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clk_disable(spi_imx->clk_ipg);
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clk_disable(spi_imx->clk_per);
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pm_runtime_mark_last_busy(spi_imx->dev);
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pm_runtime_put_autosuspend(spi_imx->dev);
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return 0;
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}
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@ -1674,13 +1674,15 @@ static int spi_imx_probe(struct platform_device *pdev)
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goto out_master_put;
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}
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ret = clk_prepare_enable(spi_imx->clk_per);
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if (ret)
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goto out_master_put;
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pm_runtime_enable(spi_imx->dev);
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pm_runtime_set_autosuspend_delay(spi_imx->dev, MXC_RPM_TIMEOUT);
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pm_runtime_use_autosuspend(spi_imx->dev);
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ret = clk_prepare_enable(spi_imx->clk_ipg);
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if (ret)
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goto out_put_per;
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ret = pm_runtime_get_sync(spi_imx->dev);
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if (ret < 0) {
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dev_err(spi_imx->dev, "failed to enable clock\n");
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goto out_runtime_pm_put;
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}
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spi_imx->spi_clk = clk_get_rate(spi_imx->clk_per);
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/*
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@ -1690,7 +1692,7 @@ static int spi_imx_probe(struct platform_device *pdev)
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if (spi_imx->devtype_data->has_dmamode) {
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ret = spi_imx_sdma_init(&pdev->dev, spi_imx, master);
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if (ret == -EPROBE_DEFER)
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goto out_clk_put;
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goto out_runtime_pm_put;
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if (ret < 0)
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dev_err(&pdev->dev, "dma setup error %d, use pio\n",
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@ -1705,19 +1707,20 @@ static int spi_imx_probe(struct platform_device *pdev)
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ret = spi_bitbang_start(&spi_imx->bitbang);
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if (ret) {
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dev_err(&pdev->dev, "bitbang start failed with %d\n", ret);
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goto out_clk_put;
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goto out_runtime_pm_put;
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}
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dev_info(&pdev->dev, "probed\n");
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clk_disable(spi_imx->clk_ipg);
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clk_disable(spi_imx->clk_per);
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pm_runtime_mark_last_busy(spi_imx->dev);
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pm_runtime_put_autosuspend(spi_imx->dev);
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return ret;
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out_clk_put:
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clk_disable_unprepare(spi_imx->clk_ipg);
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out_put_per:
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clk_disable_unprepare(spi_imx->clk_per);
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out_runtime_pm_put:
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pm_runtime_dont_use_autosuspend(spi_imx->dev);
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pm_runtime_put_sync(spi_imx->dev);
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pm_runtime_disable(spi_imx->dev);
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out_master_put:
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spi_master_put(master);
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@ -1732,30 +1735,82 @@ static int spi_imx_remove(struct platform_device *pdev)
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spi_bitbang_stop(&spi_imx->bitbang);
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ret = clk_enable(spi_imx->clk_per);
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if (ret)
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return ret;
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ret = clk_enable(spi_imx->clk_ipg);
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if (ret) {
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clk_disable(spi_imx->clk_per);
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ret = pm_runtime_get_sync(spi_imx->dev);
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if (ret < 0) {
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dev_err(spi_imx->dev, "failed to enable clock\n");
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return ret;
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}
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writel(0, spi_imx->base + MXC_CSPICTRL);
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clk_disable_unprepare(spi_imx->clk_ipg);
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clk_disable_unprepare(spi_imx->clk_per);
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pm_runtime_dont_use_autosuspend(spi_imx->dev);
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pm_runtime_put_sync(spi_imx->dev);
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pm_runtime_disable(spi_imx->dev);
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spi_imx_sdma_exit(spi_imx);
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spi_master_put(master);
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return 0;
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}
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static int __maybe_unused spi_imx_runtime_resume(struct device *dev)
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{
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struct spi_master *master = dev_get_drvdata(dev);
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struct spi_imx_data *spi_imx;
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int ret;
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spi_imx = spi_master_get_devdata(master);
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ret = clk_prepare_enable(spi_imx->clk_per);
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if (ret)
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return ret;
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ret = clk_prepare_enable(spi_imx->clk_ipg);
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if (ret) {
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clk_disable_unprepare(spi_imx->clk_per);
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return ret;
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}
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return 0;
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}
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static int __maybe_unused spi_imx_runtime_suspend(struct device *dev)
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{
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struct spi_master *master = dev_get_drvdata(dev);
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struct spi_imx_data *spi_imx;
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spi_imx = spi_master_get_devdata(master);
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clk_disable_unprepare(spi_imx->clk_per);
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clk_disable_unprepare(spi_imx->clk_ipg);
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return 0;
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}
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static int __maybe_unused spi_imx_suspend(struct device *dev)
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{
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pinctrl_pm_select_sleep_state(dev);
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return 0;
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}
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static int __maybe_unused spi_imx_resume(struct device *dev)
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{
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pinctrl_pm_select_default_state(dev);
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return 0;
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}
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static const struct dev_pm_ops imx_spi_pm = {
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SET_RUNTIME_PM_OPS(spi_imx_runtime_suspend,
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spi_imx_runtime_resume, NULL)
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SET_SYSTEM_SLEEP_PM_OPS(spi_imx_suspend, spi_imx_resume)
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};
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static struct platform_driver spi_imx_driver = {
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.driver = {
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.name = DRIVER_NAME,
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.of_match_table = spi_imx_dt_ids,
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},
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.pm = &imx_spi_pm,
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},
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.id_table = spi_imx_devtype,
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.probe = spi_imx_probe,
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.remove = spi_imx_remove,
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