From 69b80659a728b99b868518b975d00f25ea70ec21 Mon Sep 17 00:00:00 2001 From: Paul Kocialkowski Date: Fri, 26 Aug 2022 20:32:03 +0200 Subject: media: sun6i-csi: Use runtime pm for clocks and reset Wrap the clock and reset preparation into runtime pm functions for better organization of the code. Also fix the clock and reset enable order to first deassert reset, as recommended in Allwinner literature. Make the driver depend on PM while at it since runtime pm is mandatory for the driver to work. Signed-off-by: Paul Kocialkowski Reviewed-by: Jernej Skrabec Signed-off-by: Hans Verkuil Signed-off-by: Mauro Carvalho Chehab --- drivers/media/platform/sunxi/sun6i-csi/Kconfig | 2 +- drivers/media/platform/sunxi/sun6i-csi/sun6i_csi.c | 84 +++++++++++++++------- 2 files changed, 60 insertions(+), 26 deletions(-) (limited to 'drivers/media') diff --git a/drivers/media/platform/sunxi/sun6i-csi/Kconfig b/drivers/media/platform/sunxi/sun6i-csi/Kconfig index e5b6991ce7f0..a472f46648af 100644 --- a/drivers/media/platform/sunxi/sun6i-csi/Kconfig +++ b/drivers/media/platform/sunxi/sun6i-csi/Kconfig @@ -2,7 +2,7 @@ config VIDEO_SUN6I_CSI tristate "Allwinner V3s Camera Sensor Interface driver" depends on V4L_PLATFORM_DRIVERS - depends on VIDEO_DEV && COMMON_CLK && RESET_CONTROLLER && HAS_DMA + depends on VIDEO_DEV && COMMON_CLK && RESET_CONTROLLER && HAS_DMA && PM depends on ARCH_SUNXI || COMPILE_TEST select MEDIA_CONTROLLER select VIDEO_V4L2_SUBDEV_API diff --git a/drivers/media/platform/sunxi/sun6i-csi/sun6i_csi.c b/drivers/media/platform/sunxi/sun6i-csi/sun6i_csi.c index 800851f4e18c..31374d45eb9f 100644 --- a/drivers/media/platform/sunxi/sun6i-csi/sun6i_csi.c +++ b/drivers/media/platform/sunxi/sun6i-csi/sun6i_csi.c @@ -152,40 +152,18 @@ int sun6i_csi_set_power(struct sun6i_csi_device *csi_dev, bool enable) if (!enable) { regmap_update_bits(regmap, CSI_EN_REG, CSI_EN_CSI_EN, 0); + pm_runtime_put(dev); - clk_disable_unprepare(csi_dev->clock_ram); - clk_disable_unprepare(csi_dev->clock_mod); - reset_control_assert(csi_dev->reset); return 0; } - ret = clk_prepare_enable(csi_dev->clock_mod); - if (ret) { - dev_err(csi_dev->dev, "Enable csi clk err %d\n", ret); + ret = pm_runtime_resume_and_get(dev); + if (ret < 0) return ret; - } - - ret = clk_prepare_enable(csi_dev->clock_ram); - if (ret) { - dev_err(csi_dev->dev, "Enable clk_dram_csi clk err %d\n", ret); - goto clk_mod_disable; - } - - ret = reset_control_deassert(csi_dev->reset); - if (ret) { - dev_err(csi_dev->dev, "reset err %d\n", ret); - goto clk_ram_disable; - } regmap_update_bits(regmap, CSI_EN_REG, CSI_EN_CSI_EN, CSI_EN_CSI_EN); return 0; - -clk_ram_disable: - clk_disable_unprepare(csi_dev->clock_ram); -clk_mod_disable: - clk_disable_unprepare(csi_dev->clock_mod); - return ret; } static enum csi_input_fmt get_csi_input_format(struct sun6i_csi_device *csi_dev, @@ -797,6 +775,56 @@ static irqreturn_t sun6i_csi_interrupt(int irq, void *private) return IRQ_HANDLED; } +static int sun6i_csi_suspend(struct device *dev) +{ + struct sun6i_csi_device *csi_dev = dev_get_drvdata(dev); + + reset_control_assert(csi_dev->reset); + clk_disable_unprepare(csi_dev->clock_ram); + clk_disable_unprepare(csi_dev->clock_mod); + + return 0; +} + +static int sun6i_csi_resume(struct device *dev) +{ + struct sun6i_csi_device *csi_dev = dev_get_drvdata(dev); + int ret; + + ret = reset_control_deassert(csi_dev->reset); + if (ret) { + dev_err(dev, "failed to deassert reset\n"); + return ret; + } + + ret = clk_prepare_enable(csi_dev->clock_mod); + if (ret) { + dev_err(dev, "failed to enable module clock\n"); + goto error_reset; + } + + ret = clk_prepare_enable(csi_dev->clock_ram); + if (ret) { + dev_err(dev, "failed to enable ram clock\n"); + goto error_clock_mod; + } + + return 0; + +error_clock_mod: + clk_disable_unprepare(csi_dev->clock_mod); + +error_reset: + reset_control_assert(csi_dev->reset); + + return ret; +} + +static const struct dev_pm_ops sun6i_csi_pm_ops = { + .runtime_suspend = sun6i_csi_suspend, + .runtime_resume = sun6i_csi_resume, +}; + static const struct regmap_config sun6i_csi_regmap_config = { .reg_bits = 32, .reg_stride = 4, @@ -876,6 +904,10 @@ static int sun6i_csi_resources_setup(struct sun6i_csi_device *csi_dev, goto error_clock_rate_exclusive; } + /* Runtime PM */ + + pm_runtime_enable(dev); + return 0; error_clock_rate_exclusive: @@ -886,6 +918,7 @@ error_clock_rate_exclusive: static void sun6i_csi_resources_cleanup(struct sun6i_csi_device *csi_dev) { + pm_runtime_disable(csi_dev->dev); clk_rate_exclusive_put(csi_dev->clock_mod); } @@ -968,6 +1001,7 @@ static struct platform_driver sun6i_csi_platform_driver = { .driver = { .name = SUN6I_CSI_NAME, .of_match_table = of_match_ptr(sun6i_csi_of_match), + .pm = &sun6i_csi_pm_ops, }, }; -- cgit v1.2.3-59-g8ed1b