The current clock handling in the LCDIF driver is a convoluted mess. Implement runtime PM ops which turn the clock ON and OFF and let the pm_runtime_get_sync()/pm_runtime_put_sync() calls in .atomic_enable and .atomic_disable callbacks turn the clock ON and OFF at the right time.
This requires slight reordering in mxsfb_crtc_atomic_enable() and mxsfb_crtc_atomic_disable(), since all the register accesses must happen only with clock enabled and clock frequency configuration must happen with clock disabled.
Signed-off-by: Marek Vasut marex@denx.de Cc: Alexander Stein alexander.stein@ew.tq-group.com Cc: Laurent Pinchart laurent.pinchart@ideasonboard.com Cc: Lucas Stach l.stach@pengutronix.de Cc: Peng Fan peng.fan@nxp.com Cc: Robby Cai robby.cai@nxp.com Cc: Sam Ravnborg sam@ravnborg.org Cc: Stefan Agner stefan@agner.ch --- drivers/gpu/drm/mxsfb/mxsfb_drv.c | 100 +++++++++++++++++------------- drivers/gpu/drm/mxsfb/mxsfb_kms.c | 27 +++----- 2 files changed, 66 insertions(+), 61 deletions(-)
diff --git a/drivers/gpu/drm/mxsfb/mxsfb_drv.c b/drivers/gpu/drm/mxsfb/mxsfb_drv.c index 375f26d4a4172..bb15e32d8a014 100644 --- a/drivers/gpu/drm/mxsfb/mxsfb_drv.c +++ b/drivers/gpu/drm/mxsfb/mxsfb_drv.c @@ -72,18 +72,6 @@ static const struct mxsfb_devdata mxsfb_devdata[] = { }, };
-void mxsfb_enable_axi_clk(struct mxsfb_drm_private *mxsfb) -{ - if (mxsfb->clk_axi) - clk_prepare_enable(mxsfb->clk_axi); -} - -void mxsfb_disable_axi_clk(struct mxsfb_drm_private *mxsfb) -{ - if (mxsfb->clk_axi) - clk_disable_unprepare(mxsfb->clk_axi); -} - static struct drm_framebuffer * mxsfb_fb_create(struct drm_device *dev, struct drm_file *file_priv, const struct drm_mode_fb_cmd2 *mode_cmd) @@ -172,13 +160,9 @@ static void mxsfb_irq_disable(struct drm_device *drm) { struct mxsfb_drm_private *mxsfb = drm->dev_private;
- mxsfb_enable_axi_clk(mxsfb); - /* Disable and clear VBLANK IRQ */ writel(CTRL1_CUR_FRAME_DONE_IRQ_EN, mxsfb->base + LCDC_CTRL1 + REG_CLR); writel(CTRL1_CUR_FRAME_DONE_IRQ, mxsfb->base + LCDC_CTRL1 + REG_CLR); - - mxsfb_disable_axi_clk(mxsfb); }
static int mxsfb_irq_install(struct drm_device *dev, int irq) @@ -224,33 +208,33 @@ static int mxsfb_load(struct drm_device *drm, if (IS_ERR(mxsfb->clk)) return PTR_ERR(mxsfb->clk);
- mxsfb->clk_axi = devm_clk_get(drm->dev, "axi"); + mxsfb->clk_axi = devm_clk_get_optional(drm->dev, "axi"); if (IS_ERR(mxsfb->clk_axi)) - mxsfb->clk_axi = NULL; + return PTR_ERR(mxsfb->clk_axi);
- mxsfb->clk_disp_axi = devm_clk_get(drm->dev, "disp_axi"); + mxsfb->clk_disp_axi = devm_clk_get_optional(drm->dev, "disp_axi"); if (IS_ERR(mxsfb->clk_disp_axi)) - mxsfb->clk_disp_axi = NULL; + return PTR_ERR(mxsfb->clk_disp_axi); + + platform_set_drvdata(pdev, drm);
ret = dma_set_mask_and_coherent(drm->dev, DMA_BIT_MASK(32)); if (ret) return ret;
- pm_runtime_enable(drm->dev); - /* Modeset init */ drm_mode_config_init(drm);
ret = mxsfb_kms_init(mxsfb); if (ret < 0) { dev_err(drm->dev, "Failed to initialize KMS pipeline\n"); - goto err_vblank; + return ret; }
ret = drm_vblank_init(drm, drm->mode_config.num_crtc); if (ret < 0) { dev_err(drm->dev, "Failed to initialise vblank\n"); - goto err_vblank; + return ret; }
/* Start with vertical blanking interrupt reporting disabled. */ @@ -260,7 +244,7 @@ static int mxsfb_load(struct drm_device *drm, if (ret) { if (ret != -EPROBE_DEFER) dev_err(drm->dev, "Cannot connect bridge: %d\n", ret); - goto err_vblank; + return ret; }
drm->mode_config.min_width = MXSFB_MIN_XRES; @@ -274,44 +258,37 @@ static int mxsfb_load(struct drm_device *drm,
ret = platform_get_irq(pdev, 0); if (ret < 0) - goto err_vblank; + return ret; mxsfb->irq = ret;
- pm_runtime_get_sync(drm->dev); ret = mxsfb_irq_install(drm, mxsfb->irq); - pm_runtime_put_sync(drm->dev); - if (ret < 0) { dev_err(drm->dev, "Failed to install IRQ handler\n"); - goto err_vblank; + return ret; }
drm_kms_helper_poll_init(drm);
- platform_set_drvdata(pdev, drm); - drm_helper_hpd_irq_event(drm);
- return 0; - -err_vblank: - pm_runtime_disable(drm->dev); + pm_runtime_enable(drm->dev);
- return ret; + return 0; }
static void mxsfb_unload(struct drm_device *drm) { + pm_runtime_get_sync(drm->dev); + drm_kms_helper_poll_fini(drm); drm_mode_config_cleanup(drm);
- pm_runtime_get_sync(drm->dev); mxsfb_irq_uninstall(drm); + pm_runtime_put_sync(drm->dev); + pm_runtime_disable(drm->dev);
drm->dev_private = NULL; - - pm_runtime_disable(drm->dev); }
DEFINE_DRM_GEM_CMA_FOPS(fops); @@ -388,23 +365,60 @@ static void mxsfb_shutdown(struct platform_device *pdev) drm_atomic_helper_shutdown(drm); }
-#ifdef CONFIG_PM_SLEEP +static int mxsfb_rpm_suspend(struct device *dev) +{ + struct drm_device *drm = dev_get_drvdata(dev); + struct mxsfb_drm_private *mxsfb = drm->dev_private; + + /* These clock supply the DISPLAY CLOCK Domain */ + clk_disable_unprepare(mxsfb->clk); + /* These clock supply the System Bus, AXI, Write Path, LFIFO */ + clk_disable_unprepare(mxsfb->clk_disp_axi); + /* These clock supply the Control Bus, APB, APBH Ctrl Registers */ + clk_disable_unprepare(mxsfb->clk_axi); + + return 0; +} + +static int mxsfb_rpm_resume(struct device *dev) +{ + struct drm_device *drm = dev_get_drvdata(dev); + struct mxsfb_drm_private *mxsfb = drm->dev_private; + + /* These clock supply the Control Bus, APB, APBH Ctrl Registers */ + clk_prepare_enable(mxsfb->clk_axi); + /* These clock supply the System Bus, AXI, Write Path, LFIFO */ + clk_prepare_enable(mxsfb->clk_disp_axi); + /* These clock supply the DISPLAY CLOCK Domain */ + clk_prepare_enable(mxsfb->clk); + + return 0; +} + static int mxsfb_suspend(struct device *dev) { struct drm_device *drm = dev_get_drvdata(dev); + int ret;
- return drm_mode_config_helper_suspend(drm); + ret = drm_mode_config_helper_suspend(drm); + if (ret) + return ret; + + return mxsfb_rpm_suspend(dev); }
static int mxsfb_resume(struct device *dev) { struct drm_device *drm = dev_get_drvdata(dev);
+ mxsfb_rpm_resume(dev); + return drm_mode_config_helper_resume(drm); } -#endif
static const struct dev_pm_ops mxsfb_pm_ops = { + .runtime_suspend = mxsfb_rpm_suspend, + .runtime_resume = mxsfb_rpm_resume, SET_SYSTEM_SLEEP_PM_OPS(mxsfb_suspend, mxsfb_resume) };
diff --git a/drivers/gpu/drm/mxsfb/mxsfb_kms.c b/drivers/gpu/drm/mxsfb/mxsfb_kms.c index 4cfb6c0016799..657b6afbbf1f9 100644 --- a/drivers/gpu/drm/mxsfb/mxsfb_kms.c +++ b/drivers/gpu/drm/mxsfb/mxsfb_kms.c @@ -100,10 +100,6 @@ static void mxsfb_enable_controller(struct mxsfb_drm_private *mxsfb) { u32 reg;
- if (mxsfb->clk_disp_axi) - clk_prepare_enable(mxsfb->clk_disp_axi); - clk_prepare_enable(mxsfb->clk); - /* Increase number of outstanding requests on all supported IPs */ if (mxsfb->devdata->has_ctrl2) { reg = readl(mxsfb->base + LCDC_V4_CTRL2); @@ -168,10 +164,6 @@ static void mxsfb_disable_controller(struct mxsfb_drm_private *mxsfb) reg = readl(mxsfb->base + LCDC_VDCTRL4); reg &= ~VDCTRL4_SYNC_SIGNALS_ON; writel(reg, mxsfb->base + LCDC_VDCTRL4); - - clk_disable_unprepare(mxsfb->clk); - if (mxsfb->clk_disp_axi) - clk_disable_unprepare(mxsfb->clk_disp_axi); }
/* @@ -250,8 +242,6 @@ static void mxsfb_crtc_mode_set_nofb(struct mxsfb_drm_private *mxsfb,
mxsfb_set_formats(mxsfb, bus_format);
- clk_set_rate(mxsfb->clk, m->crtc_clock * 1000); - if (mxsfb->bridge && mxsfb->bridge->timings) bus_flags = mxsfb->bridge->timings->input_bus_flags;
@@ -346,16 +336,12 @@ static void mxsfb_crtc_atomic_enable(struct drm_crtc *crtc, struct drm_atomic_state *state) { struct mxsfb_drm_private *mxsfb = to_mxsfb_drm_private(crtc->dev); + struct drm_display_mode *m = &mxsfb->crtc.state->adjusted_mode; struct drm_bridge_state *bridge_state; struct drm_device *drm = mxsfb->drm; u32 bus_format = 0; dma_addr_t paddr;
- pm_runtime_get_sync(drm->dev); - mxsfb_enable_axi_clk(mxsfb); - - drm_crtc_vblank_on(crtc); - /* If there is a bridge attached to the LCDIF, use its bus format */ if (mxsfb->bridge) { bridge_state = @@ -382,6 +368,10 @@ static void mxsfb_crtc_atomic_enable(struct drm_crtc *crtc, if (!bus_format) bus_format = MEDIA_BUS_FMT_RGB888_1X24;
+ clk_set_rate(mxsfb->clk, m->crtc_clock * 1000); + + pm_runtime_get_sync(drm->dev); + mxsfb_crtc_mode_set_nofb(mxsfb, bus_format);
/* Write cur_buf as well to avoid an initial corrupt frame */ @@ -392,6 +382,8 @@ static void mxsfb_crtc_atomic_enable(struct drm_crtc *crtc, }
mxsfb_enable_controller(mxsfb); + + drm_crtc_vblank_on(crtc); }
static void mxsfb_crtc_atomic_disable(struct drm_crtc *crtc, @@ -401,6 +393,8 @@ static void mxsfb_crtc_atomic_disable(struct drm_crtc *crtc, struct drm_device *drm = mxsfb->drm; struct drm_pending_vblank_event *event;
+ drm_crtc_vblank_off(crtc); + mxsfb_disable_controller(mxsfb);
spin_lock_irq(&drm->event_lock); @@ -411,9 +405,6 @@ static void mxsfb_crtc_atomic_disable(struct drm_crtc *crtc, } spin_unlock_irq(&drm->event_lock);
- drm_crtc_vblank_off(crtc); - - mxsfb_disable_axi_clk(mxsfb); pm_runtime_put_sync(drm->dev); }