[v7,8/8] drm/rockchip: Add dmc notifier in vop driver
diff mbox

Message ID 1471836984-6316-9-git-send-email-hl@rock-chips.com
State New
Headers show

Commit Message

huang lin Aug. 22, 2016, 3:36 a.m. UTC
when in ddr frequency scaling process, vop can not do enable or
disable operation, since in dcf we check vop clock to see whether
vop work. If vop work, dcf do ddr frequency scaling when vop
in vblank status, and we need to read vop register to check whether
vop go into vblank status. If vop not work, dcf can do ddr frequency
any time. So when do ddr frequency scaling, you disabled or enable
vop, there may two bad thing happen: 1, the panel flicker(when vop from
disable status change to enable). 2, kernel hang (when vop from enable
status change to disable, dcf need to read vblank status, but if you disable
vop clock, it can not get the status, it will lead soc dead) So we need
register to devfreq notifier, and we can get the dmc status. Also, when
there have two vop enabled, we need to disable dmc, since dcf only base
on one vop vblank time, so the other panel will flicker when do ddr
frequency scaling.

Signed-off-by: Lin Huang <hl@rock-chips.com>
Reviewed-by: Chanwoo Choi <cw00.choi@samsung.com>
---
Changes in v7:
- None

Changes in v6:
- fix a build error

Changes in v5:
- improve some nits

Changes in v4:
- register notifier to devfreq_register_notifier
- use DEVFREQ_PRECHANGE and DEVFREQ_POSTCHANGE to get dmc status
- when two vop enable, disable dmc
- when two vop back to one vop, enable dmc

Changes in v3:
- when do vop eanble/disable, dmc will wait until it finish

Changes in v2:
- None

Changes in v1:
- use wait_event instead usleep

 drivers/gpu/drm/rockchip/rockchip_drm_vop.c | 127 ++++++++++++++++++++++++++--
 1 file changed, 122 insertions(+), 5 deletions(-)

Comments

kernel test robot Aug. 28, 2016, 3:03 a.m. UTC | #1
Hi Lin,

[auto build test ERROR on rockchip/for-next]
[cannot apply to v4.8-rc3 next-20160825]
[if your patch is applied to the wrong git tree, please drop us a note to help improve the system]
[Suggest to use git(>=2.9.0) format-patch --base=<commit> (or --base=auto for convenience) to record what (public, well-known) commit your patch series was built on]
[Check https://git-scm.com/docs/git-format-patch for more information]

url:    https://github.com/0day-ci/linux/commits/Lin-Huang/rk3399-support-ddr-frequency-scaling/20160822-114057
base:   https://git.kernel.org/pub/scm/linux/kernel/git/mmind/linux-rockchip.git for-next
config: arm-defconfig (attached as .config)
compiler: arm-linux-gnueabi-gcc (Debian 5.4.0-6) 5.4.0 20160609
reproduce:
        wget https://git.kernel.org/cgit/linux/kernel/git/wfg/lkp-tests.git/plain/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # save the attached .config to linux build tree
        make.cross ARCH=arm 

All errors (new ones prefixed by >>):

   In file included from drivers/gpu/drm/rockchip/rockchip_drm_vop.c:16:0:
>> include/linux/devfreq-event.h:190:21: error: redefinition of 'devfreq_event_get_drvdata'
    static inline void *devfreq_event_get_drvdata(struct devfreq_event_dev *edev)
                        ^
   include/linux/devfreq-event.h:151:21: note: previous definition of 'devfreq_event_get_drvdata' was here
    static inline void *devfreq_event_get_drvdata(struct devfreq_event_dev *edev)
                        ^

vim +/devfreq_event_get_drvdata +190 include/linux/devfreq-event.h

f262f28c Chanwoo Choi 2015-01-26  184  
f262f28c Chanwoo Choi 2015-01-26  185  static inline void devm_devfreq_event_remove_edev(struct device *dev,
f262f28c Chanwoo Choi 2015-01-26  186  					struct devfreq_event_dev *edev)
f262f28c Chanwoo Choi 2015-01-26  187  {
f262f28c Chanwoo Choi 2015-01-26  188  }
f262f28c Chanwoo Choi 2015-01-26  189  
f262f28c Chanwoo Choi 2015-01-26 @190  static inline void *devfreq_event_get_drvdata(struct devfreq_event_dev *edev)
f262f28c Chanwoo Choi 2015-01-26  191  {
f262f28c Chanwoo Choi 2015-01-26  192  	return NULL;
f262f28c Chanwoo Choi 2015-01-26  193  }

:::::: The code at line 190 was first introduced by commit
:::::: f262f28c147051e7aa6daaf4fb5996833ffadff4 PM / devfreq: event: Add devfreq_event class

:::::: TO: Chanwoo Choi <cw00.choi@samsung.com>
:::::: CC: MyungJoo Ham <myungjoo.ham@samsung.com>

---
0-DAY kernel test infrastructure                Open Source Technology Center
https://lists.01.org/pipermail/kbuild-all                   Intel Corporation

Patch
diff mbox

diff --git a/drivers/gpu/drm/rockchip/rockchip_drm_vop.c b/drivers/gpu/drm/rockchip/rockchip_drm_vop.c
index ec8ad00..a76e70c 100644
--- a/drivers/gpu/drm/rockchip/rockchip_drm_vop.c
+++ b/drivers/gpu/drm/rockchip/rockchip_drm_vop.c
@@ -12,6 +12,8 @@ 
  * GNU General Public License for more details.
  */
 
+#include <linux/devfreq.h>
+#include <linux/devfreq-event.h>
 #include <drm/drm.h>
 #include <drm/drmP.h>
 #include <drm/drm_atomic.h>
@@ -118,6 +120,13 @@  struct vop {
 
 	const struct vop_data *data;
 
+	struct devfreq *devfreq;
+	struct devfreq_event_dev *devfreq_event_dev;
+	struct notifier_block dmc_nb;
+	int dmc_in_process;
+	int vop_switch_status;
+	wait_queue_head_t wait_dmc_queue;
+	wait_queue_head_t wait_vop_switch_queue;
 	uint32_t *regsbak;
 	void __iomem *regs;
 
@@ -428,21 +437,59 @@  static void vop_dsp_hold_valid_irq_disable(struct vop *vop)
 	spin_unlock_irqrestore(&vop->irq_lock, flags);
 }
 
+static int dmc_notify(struct notifier_block *nb, unsigned long event,
+		      void *data)
+{
+	struct vop *vop = container_of(nb, struct vop, dmc_nb);
+
+	if (event == DEVFREQ_PRECHANGE) {
+		/*
+		 * check if vop in enable or disable process,
+		 * if yes, wait until it finishes, use 200ms as
+		 * timeout.
+		 */
+		if (!wait_event_timeout(vop->wait_vop_switch_queue,
+					!vop->vop_switch_status, HZ / 5))
+			dev_warn(vop->dev,
+				 "Timeout waiting for vop swtich status\n");
+		vop->dmc_in_process = 1;
+	} else if (event == DEVFREQ_POSTCHANGE) {
+		vop->dmc_in_process = 0;
+		wake_up(&vop->wait_dmc_queue);
+	}
+
+	return NOTIFY_OK;
+}
+
 static void vop_enable(struct drm_crtc *crtc)
 {
 	struct vop *vop = to_vop(crtc);
+	int num_enabled_crtc = 0;
 	int ret;
 
+	if (vop->is_enabled)
+		return;
+
+	/*
+	 * if in dmc scaling frequency process, wait until it finishes
+	 * use 100ms as timeout time.
+	 */
+	if (!wait_event_timeout(vop->wait_dmc_queue,
+				!vop->dmc_in_process, HZ / 5))
+		dev_warn(vop->dev,
+			 "Timeout waiting for dmc when vop enable\n");
+
+	vop->vop_switch_status = 1;
 	ret = pm_runtime_get_sync(vop->dev);
 	if (ret < 0) {
 		dev_err(vop->dev, "failed to get pm runtime: %d\n", ret);
-		return;
+		goto err;
 	}
 
 	ret = clk_enable(vop->hclk);
 	if (ret < 0) {
 		dev_err(vop->dev, "failed to enable hclk - %d\n", ret);
-		return;
+		goto err;
 	}
 
 	ret = clk_enable(vop->dclk);
@@ -456,7 +503,6 @@  static void vop_enable(struct drm_crtc *crtc)
 		dev_err(vop->dev, "failed to enable aclk - %d\n", ret);
 		goto err_disable_dclk;
 	}
-
 	/*
 	 * Slave iommu shares power, irq and clock with vop.  It was associated
 	 * automatically with this master device via common driver code.
@@ -485,6 +531,21 @@  static void vop_enable(struct drm_crtc *crtc)
 
 	drm_crtc_vblank_on(crtc);
 
+	vop->vop_switch_status = 0;
+	wake_up(&vop->wait_vop_switch_queue);
+
+	/* check how many vop we use now */
+	drm_for_each_crtc(crtc, vop->drm_dev) {
+		if (crtc->state->enable)
+			num_enabled_crtc++;
+	}
+
+	/* if enable two vop, need to disable dmc */
+	if ((num_enabled_crtc > 1) && vop->devfreq) {
+		if (vop->devfreq_event_dev)
+			devfreq_event_disable_edev(vop->devfreq_event_dev);
+		devfreq_suspend_device(vop->devfreq);
+	}
 	return;
 
 err_disable_aclk:
@@ -493,16 +554,32 @@  err_disable_dclk:
 	clk_disable(vop->dclk);
 err_disable_hclk:
 	clk_disable(vop->hclk);
+err:
+	vop->vop_switch_status = 0;
+	wake_up(&vop->wait_vop_switch_queue);
+	return;
 }
 
 static void vop_crtc_disable(struct drm_crtc *crtc)
 {
 	struct vop *vop = to_vop(crtc);
+	int num_enabled_crtc = 0;
 	int i;
 
 	WARN_ON(vop->event);
 
 	/*
+	 * if in dmc scaling frequency process, wait until it finish
+	 * use 100ms as timeout time.
+	 */
+	if (!wait_event_timeout(vop->wait_dmc_queue,
+				!vop->dmc_in_process, HZ / 5))
+		dev_warn(vop->dev,
+			 "Timeout waiting for dmc when vop disable\n");
+
+	vop->vop_switch_status = 1;
+
+	/*
 	 * We need to make sure that all windows are disabled before we
 	 * disable that crtc. Otherwise we might try to scan from a destroyed
 	 * buffer later.
@@ -515,7 +592,6 @@  static void vop_crtc_disable(struct drm_crtc *crtc)
 		VOP_WIN_SET(vop, win, enable, 0);
 		spin_unlock(&vop->reg_lock);
 	}
-
 	drm_crtc_vblank_off(crtc);
 
 	/*
@@ -546,7 +622,6 @@  static void vop_crtc_disable(struct drm_crtc *crtc)
 	 * vop standby complete, so iommu detach is safe.
 	 */
 	rockchip_drm_dma_detach_device(vop->drm_dev, vop->dev);
-
 	clk_disable(vop->dclk);
 	clk_disable(vop->aclk);
 	clk_disable(vop->hclk);
@@ -559,6 +634,25 @@  static void vop_crtc_disable(struct drm_crtc *crtc)
 
 		crtc->state->event = NULL;
 	}
+
+	vop->vop_switch_status = 0;
+	wake_up(&vop->wait_vop_switch_queue);
+
+	/* check how many vop use now */
+	drm_for_each_crtc(crtc, vop->drm_dev) {
+		if (crtc->state->enable)
+			num_enabled_crtc++;
+	}
+
+	/*
+	 * if num_enabled_crtc = 1 now, it means 2 vop enabled
+	 * change to 1 vop enabled  need to enable dmc again.
+	 */
+	if ((num_enabled_crtc == 1) && vop->devfreq) {
+		if (vop->devfreq_event_dev)
+			devfreq_event_enable_edev(vop->devfreq_event_dev);
+		devfreq_resume_device(vop->devfreq);
+	}
 }
 
 static void vop_plane_destroy(struct drm_plane *plane)
@@ -1410,6 +1504,8 @@  static int vop_bind(struct device *dev, struct device *master, void *data)
 	struct drm_device *drm_dev = data;
 	struct vop *vop;
 	struct resource *res;
+	struct devfreq *devfreq;
+	struct devfreq_event_dev *event_dev;
 	size_t alloc_size;
 	int ret, irq;
 
@@ -1471,6 +1567,27 @@  static int vop_bind(struct device *dev, struct device *master, void *data)
 		return ret;
 
 	pm_runtime_enable(&pdev->dev);
+
+	init_waitqueue_head(&vop->wait_vop_switch_queue);
+	vop->vop_switch_status = 0;
+	init_waitqueue_head(&vop->wait_dmc_queue);
+	vop->dmc_in_process = 0;
+
+	devfreq = devfreq_get_devfreq_by_phandle(dev, 0);
+	if (IS_ERR(devfreq))
+		goto out;
+
+	vop->devfreq = devfreq;
+	vop->dmc_nb.notifier_call = dmc_notify;
+	devfreq_register_notifier(vop->devfreq, &vop->dmc_nb,
+				  DEVFREQ_TRANSITION_NOTIFIER);
+
+	event_dev = devfreq_event_get_edev_by_phandle(vop->devfreq->dev.parent,
+						      0);
+	if (IS_ERR(event_dev))
+		goto out;
+	vop->devfreq_event_dev = event_dev;
+out:
 	return 0;
 }