[PATCH] drm: mali-dp: Enable power management for the device.

From: Liviu Dudau
Date: Fri Mar 24 2017 - 10:28:36 EST

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Enable runtime and system Power Management. Clocks are now managed
from malidp_crtc_{enable,disable} functions. Suspend-to-RAM tested
as working on Juno.

Signed-off-by: Liviu Dudau <Liviu.Dudau@xxxxxxx>
Reviewed-by: Brian Starkey <brian.starkey@xxxxxxx>
---
drivers/gpu/drm/arm/malidp_crtc.c | 14 ++++-
drivers/gpu/drm/arm/malidp_drv.c | 128 +++++++++++++++++++++++++++++++-------
drivers/gpu/drm/arm/malidp_drv.h | 1 +
drivers/gpu/drm/arm/malidp_hw.h | 5 ++
4 files changed, 125 insertions(+), 23 deletions(-)

diff --git a/drivers/gpu/drm/arm/malidp_crtc.c b/drivers/gpu/drm/arm/malidp_crtc.c
index f9d665550d3e..fab776c37602 100644
--- a/drivers/gpu/drm/arm/malidp_crtc.c
+++ b/drivers/gpu/drm/arm/malidp_crtc.c
@@ -16,6 +16,7 @@
#include <drm/drm_crtc.h>
#include <drm/drm_crtc_helper.h>
#include <linux/clk.h>
+#include <linux/pm_runtime.h>
#include <video/videomode.h>

#include "malidp_drv.h"
@@ -58,9 +59,14 @@ static void malidp_crtc_enable(struct drm_crtc *crtc)
struct malidp_drm *malidp = crtc_to_malidp_device(crtc);
struct malidp_hw_device *hwdev = malidp->dev;
struct videomode vm;
+ int err = pm_runtime_get_sync(crtc->dev->dev);

- drm_display_mode_to_videomode(&crtc->state->adjusted_mode, &vm);
+ if (err < 0) {
+ DRM_DEBUG_DRIVER("Failed to enable runtime power management: %d\n", err);
+ return;
+ }

+ drm_display_mode_to_videomode(&crtc->state->adjusted_mode, &vm);
clk_prepare_enable(hwdev->pxlclk);

/* We rely on firmware to set mclk to a sensible level. */
@@ -75,10 +81,16 @@ static void malidp_crtc_disable(struct drm_crtc *crtc)
{
struct malidp_drm *malidp = crtc_to_malidp_device(crtc);
struct malidp_hw_device *hwdev = malidp->dev;
+ int err;

drm_crtc_vblank_off(crtc);
hwdev->enter_config_mode(hwdev);
clk_disable_unprepare(hwdev->pxlclk);
+
+ err = pm_runtime_put(crtc->dev->dev);
+ if (err < 0) {
+ DRM_DEBUG_DRIVER("Failed to disable runtime power management: %d\n", err);
+ }
}

static int malidp_crtc_atomic_check(struct drm_crtc *crtc,
diff --git a/drivers/gpu/drm/arm/malidp_drv.c b/drivers/gpu/drm/arm/malidp_drv.c
index f5cecdc3f14a..55fb086cd4b4 100644
--- a/drivers/gpu/drm/arm/malidp_drv.c
+++ b/drivers/gpu/drm/arm/malidp_drv.c
@@ -13,9 +13,11 @@
#include <linux/module.h>
#include <linux/clk.h>
#include <linux/component.h>
+#include <linux/console.h>
#include <linux/of_device.h>
#include <linux/of_graph.h>
#include <linux/of_reserved_mem.h>
+#include <linux/pm_runtime.h>

#include <drm/drmP.h>
#include <drm/drm_atomic.h>
@@ -91,6 +93,8 @@ static void malidp_atomic_commit_tail(struct drm_atomic_state *state)
{
struct drm_device *drm = state->dev;

+ pm_runtime_get_sync(drm->dev);
+
drm_atomic_helper_commit_modeset_disables(drm, state);

drm_atomic_helper_commit_planes(drm, state, 0);
@@ -101,6 +105,8 @@ static void malidp_atomic_commit_tail(struct drm_atomic_state *state)

drm_atomic_helper_wait_for_vblanks(drm, state);

+ pm_runtime_put(drm->dev);
+
drm_atomic_helper_cleanup_planes(drm, state);
}

@@ -283,6 +289,37 @@ static bool malidp_has_sufficient_address_space(const struct resource *res,

#define MAX_OUTPUT_CHANNELS 3

+static int malidp_runtime_pm_suspend(struct device *dev)
+{
+ struct drm_device *drm = dev_get_drvdata(dev);
+ struct malidp_drm *malidp = drm->dev_private;
+ struct malidp_hw_device *hwdev = malidp->dev;
+
+ /* we can only suspend if the hardware is in config mode */
+ WARN_ON(!hwdev->in_config_mode(hwdev));
+
+ hwdev->pm_suspended = true;
+ clk_disable_unprepare(hwdev->mclk);
+ clk_disable_unprepare(hwdev->aclk);
+ clk_disable_unprepare(hwdev->pclk);
+
+ return 0;
+}
+
+static int malidp_runtime_pm_resume(struct device *dev)
+{
+ struct drm_device *drm = dev_get_drvdata(dev);
+ struct malidp_drm *malidp = drm->dev_private;
+ struct malidp_hw_device *hwdev = malidp->dev;
+
+ clk_prepare_enable(hwdev->pclk);
+ clk_prepare_enable(hwdev->aclk);
+ clk_prepare_enable(hwdev->mclk);
+ hwdev->pm_suspended = false;
+
+ return 0;
+}
+
static int malidp_bind(struct device *dev)
{
struct resource *res;
@@ -312,7 +349,6 @@ static int malidp_bind(struct device *dev)
memcpy(hwdev, of_device_get_match_data(dev), sizeof(*hwdev));
malidp->dev = hwdev;

-
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
hwdev->regs = devm_ioremap_resource(dev, res);
if (IS_ERR(hwdev->regs))
@@ -345,14 +381,17 @@ static int malidp_bind(struct device *dev)
goto alloc_fail;
}

- /* Enable APB clock in order to get access to the registers */
- clk_prepare_enable(hwdev->pclk);
- /*
- * Enable AXI clock and main clock so that prefetch can start once
- * the registers are set
- */
- clk_prepare_enable(hwdev->aclk);
- clk_prepare_enable(hwdev->mclk);
+ drm->dev_private = malidp;
+ dev_set_drvdata(dev, drm);
+
+ /* Enable power management */
+ pm_runtime_enable(dev);
+
+ /* Resume device to enable the clocks */
+ if (pm_runtime_enabled(dev))
+ pm_runtime_get_sync(dev);
+ else
+ malidp_runtime_pm_resume(dev);

dev_id = of_match_device(malidp_drm_of_match, dev);
if (!dev_id) {
@@ -392,14 +431,12 @@ static int malidp_bind(struct device *dev)
out_depth = (out_depth << 8) | (output_width[i] & 0xf);
malidp_hw_write(hwdev, out_depth, hwdev->map.out_depth_base);

- drm->dev_private = malidp;
- dev_set_drvdata(dev, drm);
atomic_set(&malidp->config_valid, 0);
init_waitqueue_head(&malidp->wq);

ret = malidp_init(drm);
if (ret < 0)
- goto init_fail;
+ goto query_hw_fail;

/* Set the CRTC's port so that the encoder component can find it */
ep = of_graph_get_next_endpoint(dev->of_node, NULL);
@@ -426,6 +463,7 @@ static int malidp_bind(struct device *dev)
DRM_ERROR("failed to initialise vblank\n");
goto vblank_fail;
}
+ pm_runtime_put(dev);

drm_mode_config_reset(drm);

@@ -451,7 +489,9 @@ static int malidp_bind(struct device *dev)
drm_fbdev_cma_fini(malidp->fbdev);
malidp->fbdev = NULL;
}
+ drm_kms_helper_poll_fini(drm);
fbdev_fail:
+ pm_runtime_get_sync(dev);
drm_vblank_cleanup(drm);
vblank_fail:
malidp_se_irq_fini(drm);
@@ -464,13 +504,14 @@ static int malidp_bind(struct device *dev)
malidp->crtc.port = NULL;
port_fail:
malidp_fini(drm);
-init_fail:
+query_hw_fail:
+ pm_runtime_put(dev);
+ if (pm_runtime_enabled(dev))
+ pm_runtime_disable(dev);
+ else
+ malidp_runtime_pm_suspend(dev);
drm->dev_private = NULL;
dev_set_drvdata(dev, NULL);
-query_hw_fail:
- clk_disable_unprepare(hwdev->mclk);
- clk_disable_unprepare(hwdev->aclk);
- clk_disable_unprepare(hwdev->pclk);
drm_dev_unref(drm);
alloc_fail:
of_reserved_mem_device_release(dev);
@@ -482,7 +523,6 @@ static void malidp_unbind(struct device *dev)
{
struct drm_device *drm = dev_get_drvdata(dev);
struct malidp_drm *malidp = drm->dev_private;
- struct malidp_hw_device *hwdev = malidp->dev;

drm_dev_unregister(drm);
if (malidp->fbdev) {
@@ -490,18 +530,21 @@ static void malidp_unbind(struct device *dev)
malidp->fbdev = NULL;
}
drm_kms_helper_poll_fini(drm);
+ pm_runtime_get_sync(dev);
+ drm_vblank_cleanup(drm);
malidp_se_irq_fini(drm);
malidp_de_irq_fini(drm);
- drm_vblank_cleanup(drm);
component_unbind_all(dev, drm);
of_node_put(malidp->crtc.port);
malidp->crtc.port = NULL;
malidp_fini(drm);
+ pm_runtime_put(dev);
+ if (pm_runtime_enabled(dev))
+ pm_runtime_disable(dev);
+ else
+ malidp_runtime_pm_suspend(dev);
drm->dev_private = NULL;
dev_set_drvdata(dev, NULL);
- clk_disable_unprepare(hwdev->mclk);
- clk_disable_unprepare(hwdev->aclk);
- clk_disable_unprepare(hwdev->pclk);
drm_dev_unref(drm);
of_reserved_mem_device_release(dev);
}
@@ -557,11 +600,52 @@ static int malidp_platform_remove(struct platform_device *pdev)
return 0;
}

+static int __maybe_unused malidp_pm_suspend(struct device *dev)
+{
+ struct drm_device *drm = dev_get_drvdata(dev);
+ struct malidp_drm *malidp = drm->dev_private;
+
+ drm_kms_helper_poll_disable(drm);
+ console_lock();
+ drm_fbdev_cma_set_suspend(malidp->fbdev, 1);
+ console_unlock();
+ malidp->pm_state = drm_atomic_helper_suspend(drm);
+ if (IS_ERR(malidp->pm_state)) {
+ console_lock();
+ drm_fbdev_cma_set_suspend(malidp->fbdev, 0);
+ console_unlock();
+ drm_kms_helper_poll_enable(drm);
+ return PTR_ERR(malidp->pm_state);
+ }
+
+ return 0;
+}
+
+static int __maybe_unused malidp_pm_resume(struct device *dev)
+{
+ struct drm_device *drm = dev_get_drvdata(dev);
+ struct malidp_drm *malidp = drm->dev_private;
+
+ drm_atomic_helper_resume(drm, malidp->pm_state);
+ console_lock();
+ drm_fbdev_cma_set_suspend(malidp->fbdev, 0);
+ console_unlock();
+ drm_kms_helper_poll_enable(drm);
+
+ return 0;
+}
+
+static const struct dev_pm_ops malidp_pm_ops = {
+ SET_SYSTEM_SLEEP_PM_OPS(malidp_pm_suspend, malidp_pm_resume) \
+ SET_RUNTIME_PM_OPS(malidp_runtime_pm_suspend, malidp_runtime_pm_resume, NULL)
+};
+
static struct platform_driver malidp_platform_driver = {
.probe = malidp_platform_probe,
.remove = malidp_platform_remove,
.driver = {
.name = "mali-dp",
+ .pm = &malidp_pm_ops,
.of_match_table = malidp_drm_of_match,
},
};
diff --git a/drivers/gpu/drm/arm/malidp_drv.h b/drivers/gpu/drm/arm/malidp_drv.h
index dbc617c6e4ef..cd4c04c65ead 100644
--- a/drivers/gpu/drm/arm/malidp_drv.h
+++ b/drivers/gpu/drm/arm/malidp_drv.h
@@ -24,6 +24,7 @@ struct malidp_drm {
struct drm_crtc crtc;
wait_queue_head_t wq;
atomic_t config_valid;
+ struct drm_atomic_state *pm_state;
};

#define crtc_to_malidp_device(x) container_of(x, struct malidp_drm, crtc)
diff --git a/drivers/gpu/drm/arm/malidp_hw.h b/drivers/gpu/drm/arm/malidp_hw.h
index 00974b59407d..ea2dbae08990 100644
--- a/drivers/gpu/drm/arm/malidp_hw.h
+++ b/drivers/gpu/drm/arm/malidp_hw.h
@@ -156,6 +156,9 @@ struct malidp_hw_device {
u8 min_line_size;
u16 max_line_size;

+ /* track the device PM state */
+ bool pm_suspended;
+
/* size of memory used for rotating layers, up to two banks available */
u32 rotation_memory[2];
};
@@ -173,12 +176,14 @@ extern const struct malidp_hw_device malidp_device[MALIDP_MAX_DEVICES];

static inline u32 malidp_hw_read(struct malidp_hw_device *hwdev, u32 reg)
{
+ WARN_ON(hwdev->pm_suspended);
return readl(hwdev->regs + reg);
}

static inline void malidp_hw_write(struct malidp_hw_device *hwdev,
u32 value, u32 reg)
{
+ WARN_ON(hwdev->pm_suspended);
writel(value, hwdev->regs + reg);
}

--
2.12.0

Next message: Kirill A. Shutemov: "Re: [PATCH v4 05/11] mm: thp: enable thp migration in generic path"
Previous message: Alan Stern: "Re: usb: use-after-free write in usb_hcd_link_urb_to_ep"
Messages sorted by: [ date ] [ thread ] [ subject ] [ author ]