[RFC/PATCH 00/11] Raspberry PI 4 V3D enablement

[RFC/PATCH 00/11] Raspberry PI 4 V3D enablement

[Nicolas Saenz Julienne]

This series attempts to enable V3D on BCM2711, the SoC available on the
Raspberry Pi 4 family of boards.

Due to the lack of documentation some things are taken as it from
testing/downstream implementation[1], which I'm hilighting here:

- It's not clear that the following is 100% true, maybe someone can confirm:

	"In BCM2711 the new ARGON ASB took over V3D. The old ASB is still
	present with the ISP and H264 bits, and V3D is in the same place in the
	new ASB as the old one."

- Patch #6 I took as is from the downstream implementation, I can't really
  provide an exact explanation on what changed HW wise.

Ultimately, I need confirmation from the Broadcom folks that they are alright
with patch #7.

With all this, I get a more or less stable experience using mesa 20.3.4 and
X11/Gnome.

Regards,
Nicolas

---

Nicolas Saenz Julienne (11):
  dt-bindings: soc: bcm: bcm2835-pm: Convert bindings to DT schema
  dt-bindings: soc: bcm: brcm,bcm2835-pm: Add support for bcm2711
  ARM: dts: bcm2711: Use proper compatible in PM/Watchdog node
  mfd: bcm2835-pm: Add support for BCM2711
  soc: bcm: bcm2835-power: Add support for BCM2711's ARSAN ASB
  soc: bcm: bcm2835-power: Bypass power_on/off() calls
  drm/v3d: Get rid of pm code
  drm/v3d: Add support for bcm2711
  ARM: dts: bcm2711: Enable V3D
  ARM: configs: Enable DRM_V3D
  arm64: config: Enable DRM_V3D

 .../bindings/soc/bcm/brcm,bcm2835-pm.txt      | 46 -----------
 .../bindings/soc/bcm/brcm,bcm2835-pm.yaml     | 80 +++++++++++++++++++
 arch/arm/boot/dts/bcm2711.dtsi                | 14 +++-
 arch/arm/configs/multi_v7_defconfig           |  1 +
 arch/arm64/configs/defconfig                  |  1 +
 drivers/gpu/drm/v3d/Kconfig                   |  2 +-
 drivers/gpu/drm/v3d/v3d_debugfs.c             | 18 +----
 drivers/gpu/drm/v3d/v3d_drv.c                 | 12 +--
 drivers/gpu/drm/v3d/v3d_gem.c                 |  9 ---
 drivers/mfd/bcm2835-pm.c                      | 55 ++++++++++---
 drivers/soc/bcm/bcm2835-power.c               | 74 +++++++++++------
 include/linux/mfd/bcm2835-pm.h                |  1 +
 12 files changed, 190 insertions(+), 123 deletions(-)
 delete mode 100644 Documentation/devicetree/bindings/soc/bcm/brcm,bcm2835-pm.txt
 create mode 100644 Documentation/devicetree/bindings/soc/bcm/brcm,bcm2835-pm.yaml

-- 
2.30.0

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[RFC/PATCH 07/11] drm/v3d: Get rid of pm code

[Nicolas Saenz Julienne]

Runtime PM doesn't seem to work correctly on this driver. On top of
that, commit 8b6864e3e138 (drm/v3d/v3d_drv: Remove unused static
variable 'v3d_v3d_pm_ops') hints that it most likely never did properly
as the driver's PM ops were not hooked-up.

So, in order to support regular operation with V3D on BCM2711 (Raspberry
Pi 4), get rid of the PM code. PM will be reinstated once we figure out
the underlying issues.

Signed-off-by: Nicolas Saenz Julienne <nsaenzjulienne@suse.de>
---
 drivers/gpu/drm/v3d/v3d_debugfs.c | 18 +-----------------
 drivers/gpu/drm/v3d/v3d_drv.c     | 11 -----------
 drivers/gpu/drm/v3d/v3d_gem.c     |  9 ---------
 3 files changed, 1 insertion(+), 37 deletions(-)

diff --git a/drivers/gpu/drm/v3d/v3d_debugfs.c b/drivers/gpu/drm/v3d/v3d_debugfs.c
index e76b24bb8828..e1d5f3423059 100644
--- a/drivers/gpu/drm/v3d/v3d_debugfs.c
+++ b/drivers/gpu/drm/v3d/v3d_debugfs.c
@@ -4,7 +4,6 @@
 #include <linux/circ_buf.h>
 #include <linux/ctype.h>
 #include <linux/debugfs.h>
-#include <linux/pm_runtime.h>
 #include <linux/seq_file.h>
 
 #include <drm/drm_debugfs.h>
@@ -130,11 +129,7 @@ static int v3d_v3d_debugfs_ident(struct seq_file *m, void *unused)
 	struct drm_device *dev = node->minor->dev;
 	struct v3d_dev *v3d = to_v3d_dev(dev);
 	u32 ident0, ident1, ident2, ident3, cores;
-	int ret, core;
-
-	ret = pm_runtime_get_sync(v3d->drm.dev);
-	if (ret < 0)
-		return ret;
+	int core;
 
 	ident0 = V3D_READ(V3D_HUB_IDENT0);
 	ident1 = V3D_READ(V3D_HUB_IDENT1);
@@ -187,9 +182,6 @@ static int v3d_v3d_debugfs_ident(struct seq_file *m, void *unused)
 			   (misccfg & V3D_MISCCFG_OVRTMUOUT) != 0);
 	}
 
-	pm_runtime_mark_last_busy(v3d->drm.dev);
-	pm_runtime_put_autosuspend(v3d->drm.dev);
-
 	return 0;
 }
 
@@ -217,11 +209,6 @@ static int v3d_measure_clock(struct seq_file *m, void *unused)
 	uint32_t cycles;
 	int core = 0;
 	int measure_ms = 1000;
-	int ret;
-
-	ret = pm_runtime_get_sync(v3d->drm.dev);
-	if (ret < 0)
-		return ret;
 
 	if (v3d->ver >= 40) {
 		V3D_CORE_WRITE(core, V3D_V4_PCTR_0_SRC_0_3,
@@ -245,9 +232,6 @@ static int v3d_measure_clock(struct seq_file *m, void *unused)
 		   cycles / (measure_ms * 1000),
 		   (cycles / (measure_ms * 100)) % 10);
 
-	pm_runtime_mark_last_busy(v3d->drm.dev);
-	pm_runtime_put_autosuspend(v3d->drm.dev);
-
 	return 0;
 }
 
diff --git a/drivers/gpu/drm/v3d/v3d_drv.c b/drivers/gpu/drm/v3d/v3d_drv.c
index 99e22beea90b..7a3336443a12 100644
--- a/drivers/gpu/drm/v3d/v3d_drv.c
+++ b/drivers/gpu/drm/v3d/v3d_drv.c
@@ -19,7 +19,6 @@
 #include <linux/module.h>
 #include <linux/of_platform.h>
 #include <linux/platform_device.h>
-#include <linux/pm_runtime.h>
 #include <linux/reset.h>
 
 #include <drm/drm_drv.h>
@@ -43,7 +42,6 @@ static int v3d_get_param_ioctl(struct drm_device *dev, void *data,
 {
 	struct v3d_dev *v3d = to_v3d_dev(dev);
 	struct drm_v3d_get_param *args = data;
-	int ret;
 	static const u32 reg_map[] = {
 		[DRM_V3D_PARAM_V3D_UIFCFG] = V3D_HUB_UIFCFG,
 		[DRM_V3D_PARAM_V3D_HUB_IDENT1] = V3D_HUB_IDENT1,
@@ -69,17 +67,12 @@ static int v3d_get_param_ioctl(struct drm_device *dev, void *data,
 		if (args->value != 0)
 			return -EINVAL;
 
-		ret = pm_runtime_get_sync(v3d->drm.dev);
-		if (ret < 0)
-			return ret;
 		if (args->param >= DRM_V3D_PARAM_V3D_CORE0_IDENT0 &&
 		    args->param <= DRM_V3D_PARAM_V3D_CORE0_IDENT2) {
 			args->value = V3D_CORE_READ(0, offset);
 		} else {
 			args->value = V3D_READ(offset);
 		}
-		pm_runtime_mark_last_busy(v3d->drm.dev);
-		pm_runtime_put_autosuspend(v3d->drm.dev);
 		return 0;
 	}
 
@@ -271,10 +264,6 @@ static int v3d_platform_drm_probe(struct platform_device *pdev)
 		return -ENOMEM;
 	}
 
-	pm_runtime_use_autosuspend(dev);
-	pm_runtime_set_autosuspend_delay(dev, 50);
-	pm_runtime_enable(dev);
-
 	ret = v3d_gem_init(drm);
 	if (ret)
 		goto dma_free;
diff --git a/drivers/gpu/drm/v3d/v3d_gem.c b/drivers/gpu/drm/v3d/v3d_gem.c
index 4eb354226972..75582b03470b 100644
--- a/drivers/gpu/drm/v3d/v3d_gem.c
+++ b/drivers/gpu/drm/v3d/v3d_gem.c
@@ -6,7 +6,6 @@
 #include <linux/io.h>
 #include <linux/module.h>
 #include <linux/platform_device.h>
-#include <linux/pm_runtime.h>
 #include <linux/reset.h>
 #include <linux/sched/signal.h>
 #include <linux/uaccess.h>
@@ -372,9 +371,6 @@ v3d_job_free(struct kref *ref)
 	dma_fence_put(job->irq_fence);
 	dma_fence_put(job->done_fence);
 
-	pm_runtime_mark_last_busy(job->v3d->drm.dev);
-	pm_runtime_put_autosuspend(job->v3d->drm.dev);
-
 	kfree(job);
 }
 
@@ -441,10 +437,6 @@ v3d_job_init(struct v3d_dev *v3d, struct drm_file *file_priv,
 	job->v3d = v3d;
 	job->free = free;
 
-	ret = pm_runtime_get_sync(v3d->drm.dev);
-	if (ret < 0)
-		return ret;
-
 	xa_init_flags(&job->deps, XA_FLAGS_ALLOC);
 
 	ret = drm_syncobj_find_fence(file_priv, in_sync, 0, 0, &in_fence);
@@ -460,7 +452,6 @@ v3d_job_init(struct v3d_dev *v3d, struct drm_file *file_priv,
 	return 0;
 fail:
 	xa_destroy(&job->deps);
-	pm_runtime_put_autosuspend(v3d->drm.dev);
 	return ret;
 }
 
-- 
2.30.0

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[RFC/PATCH 08/11] drm/v3d: Add support for bcm2711

[Nicolas Saenz Julienne]

Add compatible string and Kconfig options for bcm2711.

Signed-off-by: Nicolas Saenz Julienne <nsaenzjulienne@suse.de>
---
 drivers/gpu/drm/v3d/Kconfig   | 2 +-
 drivers/gpu/drm/v3d/v3d_drv.c | 1 +
 2 files changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/v3d/Kconfig b/drivers/gpu/drm/v3d/Kconfig
index 9a5c44606337..b0e048697964 100644
--- a/drivers/gpu/drm/v3d/Kconfig
+++ b/drivers/gpu/drm/v3d/Kconfig
@@ -1,7 +1,7 @@
 # SPDX-License-Identifier: GPL-2.0-only
 config DRM_V3D
 	tristate "Broadcom V3D 3.x and newer"
-	depends on ARCH_BCM || ARCH_BCMSTB || COMPILE_TEST
+	depends on ARCH_BCM || ARCH_BCMSTB || ARCH_BCM2835 || COMPILE_TEST
 	depends on DRM
 	depends on COMMON_CLK
 	depends on MMU
diff --git a/drivers/gpu/drm/v3d/v3d_drv.c b/drivers/gpu/drm/v3d/v3d_drv.c
index 7a3336443a12..1504b6f84441 100644
--- a/drivers/gpu/drm/v3d/v3d_drv.c
+++ b/drivers/gpu/drm/v3d/v3d_drv.c
@@ -184,6 +184,7 @@ static const struct drm_driver v3d_drm_driver = {
 static const struct of_device_id v3d_of_match[] = {
 	{ .compatible = "brcm,7268-v3d" },
 	{ .compatible = "brcm,7278-v3d" },
+	{ .compatible = "brcm,bcm2711-v3d" },
 	{},
 };
 MODULE_DEVICE_TABLE(of, v3d_of_match);
-- 
2.30.0

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