drm/v3d: Get rid of pm code

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 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 <[e-mail]>
Signed-off-by: Peter Robinson <[e-mail]>
Reviewed-by: Javier Martinez Canillas <[e-mail]>
Acked-by: Melissa Wen <[e-mail]>
Signed-off-by: Melissa Wen <[e-mail]>
Link: https://patchwork.freedesktop.org/patch/msgid/[e-mail]

drivers/gpu/drm/v3d/v3d_debugfs.c

···
 #include <linux/circ_buf.h>
 #include <linux/ctype.h>
 #include <linux/debugfs.h>
-#include <linux/pm_runtime.h>
 #include <linux/seq_file.h>
 #include <linux/string_helpers.h>
 
···
 	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);
···
 			   (misccfg & V3D_MISCCFG_OVRTMUOUT) != 0);
 	}
 
-	pm_runtime_mark_last_busy(v3d->drm.dev);
-	pm_runtime_put_autosuspend(v3d->drm.dev);
-
 	return 0;
 }
 
···
 	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,
···
 		   cycles,
 		   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;
 }

drivers/gpu/drm/v3d/v3d_drv.c

···
 #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>
···
 {
 	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,
···
 		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;
 	}
 
···
 		dev_err(dev, "Failed to allocate MMU scratch page\n");
 		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)

drivers/gpu/drm/v3d/v3d_gem.c

···
 #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>
···
 	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);
-
 	if (job->perfmon)
 		v3d_perfmon_put(job->perfmon);
 
···
 	job->v3d = v3d;
 	job->free = free;
 
-	ret = pm_runtime_get_sync(v3d->drm.dev);
-	if (ret < 0)
-		goto fail;
-
 	ret = drm_sched_job_init(&job->base, &v3d_priv->sched_entity[queue],
 				 v3d_priv);
 	if (ret)
-		goto fail_job;
+		goto fail;
 
 	if (has_multisync) {
 		if (se->in_sync_count && se->wait_stage == queue) {
···
 
 fail_deps:
 	drm_sched_job_cleanup(&job->base);
-fail_job:
-	pm_runtime_put_autosuspend(v3d->drm.dev);
 fail:
 	kfree(*container);
 	*container = NULL;