drm/vc4: Add a getparam ioctl for getting the V3D identity regs.
As I extend the driver to support different V3D revisions, userspace
needs to know what version it's targeting. This is most easily
detected using the V3D identity registers.
v2: Make sure V3D is runtime PM on when reading the registers.
v3: Switch to a 64-bit param value (suggested by Rob Clark in review)
Signed-off-by: Eric Anholt <eric@anholt.net>
Acked-by: Daniel Vetter <daniel.vetter@ffwll.ch> (v2)
Reviewed-by: Rob Clark <robdclark@gmail.com> (v3, over irc)
diff --git a/drivers/gpu/drm/vc4/vc4_drv.c b/drivers/gpu/drm/vc4/vc4_drv.c
index 2f30214..047d7a2 100644
--- a/drivers/gpu/drm/vc4/vc4_drv.c
+++ b/drivers/gpu/drm/vc4/vc4_drv.c
@@ -14,6 +14,7 @@
#include <linux/module.h>
#include <linux/of_platform.h>
#include <linux/platform_device.h>
+#include <linux/pm_runtime.h>
#include "drm_fb_cma_helper.h"
#include "uapi/drm/vc4_drm.h"
@@ -43,6 +44,46 @@
return map;
}
+static int vc4_get_param_ioctl(struct drm_device *dev, void *data,
+ struct drm_file *file_priv)
+{
+ struct vc4_dev *vc4 = to_vc4_dev(dev);
+ struct drm_vc4_get_param *args = data;
+ int ret;
+
+ if (args->pad != 0)
+ return -EINVAL;
+
+ switch (args->param) {
+ case DRM_VC4_PARAM_V3D_IDENT0:
+ ret = pm_runtime_get_sync(&vc4->v3d->pdev->dev);
+ if (ret)
+ return ret;
+ args->value = V3D_READ(V3D_IDENT0);
+ pm_runtime_put(&vc4->v3d->pdev->dev);
+ break;
+ case DRM_VC4_PARAM_V3D_IDENT1:
+ ret = pm_runtime_get_sync(&vc4->v3d->pdev->dev);
+ if (ret)
+ return ret;
+ args->value = V3D_READ(V3D_IDENT1);
+ pm_runtime_put(&vc4->v3d->pdev->dev);
+ break;
+ case DRM_VC4_PARAM_V3D_IDENT2:
+ ret = pm_runtime_get_sync(&vc4->v3d->pdev->dev);
+ if (ret)
+ return ret;
+ args->value = V3D_READ(V3D_IDENT2);
+ pm_runtime_put(&vc4->v3d->pdev->dev);
+ break;
+ default:
+ DRM_DEBUG("Unknown parameter %d\n", args->param);
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
static void vc4_lastclose(struct drm_device *dev)
{
struct vc4_dev *vc4 = to_vc4_dev(dev);
@@ -74,6 +115,7 @@
DRM_IOCTL_DEF_DRV(VC4_CREATE_SHADER_BO, vc4_create_shader_bo_ioctl, DRM_RENDER_ALLOW),
DRM_IOCTL_DEF_DRV(VC4_GET_HANG_STATE, vc4_get_hang_state_ioctl,
DRM_ROOT_ONLY),
+ DRM_IOCTL_DEF_DRV(VC4_GET_PARAM, vc4_get_param_ioctl, DRM_RENDER_ALLOW),
};
static struct drm_driver vc4_drm_driver = {