drm/v3d: Add V3D tech revision to the device information

The V3D tech revision can be a useful information when configuring
jobs. Therefore, expose it in the `struct v3d_dev` with the V3D tech
version.

Signed-off-by: Maíra Canal <mcanal@igalia.com>
Reviewed-by: Iago Toral Quiroga <itoral@igalia.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20240714145243.1223131-1-mcanal@igalia.com

drivers/gpu/drm/v3d/v3d_drv.c

@@ -265,7 +265,7 @@ static int v3d_platform_drm_probe(struct platform_device *pdev)
 	struct v3d_dev *v3d;
 	int ret;
 	u32 mmu_debug;
-	u32 ident1;
+	u32 ident1, ident3;
 	u64 mask;
 
 	v3d = devm_drm_dev_alloc(dev, &v3d_drm_driver, struct v3d_dev, drm);
@@ -298,6 +298,9 @@ static int v3d_platform_drm_probe(struct platform_device *pdev)
 	v3d->cores = V3D_GET_FIELD(ident1, V3D_HUB_IDENT1_NCORES);
 	WARN_ON(v3d->cores > 1); /* multicore not yet implemented */
 
+	ident3 = V3D_READ(V3D_HUB_IDENT3);
+	v3d->rev = V3D_GET_FIELD(ident3, V3D_HUB_IDENT3_IPREV);
+
 	if (v3d->ver >= 71)
 		v3d->max_counters = V3D_V71_NUM_PERFCOUNTERS;
 	else if (v3d->ver >= 42)

drivers/gpu/drm/v3d/v3d_drv.h

@@ -98,10 +98,12 @@ struct v3d_perfmon {
 struct v3d_dev {
 	struct drm_device drm;
 
-	/* Short representation (e.g. 33, 41) of the V3D tech version
-	 * and revision.
-	 */
+	/* Short representation (e.g. 33, 41) of the V3D tech version */
 	int ver;
+
+	/* Short representation (e.g. 5, 6) of the V3D tech revision */
+	int rev;
+
 	bool single_irq_line;
 
 	/* Different revisions of V3D have different total number of performance