drm/i915: use drm_printf() with the drm_err_printer intead of pr_err()

There's already a related drm_printer. Use it to preserve the context
instead of a separate pr_err().
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Reviewed-by: Luca Coelho <luciano.coelho@intel.com>
Acked-by: Maxime Ripard <mripard@kernel.org>
Link: https://patchwork.freedesktop.org/patch/msgid/246c0c275d05c919d959983e1784e3f7347f4540.1705410327.git.jani.nikula@intel.com

drivers/gpu/drm/i915/gt/selftest_engine_heartbeat.c

@@ -124,7 +124,7 @@ static int __live_idle_pulse(struct intel_engine_cs *engine,
 	if (engine_sync_barrier(engine)) {
 		struct drm_printer m = drm_err_printer(&engine->i915->drm, "pulse");
 
-		pr_err("%s: no heartbeat pulse?\n", engine->name);
+		drm_printf(&m, "%s: no heartbeat pulse?\n", engine->name);
 		intel_engine_dump(engine, &m, "%s", engine->name);
 
 		err = -ETIME;
@@ -138,8 +138,8 @@ static int __live_idle_pulse(struct intel_engine_cs *engine,
 	if (!i915_active_is_idle(&p->active)) {
 		struct drm_printer m = drm_err_printer(&engine->i915->drm, "pulse");
 
-		pr_err("%s: heartbeat pulse did not flush idle tasks\n",
-		       engine->name);
+		drm_printf(&m, "%s: heartbeat pulse did not flush idle tasks\n",
+			   engine->name);
 		i915_active_print(&p->active, &m);
 
 		err = -EINVAL;

drivers/gpu/drm/i915/selftests/i915_active.c

@@ -158,7 +158,7 @@ static int live_active_wait(void *arg)
 	if (!READ_ONCE(active->retired)) {
 		struct drm_printer p = drm_err_printer(&i915->drm, __func__);
 
-		pr_err("i915_active not retired after waiting!\n");
+		drm_printf(&p, "i915_active not retired after waiting!\n");
 		i915_active_print(&active->base, &p);
 
 		err = -EINVAL;
@@ -191,7 +191,7 @@ static int live_active_retire(void *arg)
 	if (!READ_ONCE(active->retired)) {
 		struct drm_printer p = drm_err_printer(&i915->drm, __func__);
 
-		pr_err("i915_active not retired after flushing!\n");
+		drm_printf(&p, "i915_active not retired after flushing!\n");
 		i915_active_print(&active->base, &p);
 
 		err = -EINVAL;