[PATCH v3 2/3] drm/i915/display: Make POWER_DOMAIN_*() always result in enum intel_display_power_domain

[Gustavo Sousa <gustavo.sousa@intel.com>]

In the hope of contributing to type safety in our code, let's ensure
that the type returned by the POWER_DOMAIN_*() macros is always of type
enum intel_display_power_domain.

v2:
  - Remove accidental +1 in definition of POWER_DOMAIN_PIPE(). (Jani)

Cc: Jani Nikula <jani.nikula@intel.com>
Signed-off-by: Gustavo Sousa <gustavo.sousa@intel.com>
---
 drivers/gpu/drm/i915/display/intel_display_power.h | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/drivers/gpu/drm/i915/display/intel_display_power.h b/drivers/gpu/drm/i915/display/intel_display_power.h
index 4ad35bd4b040..1b53d67f9b60 100644
--- a/drivers/gpu/drm/i915/display/intel_display_power.h
+++ b/drivers/gpu/drm/i915/display/intel_display_power.h
@@ -117,12 +117,13 @@ enum intel_display_power_domain {
 	POWER_DOMAIN_INVALID = POWER_DOMAIN_NUM,
 };
 
-#define POWER_DOMAIN_PIPE(pipe) ((pipe) - PIPE_A + POWER_DOMAIN_PIPE_A)
+#define POWER_DOMAIN_PIPE(pipe) \
+	((enum intel_display_power_domain)((pipe) - PIPE_A + POWER_DOMAIN_PIPE_A))
 #define POWER_DOMAIN_PIPE_PANEL_FITTER(pipe) \
-		((pipe) - PIPE_A + POWER_DOMAIN_PIPE_PANEL_FITTER_A)
+	((enum intel_display_power_domain)((pipe) - PIPE_A + POWER_DOMAIN_PIPE_PANEL_FITTER_A))
 #define POWER_DOMAIN_TRANSCODER(tran) \
 	((tran) == TRANSCODER_EDP ? POWER_DOMAIN_TRANSCODER_EDP : \
-	 (tran) - TRANSCODER_A + POWER_DOMAIN_TRANSCODER_A)
+	 (enum intel_display_power_domain)((tran) - TRANSCODER_A + POWER_DOMAIN_TRANSCODER_A))
 
 struct intel_power_domain_mask {
 	DECLARE_BITMAP(bits, POWER_DOMAIN_NUM);
-- 
2.48.1