drm: rcar-du: lvds: Avoid duplication of clock clamp code

Replace the duplicate code by a single central function.

Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>

4 files changed, 18 insertions, 10 deletions

diff --git a/drivers/gpu/drm/rcar-du/rcar_du_encoder.c b/drivers/gpu/drm/rcar-du/rcar_du_encoder.c
index c08700757feb..4e939e41f030 100644
--- a/drivers/gpu/drm/rcar-du/rcar_du_encoder.c
+++ b/drivers/gpu/drm/rcar-du/rcar_du_encoder.c
@@ -89,12 +89,8 @@ static int rcar_du_encoder_atomic_check(struct drm_encoder *encoder,
         /* The flat panel mode is fixed, just copy it to the adjusted mode. */
         drm_mode_copy(adjusted_mode, panel_mode);
 
-        /* The internal LVDS encoder has a clock frequency operating range of
-         * 30MHz to 150MHz. Clamp the clock accordingly.
-         */
         if (renc->lvds)
-                adjusted_mode->clock = clamp(adjusted_mode->clock,
-                                             30000, 150000);
+                rcar_du_lvdsenc_atomic_check(renc->lvds, adjusted_mode);
 
         return 0;
 }
diff --git a/drivers/gpu/drm/rcar-du/rcar_du_hdmienc.c b/drivers/gpu/drm/rcar-du/rcar_du_hdmienc.c
index 2567efcbee36..065b3a1d6134 100644
--- a/drivers/gpu/drm/rcar-du/rcar_du_hdmienc.c
+++ b/drivers/gpu/drm/rcar-du/rcar_du_hdmienc.c
@@ -71,12 +71,9 @@ static int rcar_du_hdmienc_atomic_check(struct drm_encoder *encoder,
         struct drm_display_mode *adjusted_mode = &crtc_state->adjusted_mode;
         const struct drm_display_mode *mode = &crtc_state->mode;
 
-        /* The internal LVDS encoder has a clock frequency operating range of
-         * 30MHz to 150MHz. Clamp the clock accordingly.
-         */
         if (hdmienc->renc->lvds)
-                adjusted_mode->clock = clamp(adjusted_mode->clock,
-                                             30000, 150000);
+                rcar_du_lvdsenc_atomic_check(hdmienc->renc->lvds,
+                                             adjusted_mode);
 
         if (sfuncs->mode_fixup == NULL)
                 return 0;
diff --git a/drivers/gpu/drm/rcar-du/rcar_du_lvdsenc.c b/drivers/gpu/drm/rcar-du/rcar_du_lvdsenc.c
index 85043c5bad03..937b2da98814 100644
--- a/drivers/gpu/drm/rcar-du/rcar_du_lvdsenc.c
+++ b/drivers/gpu/drm/rcar-du/rcar_du_lvdsenc.c
@@ -140,6 +140,15 @@ int rcar_du_lvdsenc_enable(struct rcar_du_lvdsenc *lvds, struct drm_crtc *crtc,
                 return -EINVAL;
 }
 
+void rcar_du_lvdsenc_atomic_check(struct rcar_du_lvdsenc *lvds,
+                                  struct drm_display_mode *mode)
+{
+        /* The internal LVDS encoder has a clock frequency operating range of
+         * 30MHz to 150MHz. Clamp the clock accordingly.
+         */
+        mode->clock = clamp(mode->clock, 30000, 150000);
+}
+
 static int rcar_du_lvdsenc_get_resources(struct rcar_du_lvdsenc *lvds,
                                          struct platform_device *pdev)
 {
diff --git a/drivers/gpu/drm/rcar-du/rcar_du_lvdsenc.h b/drivers/gpu/drm/rcar-du/rcar_du_lvdsenc.h
index 9a6001c07303..dfdba746edf4 100644
--- a/drivers/gpu/drm/rcar-du/rcar_du_lvdsenc.h
+++ b/drivers/gpu/drm/rcar-du/rcar_du_lvdsenc.h
@@ -30,6 +30,8 @@ enum rcar_lvds_input {
 int rcar_du_lvdsenc_init(struct rcar_du_device *rcdu);
 int rcar_du_lvdsenc_enable(struct rcar_du_lvdsenc *lvds,
                            struct drm_crtc *crtc, bool enable);
+void rcar_du_lvdsenc_atomic_check(struct rcar_du_lvdsenc *lvds,
+                                  struct drm_display_mode *mode);
 #else
 static inline int rcar_du_lvdsenc_init(struct rcar_du_device *rcdu)
 {
@@ -40,6 +42,10 @@ static inline int rcar_du_lvdsenc_enable(struct rcar_du_lvdsenc *lvds,
 {
         return 0;
 }
+static inline void rcar_du_lvdsenc_atomic_check(struct rcar_du_lvdsenc *lvds,
+                                                struct drm_display_mode *mode)
+{
+}
 #endif
 
 #endif /* __RCAR_DU_LVDSENC_H__ */