[PATCH v2 2/2] drm: arcpgu: Use crtc->mode_valid() callback

[Jose Abreu <Jose.Abreu@synopsys.com>]

Now that we have a callback to check if crtc supports a given mode
we can use it in arcpgu so that we restrict the number of probbed
modes to the ones we can actually display.

This is specially useful because arcpgu crtc is responsible to set
a clock value in the commit() stage but unfortunatelly this clock
does not support all the needed ranges.

Signed-off-by: Jose Abreu <joabreu@synopsys.com>
Cc: Carlos Palminha <palminha@synopsys.com>
Cc: Alexey Brodkin <abrodkin@synopsys.com>
Cc: Ville Syrjälä <ville.syrjala@linux.intel.com>
Cc: Daniel Vetter <daniel.vetter@ffwll.ch>
Cc: Dave Airlie <airlied@linux.ie>
Cc: Andrzej Hajda <a.hajda@samsung.com>
---

Changes v1->v2:
	- Reduce code duplication by using helper function
	- crtc->mode_valid() "mode" field is now const

 drivers/gpu/drm/arc/arcpgu_crtc.c | 28 +++++++++++++++++++++++++---
 1 file changed, 25 insertions(+), 3 deletions(-)

diff --git a/drivers/gpu/drm/arc/arcpgu_crtc.c b/drivers/gpu/drm/arc/arcpgu_crtc.c
index ad9a959..631d86d 100644
--- a/drivers/gpu/drm/arc/arcpgu_crtc.c
+++ b/drivers/gpu/drm/arc/arcpgu_crtc.c
@@ -32,6 +32,18 @@
 	{ "r8g8b8", 24, {16, 8}, {8, 8}, {0, 8}, {0, 0}, DRM_FORMAT_RGB888 },
 };
 
+static bool arc_pgu_is_mode_valid(struct arcpgu_drm_private *arcpgu,
+				  const struct drm_display_mode *mode)
+{
+	long rate, clk_rate = mode->clock * 1000;
+
+	rate = clk_round_rate(arcpgu->clk, clk_rate);
+	if (rate != clk_rate)
+		return false;
+
+	return true;
+}
+
 static void arc_pgu_set_pxl_fmt(struct drm_crtc *crtc)
 {
 	struct arcpgu_drm_private *arcpgu = crtc_to_arcpgu_priv(crtc);
@@ -64,6 +76,17 @@ static void arc_pgu_set_pxl_fmt(struct drm_crtc *crtc)
 	.atomic_destroy_state = drm_atomic_helper_crtc_destroy_state,
 };
 
+enum drm_mode_status arc_pgu_crtc_mode_valid(struct drm_crtc *crtc,
+					     const struct drm_display_mode *mode)
+{
+	struct arcpgu_drm_private *arcpgu = crtc_to_arcpgu_priv(crtc);
+
+	if (!arc_pgu_is_mode_valid(arcpgu, mode))
+		return MODE_NOCLOCK;
+
+	return MODE_OK;
+}
+
 static void arc_pgu_crtc_mode_set_nofb(struct drm_crtc *crtc)
 {
 	struct arcpgu_drm_private *arcpgu = crtc_to_arcpgu_priv(crtc);
@@ -134,10 +157,8 @@ static int arc_pgu_crtc_atomic_check(struct drm_crtc *crtc,
 {
 	struct arcpgu_drm_private *arcpgu = crtc_to_arcpgu_priv(crtc);
 	struct drm_display_mode *mode = &state->adjusted_mode;
-	long rate, clk_rate = mode->clock * 1000;
 
-	rate = clk_round_rate(arcpgu->clk, clk_rate);
-	if (rate != clk_rate)
+	if (!arc_pgu_is_mode_valid(arcpgu, mode))
 		return -EINVAL;
 
 	return 0;
@@ -158,6 +179,7 @@ static void arc_pgu_crtc_atomic_begin(struct drm_crtc *crtc,
 }
 
 static const struct drm_crtc_helper_funcs arc_pgu_crtc_helper_funcs = {
+	.mode_valid	= arc_pgu_crtc_mode_valid,
 	.mode_set	= drm_helper_crtc_mode_set,
 	.mode_set_base	= drm_helper_crtc_mode_set_base,
 	.mode_set_nofb	= arc_pgu_crtc_mode_set_nofb,
-- 
1.9.1