linux-kernel - [PATCH 2/2] drm/ingenic: Validate mode in a .mode

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Date:   Tue, 28 Jul 2020 17:16:41 +0200
From:   Paul Cercueil <paul@...pouillou.net>
To:     David Airlie <airlied@...ux.ie>, Daniel Vetter <daniel@...ll.ch>
Cc:     od@...c.me, dri-devel@...ts.freedesktop.org,
        linux-kernel@...r.kernel.org, Paul Cercueil <paul@...pouillou.net>
Subject: [PATCH 2/2] drm/ingenic: Validate mode in a .mode_valid callback

Validate modes in the drm_crtc_helper_funcs.mode_valid() callback, which
is designed for this purpose, instead of doing it in
drm_crtc_helper_funcs.atomic_check().

Signed-off-by: Paul Cercueil <paul@...pouillou.net>
---
 drivers/gpu/drm/ingenic/ingenic-drm-drv.c | 34 +++++++++++++----------
 1 file changed, 20 insertions(+), 14 deletions(-)

diff --git a/drivers/gpu/drm/ingenic/ingenic-drm-drv.c b/drivers/gpu/drm/ingenic/ingenic-drm-drv.c
index 64eabab3ef69..5dab9c3d0a52 100644
--- a/drivers/gpu/drm/ingenic/ingenic-drm-drv.c
+++ b/drivers/gpu/drm/ingenic/ingenic-drm-drv.c
@@ -199,21 +199,8 @@ static int ingenic_drm_crtc_atomic_check(struct drm_crtc *crtc,
 {
 	struct ingenic_drm *priv = drm_crtc_get_priv(crtc);
 	struct drm_plane_state *f1_state, *f0_state, *ipu_state = NULL;
-	long rate;
-
-	if (!drm_atomic_crtc_needs_modeset(state))
-		return 0;
-
-	if (state->mode.hdisplay > priv->soc_info->max_width ||
-	    state->mode.vdisplay > priv->soc_info->max_height)
-		return -EINVAL;
 
-	rate = clk_round_rate(priv->pix_clk,
-			      state->adjusted_mode.clock * 1000);
-	if (rate < 0)
-		return rate;
-
-	if (priv->soc_info->has_osd) {
+	if (drm_atomic_crtc_needs_modeset(state) && priv->soc_info->has_osd) {
 		f1_state = drm_atomic_get_plane_state(state->state, &priv->f1);
 		if (IS_ERR(f1_state))
 			return PTR_ERR(f1_state);
@@ -242,6 +229,24 @@ static int ingenic_drm_crtc_atomic_check(struct drm_crtc *crtc,
 	return 0;
 }
 
+static enum drm_mode_status
+ingenic_drm_crtc_mode_valid(struct drm_crtc *crtc, const struct drm_display_mode *mode)
+{
+	struct ingenic_drm *priv = drm_crtc_get_priv(crtc);
+	long rate;
+
+	if (mode->hdisplay > priv->soc_info->max_width)
+		return MODE_BAD_HVALUE;
+	if (mode->vdisplay > priv->soc_info->max_height)
+		return MODE_BAD_VVALUE;
+
+	rate = clk_round_rate(priv->pix_clk, mode->clock * 1000);
+	if (rate < 0)
+		return MODE_CLOCK_RANGE;
+
+	return MODE_OK;
+}
+
 static void ingenic_drm_crtc_atomic_begin(struct drm_crtc *crtc,
 					  struct drm_crtc_state *oldstate)
 {
@@ -655,6 +660,7 @@ static const struct drm_crtc_helper_funcs ingenic_drm_crtc_helper_funcs = {
 	.atomic_begin		= ingenic_drm_crtc_atomic_begin,
 	.atomic_flush		= ingenic_drm_crtc_atomic_flush,
 	.atomic_check		= ingenic_drm_crtc_atomic_check,
+	.mode_valid		= ingenic_drm_crtc_mode_valid,
 };
 
 static const struct drm_encoder_helper_funcs ingenic_drm_encoder_helper_funcs = {
-- 
2.27.0