drm/i915/intel_panel: Avoid calls to intel_panel_fixed_mode() in mode_valid

Currently, most callers of intel_panel_mode_valid() also call
intel_panel_fixed_mode(). This is done either to check for the presence of
a fixed mode for the connector or to get the clock of the fixed mode, which
is then compared against the max dotclock for the pipe.

Since intel_panel_mode_valid() already calls intel_panel_fixed_mode()
internally, we can avoid yet another call to intel_panel_fixed_mode() from
the caller.

Remove the redundant call to intel_panel_fixed_mode() in mode_valid paths.
To get the clock for the fixed mode, extend the helper
intel_panel_mode_valid() to accept 'target_clock' as an out param.
The 'target_clock' can then be used by the callers to check against the
max dotclock.

Signed-off-by: Ankit Nautiyal <ankit.k.nautiyal@intel.com>
Reviewed-by: Suraj Kandpal <suraj.kandpal@intel.com>
Link: https://patch.msgid.link/20260430131220.3891497-3-ankit.k.nautiyal@intel.com

7 files changed, 24 insertions, 33 deletions

diff --git a/drivers/gpu/drm/i915/display/intel_dp.c b/drivers/gpu/drm/i915/display/intel_dp.c
index 98df93884e9a..77791845d5da 100644
--- a/drivers/gpu/drm/i915/display/intel_dp.c
+++ b/drivers/gpu/drm/i915/display/intel_dp.c
@@ -1571,7 +1571,6 @@ intel_dp_mode_valid(struct drm_connector *_connector,
 	struct intel_connector *connector = to_intel_connector(_connector);
 	const struct drm_display_info *info = &connector->base.display_info;
 	struct intel_dp *intel_dp = intel_attached_dp(connector);
-	const struct drm_display_mode *fixed_mode;
 	int target_clock = mode->clock;
 	enum drm_mode_status status;
 
@@ -1588,13 +1587,10 @@ intel_dp_mode_valid(struct drm_connector *_connector,
 	if (intel_dp_hdisplay_bad(display, mode->hdisplay))
 		return MODE_H_ILLEGAL;
 
-	fixed_mode = intel_panel_fixed_mode(connector, mode);
-	if (intel_dp_is_edp(intel_dp) && fixed_mode) {
-		status = intel_panel_mode_valid(connector, mode);
+	if (intel_dp_is_edp(intel_dp)) {
+		status = intel_panel_mode_valid(connector, mode, &target_clock);
 		if (status != MODE_OK)
 			return status;
-
-		target_clock = fixed_mode->clock;
 	}
 
 	/*
diff --git a/drivers/gpu/drm/i915/display/intel_dsi.c b/drivers/gpu/drm/i915/display/intel_dsi.c
index 9005c1f5d857..3a111f041071 100644
--- a/drivers/gpu/drm/i915/display/intel_dsi.c
+++ b/drivers/gpu/drm/i915/display/intel_dsi.c
@@ -63,18 +63,17 @@ enum drm_mode_status intel_dsi_mode_valid(struct drm_connector *connector,
 {
 	struct intel_display *display = to_intel_display(connector->dev);
 	struct intel_connector *intel_connector = to_intel_connector(connector);
-	const struct drm_display_mode *fixed_mode =
-		intel_panel_fixed_mode(intel_connector, mode);
 	int max_dotclk = display->cdclk.max_dotclk_freq;
 	enum drm_mode_status status;
+	int target_clock;
 
 	drm_dbg_kms(display->drm, "\n");
 
-	status = intel_panel_mode_valid(intel_connector, mode);
+	status = intel_panel_mode_valid(intel_connector, mode, &target_clock);
 	if (status != MODE_OK)
 		return status;
 
-	if (fixed_mode->clock > max_dotclk)
+	if (target_clock > max_dotclk)
 		return MODE_CLOCK_HIGH;
 
 	return intel_mode_valid_max_plane_size(display, mode, 1);
diff --git a/drivers/gpu/drm/i915/display/intel_dvo.c b/drivers/gpu/drm/i915/display/intel_dvo.c
index 405b33aca9dd..65015477abed 100644
--- a/drivers/gpu/drm/i915/display/intel_dvo.c
+++ b/drivers/gpu/drm/i915/display/intel_dvo.c
@@ -223,8 +223,6 @@ intel_dvo_mode_valid(struct drm_connector *_connector,
 	struct intel_display *display = to_intel_display(_connector->dev);
 	struct intel_connector *connector = to_intel_connector(_connector);
 	struct intel_dvo *intel_dvo = intel_attached_dvo(connector);
-	const struct drm_display_mode *fixed_mode =
-		intel_panel_fixed_mode(connector, mode);
 	int max_dotclk = display->cdclk.max_dotclk_freq;
 	int target_clock = mode->clock;
 	enum drm_mode_status status;
@@ -234,16 +232,9 @@ intel_dvo_mode_valid(struct drm_connector *_connector,
 		return status;
 
 	/* XXX: Validate clock range */
-
-	if (fixed_mode) {
-		enum drm_mode_status status;
-
-		status = intel_panel_mode_valid(connector, mode);
-		if (status != MODE_OK)
-			return status;
-
-		target_clock = fixed_mode->clock;
-	}
+	status = intel_panel_mode_valid(connector, mode, &target_clock);
+	if (status != MODE_OK)
+		return status;
 
 	if (target_clock > max_dotclk)
 		return MODE_CLOCK_HIGH;
diff --git a/drivers/gpu/drm/i915/display/intel_lvds.c b/drivers/gpu/drm/i915/display/intel_lvds.c
index cc6d4bfcff10..ab6ba08ac091 100644
--- a/drivers/gpu/drm/i915/display/intel_lvds.c
+++ b/drivers/gpu/drm/i915/display/intel_lvds.c
@@ -395,20 +395,19 @@ intel_lvds_mode_valid(struct drm_connector *_connector,
 {
 	struct intel_display *display = to_intel_display(_connector->dev);
 	struct intel_connector *connector = to_intel_connector(_connector);
-	const struct drm_display_mode *fixed_mode =
-		intel_panel_fixed_mode(connector, mode);
 	int max_pixclk = display->cdclk.max_dotclk_freq;
 	enum drm_mode_status status;
+	int target_clock;
 
 	status = intel_cpu_transcoder_mode_valid(display, mode);
 	if (status != MODE_OK)
 		return status;
 
-	status = intel_panel_mode_valid(connector, mode);
+	status = intel_panel_mode_valid(connector, mode, &target_clock);
 	if (status != MODE_OK)
 		return status;
 
-	if (fixed_mode->clock > max_pixclk)
+	if (target_clock > max_pixclk)
 		return MODE_CLOCK_HIGH;
 
 	return MODE_OK;
diff --git a/drivers/gpu/drm/i915/display/intel_panel.c b/drivers/gpu/drm/i915/display/intel_panel.c
index 2a20aaaaac39..20c548eea6da 100644
--- a/drivers/gpu/drm/i915/display/intel_panel.c
+++ b/drivers/gpu/drm/i915/display/intel_panel.c
@@ -396,11 +396,15 @@ intel_panel_detect(struct drm_connector *connector, bool force)
 
 enum drm_mode_status
 intel_panel_mode_valid(struct intel_connector *connector,
-		       const struct drm_display_mode *mode)
+		       const struct drm_display_mode *mode,
+		       int *target_clock)
 {
 	const struct drm_display_mode *fixed_mode =
 		intel_panel_fixed_mode(connector, mode);
 
+	if (target_clock)
+		*target_clock = mode->clock;
+
 	if (!fixed_mode)
 		return MODE_OK;
 
@@ -413,6 +417,9 @@ intel_panel_mode_valid(struct intel_connector *connector,
 	if (drm_mode_vrefresh(mode) != drm_mode_vrefresh(fixed_mode))
 		return MODE_PANEL;
 
+	if (target_clock)
+		*target_clock = fixed_mode->clock;
+
 	return MODE_OK;
 }
 
diff --git a/drivers/gpu/drm/i915/display/intel_panel.h b/drivers/gpu/drm/i915/display/intel_panel.h
index 56a6412cf0fb..23bd227826c9 100644
--- a/drivers/gpu/drm/i915/display/intel_panel.h
+++ b/drivers/gpu/drm/i915/display/intel_panel.h
@@ -43,7 +43,8 @@ int intel_panel_get_modes(struct intel_connector *connector);
 enum drrs_type intel_panel_drrs_type(struct intel_connector *connector);
 enum drm_mode_status
 intel_panel_mode_valid(struct intel_connector *connector,
-		       const struct drm_display_mode *mode);
+		       const struct drm_display_mode *mode,
+		       int *target_clock);
 int intel_panel_compute_config(struct intel_connector *connector,
 			       struct drm_display_mode *adjusted_mode);
 void intel_panel_add_edid_fixed_modes(struct intel_connector *connector,
diff --git a/drivers/gpu/drm/i915/display/intel_sdvo.c b/drivers/gpu/drm/i915/display/intel_sdvo.c
index e7aaa5b203fd..7843eb13f2e3 100644
--- a/drivers/gpu/drm/i915/display/intel_sdvo.c
+++ b/drivers/gpu/drm/i915/display/intel_sdvo.c
@@ -1967,15 +1967,13 @@ intel_sdvo_mode_valid(struct drm_connector *connector,
 
 	if (IS_LVDS(intel_sdvo_connector)) {
 		enum drm_mode_status status;
-		const struct drm_display_mode *fixed_mode;
+		int target_clock;
 
-		status = intel_panel_mode_valid(&intel_sdvo_connector->base, mode);
+		status = intel_panel_mode_valid(&intel_sdvo_connector->base, mode, &target_clock);
 		if (status != MODE_OK)
 			return status;
 
-		fixed_mode = intel_panel_fixed_mode(&intel_sdvo_connector->base, mode);
-
-		if (fixed_mode && fixed_mode->clock > max_dotclk)
+		if (target_clock > max_dotclk)
 			return MODE_CLOCK_HIGH;
 	}