Hi Jeevan,

-----Original Message-----
From: igt-dev <igt-dev-bounces@lists.freedesktop.org> On Behalf Of Naladala
Ramanaidu
Sent: Friday, March 28, 2025 2:23 AM
To: igt-dev@lists.freedesktop.org
Cc: Sharma, Swati2 <swati2.sharma@intel.com>; Naladala, Ramanaidu
<ramanaidu.naladala@intel.com>
Subject: [PATCH i-g-t v1 1/3] lib/igt_kms: Add mode restriction check for Intel
scaling

Add function to verify display mode parameters (horizontal resolution, vertical
resolution, refresh rate) within 4K limits for scaling operation.

Signed-off-by: Naladala Ramanaidu <ramanaidu.naladala@intel.com>
---
 lib/igt_kms.c | 23 +++++++++++++++++++++++  lib/igt_kms.h |  1 +
 2 files changed, 24 insertions(+)

diff --git a/lib/igt_kms.c b/lib/igt_kms.c index 99c8707c7..332f6dbf3 100644
--- a/lib/igt_kms.c
+++ b/lib/igt_kms.c
@@ -93,6 +93,10 @@
 #define MAX_EDID 2
 #define DISPLAY_TILE_BLOCK 0x12

+#define HDISPLAY_SCALING_MAX 3840
+#define VDISPLAY_SCALING_MAX 2160
+#define VREFRESH_SCALING_MAX 60

Can you please mention the spec number or Kernel patch where we have this restrictions mentioned ? 

+
 typedef bool (*igt_connector_attr_set)(int dir, const char *attr, const char
*value);

 struct igt_connector_attr {
@@ -6998,6 +7002,25 @@ int get_num_scalers(igt_display_t *display, enum pipe
pipe)
 	return num_scalers;
 }

+/**
+ * is_intel_support_scaling:
+ * @drmModeModeInfo *mode: Pointer to a structure with display mode
information.
+ *
+ * Finds the display mode's horizontal resolution, vertical resolution,
+and refresh
+ * rate are within the specified maximum limits.
+ *
+ * Returns: true on success, false  on failure  */ bool
+is_intel_support_scaling(drmModeModeInfo *mode) {
+	if ((mode->hdisplay <= HDISPLAY_SCALING_MAX) &&
+	    (mode->vdisplay <= VDISPLAY_SCALING_MAX) &&
+	    (mode->vrefresh <= VREFRESH_SCALING_MAX))
+		return true;
+
+	return false;
+}
+
 /**
  * igt_parse_marked_value:
  * @buf: Buffer containing the content to parse diff --git a/lib/igt_kms.h
b/lib/igt_kms.h index 0381c82ad..0e3d1297d 100644
--- a/lib/igt_kms.h
+++ b/lib/igt_kms.h
@@ -1279,5 +1279,6 @@ void igt_set_link_params(int drm_fd, igt_output_t
*output,
 			   char *link_rate, char *lane_count);  int
igt_backlight_read(int *result, const char *fname, igt_backlight_context_t
*context);  int igt_backlight_write(int value, const char *fname,
igt_backlight_context_t *context);
+bool is_intel_support_scaling(drmModeModeInfo *mode);

 #endif /* __IGT_KMS_H__ */
--
2.43.0