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<p>Hi Jeevan,</p>
<div class="moz-cite-prefix">On 3/28/2025 2:21 PM, B, Jeevan wrote:<br>
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<pre wrap="" class="moz-quote-pre">-----Original Message-----
From: igt-dev <a class="moz-txt-link-rfc2396E" href="mailto:igt-dev-bounces@lists.freedesktop.org"><igt-dev-bounces@lists.freedesktop.org></a> On Behalf Of Naladala
Ramanaidu
Sent: Friday, March 28, 2025 2:23 AM
To: <a class="moz-txt-link-abbreviated" href="mailto:igt-dev@lists.freedesktop.org">igt-dev@lists.freedesktop.org</a>
Cc: Sharma, Swati2 <a class="moz-txt-link-rfc2396E" href="mailto:swati2.sharma@intel.com"><swati2.sharma@intel.com></a>; Naladala, Ramanaidu
<a class="moz-txt-link-rfc2396E" href="mailto:ramanaidu.naladala@intel.com"><ramanaidu.naladala@intel.com></a>
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 <a class="moz-txt-link-rfc2396E" href="mailto:ramanaidu.naladala@intel.com"><ramanaidu.naladala@intel.com></a>
---
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
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Can you please mention the spec number or Kernel patch where we have this restrictions mentioned ? </pre>
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As per Bspec: 49199 <span style="color: rgb(64, 64, 64); font-family: "Segoe UI", "Arial Unicode MS", "Lucida Grande", Helvetica, "Ubuntu Light", "DejaVu Sans", FreeSans, sans-serif; font-size: 13.3333px; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; orphans: 2; text-align: start; text-indent: 0px; text-transform: none; widows: 2; word-spacing: 0px; -webkit-text-stroke-width: 0px; white-space: normal; background-color: rgb(255, 255, 255); text-decoration-thickness: initial; text-decoration-style: initial; text-decoration-color: initial; display: inline !important; float: none;">Pipe
scalers maximum horizontal source size 4096 pixels.</span>
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</pre>
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<pre wrap="" class="moz-quote-pre">+
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
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</pre>
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