[PATCH v7 4/9] drm/panic: Add drm_panic_is_format_supported()

From: Jocelyn Falempe <jfalempe@redhat.com>
To: dri-devel@lists.freedesktop.org, tzimmermann@suse.de,
	airlied@redhat.com, maarten.lankhorst@linux.intel.com,
	mripard@kernel.org, daniel@ffwll.ch, javierm@redhat.com,
	bluescreen_avenger@verizon.net, noralf@tronnes.org
Cc: gpiccoli@igalia.com, Jocelyn Falempe <jfalempe@redhat.com>
Subject: [PATCH v7 4/9] drm/panic: Add drm_panic_is_format_supported()
Date: Thu,  4 Jan 2024 17:00:48 +0100	[thread overview]
Message-ID: <20240104160301.185915-5-jfalempe@redhat.com> (raw)
In-Reply-To: <20240104160301.185915-1-jfalempe@redhat.com>

So driver knows early if drm_panic will be able to display something
on the current scanout buffer.

Signed-off-by: Jocelyn Falempe <jfalempe@redhat.com>
---
 drivers/gpu/drm/drm_panic.c | 13 +++++++++++++
 include/drm/drm_panic.h     |  4 ++++
 2 files changed, 17 insertions(+)

diff --git a/drivers/gpu/drm/drm_panic.c b/drivers/gpu/drm/drm_panic.c
index 362a696ec48a..c68167cd4c08 100644
--- a/drivers/gpu/drm/drm_panic.c
+++ b/drivers/gpu/drm/drm_panic.c
@@ -348,6 +348,19 @@ void drm_panic_unregister(struct drm_device *dev)
 }
 EXPORT_SYMBOL(drm_panic_unregister);
 
+/**
+ * drm_panic_is_format_supported()
+ * @format: a fourcc color code
+ * Returns: true if supported, false otherwise.
+ *
+ * Check if drm_panic will be able to use this color format.
+ */
+bool drm_panic_is_format_supported(u32 format)
+{
+	return drm_fb_convert_from_xrgb8888(0xffffff, format) != 0;
+}
+EXPORT_SYMBOL(drm_panic_is_format_supported);
+
 /**
  * drm_panic_init() - Initialize drm-panic subsystem
  *
diff --git a/include/drm/drm_panic.h b/include/drm/drm_panic.h
index bcf392b6fa1b..1549c8eb8dcc 100644
--- a/include/drm/drm_panic.h
+++ b/include/drm/drm_panic.h
@@ -84,6 +84,8 @@ void drm_panic_exit(void);
 void drm_panic_register(struct drm_device *dev);
 void drm_panic_unregister(struct drm_device *dev);
 
+bool drm_panic_is_format_supported(u32 format);
+
 #else
 
 static inline void drm_panic_init(void) {}
@@ -92,6 +94,8 @@ static inline void drm_panic_exit(void) {}
 static inline void drm_panic_register(struct drm_device *dev) {}
 static inline void drm_panic_unregister(struct drm_device *dev) {}
 
+bool drm_panic_is_format_supported(u32 format) {return false; }
+
 #endif
 
 #endif /* __DRM_PANIC_H__ */
-- 
2.43.0

