add lvds1024*800

hc

2024-01-31 f70575805708cabdedea7498aaa3f710fde4d920

 kernel/drivers/gpu/drm/drm_modeset_helper.c
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@@ -21,10 +21,12 @@
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  */
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 #include <drm/drm_atomic_helper.h>
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-#include <drm/drm_crtc_helper.h>
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 #include <drm/drm_fb_helper.h>
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+#include <drm/drm_fourcc.h>
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 #include <drm/drm_modeset_helper.h>
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 #include <drm/drm_plane_helper.h>
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+#include <drm/drm_print.h>
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+#include <drm/drm_probe_helper.h>
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 /**
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  * DOC: aux kms helpers
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@@ -146,6 +148,21 @@
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  * Initialize a CRTC object with a default helper-provided primary plane and no
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  * cursor plane.
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  *
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+ * Note that we make some assumptions about hardware limitations that may not be
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+ * true for all hardware:
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+ *
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+ * 1. Primary plane cannot be repositioned.
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+ * 2. Primary plane cannot be scaled.
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+ * 3. Primary plane must cover the entire CRTC.
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+ * 4. Subpixel positioning is not supported.
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+ * 5. The primary plane must always be on if the CRTC is enabled.
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+ *
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+ * This is purely a backwards compatibility helper for old drivers. Drivers
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+ * should instead implement their own primary plane. Atomic drivers must do so.
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+ * Drivers with the above hardware restriction can look into using &struct
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+ * drm_simple_display_pipe, which encapsulates the above limitations into a nice
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+ * interface.
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+ *
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  * Returns:
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  * Zero on success, error code on failure.
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  */