I am working on the HDMI driver for the i.MX6 as part of the larger DRM
driver written by Sascha Hauer and need a little advice. I seem to be
missing one important part of the subsystem that I haven't been able to
resolve.
In my testing, powering on the system with only a HDMI cable connected
works perfectly. Resolution is set to 1920x1080 as requested (with the
framebuffer console at the same resolution).
If I boot up the system without an HDMI cable connected (or any other
cable), I get the expected:
[ 1.470273] imx_hdmi_connector_detect
[ 1.470276] returned cable DISCONNECTED
[ 1.470289] imx-drm imx-drm: No connectors reported connected with modes
[ 1.470297] [drm] Cannot find any crtc or sizes - going 1024x768
When I connect the cable at a later time, all EDID detected modes are
'truncated' to '<= 1024x768', but because I have a video=xxx in
bootargs, the driver still seems to initialize to 1920x1080, but with a
framebuffer of 1024x768.
I assume this is a mistake on my part, but I don't know what I'm missing
that would cause it.
I see in drm_crtc_helper.c:drm_helper_mode_fill_fb_struct that the
width/height are set to the initialized mode.
Later in drm_fb_helper.c:drm_fb_helper_hotplug_event, max_width if set
to fb->width.
This is what causes the modes to be truncated when the HDMI connector is
finally connected (max_width is now limited to 1024).
Suggestions appreciated.
Regards
Tony Prisk
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