tree 6e82e4cbcfaf6b13a636823a45e008402fae4d85
parent 58faae28f64e9cb6d7f89596656db640392a1efc
author Jonathan Liu <net147@gmail.com> 1515463403 +1100
committer Maxime Ripard <maxime.ripard@free-electrons.com> 1515673543 +0100

drm/sun4i: hdmi: Add missing rate halving check in sun4i_tmds_determine_rate

It was only checking the divider when determing the closest match if
it could not match the requested rate exactly.

For a projector connected to an Olimex A20-OLinuXino-LIME using HDMI
with a native resolution of 1280x800 and pixel clock of 83.5 MHz, this
resulted in 1280x800 mode not being available and the following in dmesg
when the kernel is booted with drm.debug=0x3e:
[drm:drm_mode_debug_printmodeline] Modeline 37:"1280x800" 60 83500 1280 1352 1480 1680 800 810 816 831 0x48 0x5
[drm:drm_mode_prune_invalid] Not using 1280x800 mode: NOCLOCK

Fixes: 9c5681011a0c ("drm/sun4i: Add HDMI support")
Signed-off-by: Jonathan Liu <net147@gmail.com>
Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20180109020323.11852-4-net147@gmail.com