inno_hdmi_bridge_mode_valid() validates the pixel clock against
hdmi->refclk, but that clock is optional and is only present on
platforms that describe a "ref" clock. Platforms where the pixel clock
is produced by a separate device - such as the StarFive JH7110, whose
PHY is both the clock and the PHY provider - have no "ref" clock, so
the check is skipped entirely and every mode is reported as valid.
A mode the platform cannot generate is then advertised to userspace.
The subsequent modeset appears to succeed, since the atomic enable path
cannot fail, and the display silently stays blank.
Add a .mode_valid platform operation so platforms can reject modes they
are unable to drive. Platforms that do not implement it are unaffected.
Reviewed-by: Joshua Peisach <redacted>
Signed-off-by: Michal Wilczynski <m.wilczynski@samsung.com>
Sashiko has reviewed this patch and found no issues. It looks great!
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Sashiko AI review · https://sashiko.dev/#/patchset/20260915-jh7110-clean-send-v4-0-f0e4fd6f2cc8@samsung.com?part=10