The Raspberry Pi display driver for Linux may support 4K@60Hz

by ddos · August 21, 2021

The mailing list shows that the DRM/VC4 driver of the Raspberry Pi will support 4K@60Hz display output. For some time, Maxime Ripard has been working on improving the DRM/VC4 driver so that it can drive the HDMI output from Raspberry Pi at 4K@60Hz. These patches are now the 7th revision, including fixing the HPD GPIO detection of HDMI, removing the DDC probe for status detection, adding an encoder to the vc4_crtc_config_pv prototype, etc.

Image: raspberrypi

Changes from v6:
– Rebased on current drm-misc-next
– Removed stale clk_request pointer

Changes from v5:
– Fixed unused variables warning

Changes from v4:
– Removed the patches already applied
– Added various fixes for the issues that have been discovered on the
downstream tree

Changes from v3:
– Rework the encoder retrieval code that was broken on the RPi3 and older
– Fix a scrambling enabling issue on some display

Changes from v2:
– Gathered the various tags
– Added Cc stable when relevant
– Split out the check to test whether the scrambler is required into
an helper
– Fixed a bug where the scrambler state wouldn’t be tracked properly
if it was enabled at boot

Changes from v1:
– Dropped the range accessors
– Drop the mention of force_turbo
– Reordered the SCRAMBLER_CTL register to match the offset
– Removed duplicate HDMI_14_MAX_TMDS_CLK define
– Warn about enable_hdmi_4kp60 only if there’s some modes that can’t be reached
– Rework the BVB clock computation

Currently, the VC4 driver’s support for 4K@60Hz is stabilizing, so it may be merged into the mainline soon. However, since the deadline for merging DRM-Next has now passed, it may not appear in the upcoming Linux 5.15 merge window.

Support Our Threat Intelligence

If you find our technology report and cybersecurity news helpful, consider supporting our work.

Buy Me a Coffee PayPal