[PATCH v2 0/5] drm/vc4: hdmi: Support the 4k @ 60Hz modes

[Maxime Ripard]

Hi,

Here is a series that enables the higher resolutions on the HDMI0 Controller
found in the BCM2711 (RPi4).

In order to work it needs a few adjustments to config.txt, most notably to
enable the enable_hdmi_4kp60 option.

The firmware also has a glitch at the moment and will not properly release the
BSC controllers, which will make the EDID retrieval fail.

We can work around this using the following config.txt options:

disable_fw_kms_setup=1
hdmi_edid_file:0=1
hdmi_edid_filename:0=1366x768.bin
hdmi_ignore_edid:0=1
hdmi_edid_file:1=1
hdmi_edid_filename:1=1366x768.bin
hdmi_ignore_edid:1=1

A fix will come for the firmware eventually.

Let me know what you think,
Maxime

---

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

Maxime Ripard (5):
  drm/vc4: hvs: Make the HVS bind first
  drm/vc4: hdmi: Properly compute the BVB clock rate
  drm/vc4: hdmi: Check and warn if we can't reach 4kp60 frequencies
  drm/vc4: hdmi: Enable the scrambler
  drm/vc4: hdmi: Raise the maximum clock rate

 drivers/gpu/drm/vc4/vc4_drv.c       |  11 ++-
 drivers/gpu/drm/vc4/vc4_hdmi.c      | 101 +++++++++++++++++++++++++---
 drivers/gpu/drm/vc4/vc4_hdmi.h      |   8 +++
 drivers/gpu/drm/vc4/vc4_hdmi_regs.h |   3 +
 4 files changed, 113 insertions(+), 10 deletions(-)

-- 
2.30.2