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
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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
Maxime Ripard (9): drm/vc4: txp: Properly set the possible_crtcs mask drm/vc4: crtc: Skip the TXP drm/vc4: Rework the encoder retrieval code drm/vc4: hdmi: Prevent clock unbalance 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_crtc.c | 28 ++++++- drivers/gpu/drm/vc4/vc4_drv.c | 47 ++++++++++- drivers/gpu/drm/vc4/vc4_drv.h | 10 +++ drivers/gpu/drm/vc4/vc4_hdmi.c | 122 ++++++++++++++++++++++++++-- drivers/gpu/drm/vc4/vc4_hdmi.h | 8 ++ drivers/gpu/drm/vc4/vc4_hdmi_regs.h | 3 + drivers/gpu/drm/vc4/vc4_txp.c | 2 +- 7 files changed, 207 insertions(+), 13 deletions(-)