DWC_mipi_dsi_host can be configured to send the low-power (LP)
commands during the HS video mode transmission. To enable this
feature, set the lp_cmd_en bit of the VID_MODE_CFG register to 1.
In this case, it is necessary to calculate the time available,
in bytes, to transmit a command in LP mode to Horizontal Front Porch (HFP),
Vertical Sync Active (VSA), Vertical Back Porch (VBP), and
Vertical Front Porch (VFP) regions.
Bits 8 to 13 of the VID_MODE_CFG register indicates if DWC_mipi_dsi_host
can go to LP when in idle. If the lp_cmd_en bit is set (1'b1) and
non-video packets are in queue, DWC_mipi_dsi_host ignores the LP
configuration and transmits LP commands, even if it is not allowed
to enter LP in a specific region. After the LP commands transmission,
DWC_mipi_dsi_host remains in LP until a sync event occurs.
If the lp_cmd_en bit of the VID_MODE_CFG register is 0, the commands
are sent in high-speed in Video Mode. In this case, the DWC_mipi_dsi_host
automatically determines the area where each command can be sent and no
programming or calculation is required.
Change-Id: Id47982c2c7605be17c4d295707fd5496f32f79fe
Signed-off-by: Wyon Bi <bivvy.bi@rock-chips.com>
8d080a0b20