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![]() The D-PHY specification (v1.2) explicitly mentions that the T-CLK-PRE
parameter's unit is Unit Interval(UI) and the minimum value is 8. Also,
kernel doc of the 'clk_pre' member of struct phy_configure_opts_mipi_dphy
mentions that it should be in UI. However, the dphy core driver wrongly
sets 'clk_pre' to 8000, which seems to hint that it's in picoseconds.
So, let's fix the dphy core driver to correctly reflect the T-CLK-PRE
parameter's minimum value according to the D-PHY specification.
I'm assuming that all impacted custom drivers shall program values in
TxByteClkHS cycles into hardware for the T-CLK-PRE parameter. The D-PHY
specification mentions that the frequency of TxByteClkHS is exactly 1/8
the High-Speed(HS) bit rate(each HS bit consumes one UI). So, relevant
custom driver code is changed to program those values as
DIV_ROUND_UP(cfg->clk_pre, BITS_PER_BYTE), then.
Note that I've only tested the patch with RM67191 DSI panel on i.MX8mq EVK.
Help is needed to test with other i.MX8mq, Meson and Rockchip platforms,
as I don't have the hardwares.
Fixes:
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.. | ||
allwinner | ||
amlogic | ||
broadcom | ||
cadence | ||
freescale | ||
hisilicon | ||
ingenic | ||
intel | ||
lantiq | ||
marvell | ||
mediatek | ||
microchip | ||
motorola | ||
mscc | ||
qualcomm | ||
ralink | ||
renesas | ||
rockchip | ||
samsung | ||
socionext | ||
st | ||
tegra | ||
ti | ||
xilinx | ||
Kconfig | ||
Makefile | ||
phy-can-transceiver.c | ||
phy-core-mipi-dphy.c | ||
phy-core.c | ||
phy-lgm-usb.c | ||
phy-lpc18xx-usb-otg.c | ||
phy-pistachio-usb.c | ||
phy-xgene.c |