On Wed, Feb 08, 2017 at 03:23:53PM -0800, Steve Longerbeam wrote: > >Actually, this exact function already exists as dw_mipi_dsi_phy_write in > >drivers/gpu/drm/rockchip/dw-mipi-dsi.c, and it looks like the D-PHY > >register 0x44 might contain a field called HSFREQRANGE_SEL. > > Thanks for pointing out drivers/gpu/drm/rockchip/dw-mipi-dsi.c. > It's clear from that driver that there probably needs to be a fuller > treatment of the D-PHY programming here, but I don't know where > to find the MIPI CSI-2 D-PHY documentation for the i.MX6. The code > in imxcsi2_reset() was also pulled from FSL, and that's all I really have > to go on for the D-PHY programming. I assume the D-PHY is also a > Synopsys core, like the host controller, but the i.MX6 manual doesn't > cover it. Why exactly? What problems are you seeing that would necessitate a more detailed programming of the D-PHY? From my testing, I can wind a 2-lane MIPI bus on iMX6D from 912Mbps per lane down to (eg) 308Mbps per lane with your existing code without any issues. -- RMK's Patch system: http://www.armlinux.org.uk/developer/patches/ FTTC broadband for 0.8mile line: currently at 9.6Mbps down 400kbps up according to speedtest.net. -- To unsubscribe from this list: send the line "unsubscribe linux-media" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
