mirror of
https://github.com/torvalds/linux.git
synced 2024-11-25 13:41:51 +00:00
32267c29bc
Add support for the Exynos USB 3.1 DRD combo phy, as found in Exynos 9 SoCs like Google GS101. It supports USB SS, HS and DisplayPort. In terms of UTMI+, this is very similar to the existing Exynos850 support in this driver. The difference is that this combo phy supports both UTMI+ (HS) and PIPE3 (SS). It also supports DP alt mode. The number of ports for UTMI+ and PIPE3 can be determined using the LINKPORT register (which also exists on Exynos E850). For SuperSpeed (SS) a new SS phy is in use and its PIPE3 interface is new compared to Exynos E850, and also very different from the existing support for older Exynos SoCs in this driver. The SS phy needs a bit more configuration work and register tuning for signal quality to work reliably, presumably due to the higher frequency, e.g. to account for different board layouts. Additionally, power needs to be enabled before writing to the SS phy registers. This commit adds the necessary changes for USB HS and SS to work. DisplayPort is out of scope in this commit. Notes: * For the register tuning, exynos5_usbdrd_apply_phy_tunes() has been added with the appropriate data structures to support tuning at various stages during initialisation. Since these are hardware specific, the platform data is supposed to be populated accordingly. The implementation is loosely modelled after the Samsung UFS PHY driver. There is one tuning state for UTMI+, PTS_UTMI_POSTINIT, to execute after init and generally intended for HS signal tuning, as done in this commit. PTS_PIPE3_PREINIT PTS_PIPE3_INIT PTS_PIPE3_POSTINIT PTS_PIPE3_POSTLOCK are tuning states for PIPE3. In the downstream driver, preinit differs by Exynos SoC, and postinit and postlock are different per board. The latter haven't been implemented for gs101 here, because downstream doesn't use them on gs101 either. * Signal lock acquisition for SS depends on the orientation of the USB-C plug. Since there currently is no infrastructure to chain connector events to both the USB DWC3 driver and this phy driver, a work-around has been added in exynos5_usbdrd_usbdp_g2_v4_pma_check_cdr_lock() to check both registers if it failed in one of the orientations. * Equally, we can only establish SS speed in one of the connector orientations due to programming differences when selecting the lane mux in exynos5_usbdrd_usbdp_g2_v4_pma_lane_mux_sel(), which really needs to be dynamic, based on the orientation of the connector. * As is, we can establish a HS link using any cable, and an SS link in one orientation of the plug, falling back to HS if the orientation is reversed to the expectation. Signed-off-by: André Draszik <andre.draszik@linaro.org> Reviewed-by: Peter Griffin <peter.griffin@linaro.org> Tested-by: Peter Griffin <peter.griffin@linaro.org> Tested-by: Will McVicker <willmcvicker@google.com> Link: https://lore.kernel.org/r/20240617-usb-phy-gs101-v3-6-b66de9ae7424@linaro.org Signed-off-by: Vinod Koul <vkoul@kernel.org> |
||
|---|---|---|
| .. | ||
| Kconfig | ||
| Makefile | ||
| phy-exynos4x12-usb2.c | ||
| phy-exynos5-usbdrd.c | ||
| phy-exynos7-ufs.c | ||
| phy-exynos4210-usb2.c | ||
| phy-exynos5250-sata.c | ||
| phy-exynos5250-usb2.c | ||
| phy-exynos-dp-video.c | ||
| phy-exynos-mipi-video.c | ||
| phy-exynos-pcie.c | ||
| phy-exynosautov9-ufs.c | ||
| phy-fsd-ufs.c | ||
| phy-gs101-ufs.c | ||
| phy-s5pv210-usb2.c | ||
| phy-samsung-ufs.c | ||
| phy-samsung-ufs.h | ||
| phy-samsung-usb2.c | ||
| phy-samsung-usb2.h | ||