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Łukasz Lebiedziński 5a759b120e phy: exynos5-usbdrd: fix USB 2.0 HS PHY tuning values for Exynos7870 
The existing PHYPARAM0 tuning values for Exynos7870 are incorrect,
causing the USB 2.0 PHY to fail high-speed negotiation and fall back
to full-speed (12Mbps) operation.

Fix TXVREFTUNE (transmitter voltage reference) from 14 to 3,
TXRESTUNE (transmitter impedance) from 3 to 2, and SQRXTUNE
(squelch threshold) from 6 to 5. Also explicitly set
TXPREEMPPULSETUNE to 0, which was previously missing from the
tuning table despite being included in the register mask.

All values are derived from the vendor kernel for the Samsung
Galaxy A6 (SM-A600FN), as no public hardware documentation is
available for the Exynos7870 USB DRD PHY. With these corrections,
the PHY successfully negotiates high-speed (480Mbps) operation.

Fixes: 588d5d20ca ("phy: exynos5-usbdrd: add exynos7870 USBDRD support")
Cc: stable@vger.kernel.org
Tested-by: Kaustabh Chakraborty <kauschluss@disroot.org>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@oss.qualcomm.com>
Signed-off-by: Łukasz Lebiedziński <kernel@lvkasz.us>
Link: https://patch.msgid.link/20260406135627.234835-1-kernel@lvkasz.us
Signed-off-by: Vinod Koul <vkoul@kernel.org>
2026-05-10 17:14:31 +05:30
..
Kconfig phy: samsung: Do not enable PHY_EXYNOS5_USBDRD by default during compile testing 2025-04-11 12:48:34 +05:30
Makefile phy: samsung-ufs: support ExynosAutov920 ufs phy driver 2025-02-13 23:33:40 +05:30
phy-exynos-dp-video.c phy: Explicitly include correct DT includes 2023-07-17 11:52:56 +05:30
phy-exynos-mipi-video.c phy: exynos-mipi-video: correct cam0 sysreg property name for exynos7870 2025-07-22 18:44:51 +05:30
phy-exynos-pcie.c phy: samsung: phy-exynos-pcie: sanitize init/power_on callbacks 2022-08-01 15:25:12 -05:00
phy-exynos4x12-usb2.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500 2019-06-19 17:09:55 +02:00
phy-exynos5-usbdrd.c phy: exynos5-usbdrd: fix USB 2.0 HS PHY tuning values for Exynos7870 2026-05-10 17:14:31 +05:30
phy-exynos7-ufs.c phy: samsung-ufs: ufs: Add SoC callbacks for calibration and clk data recovery 2024-04-06 14:27:17 +05:30
phy-exynos4210-usb2.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500 2019-06-19 17:09:55 +02:00
phy-exynos5250-sata.c phy: samsung: exynos5250-sata: fix missing device put in probe error paths 2022-04-11 22:47:42 +05:30
phy-exynos5250-usb2.c phy: Fix the cacography in phy-exynos5250-usb2.c 2024-07-02 18:41:23 +05:30
phy-exynosautov9-ufs.c phy: samsung-ufs: ufs: Add SoC callbacks for calibration and clk data recovery 2024-04-06 14:27:17 +05:30
phy-exynosautov920-ufs.c phy: samsung-ufs: support ExynosAutov920 ufs phy driver 2025-02-13 23:33:40 +05:30
phy-fsd-ufs.c phy: samsung-ufs: ufs: Add SoC callbacks for calibration and clk data recovery 2024-04-06 14:27:17 +05:30
phy-gs101-ufs.c phy: samsung: gs101-ufs: Add .notify_phystate() & hibern8 enter/exit values 2025-11-18 22:26:02 +05:30
phy-s5pv210-usb2.c phy: samsung: s5pv210-usb2: Add delay after reset 2020-05-13 08:27:35 +05:30
phy-samsung-ufs.c phy: samsung: gs101-ufs: Add .notify_phystate() & hibern8 enter/exit values 2025-11-18 22:26:02 +05:30
phy-samsung-ufs.h phy: samsung: gs101-ufs: Add .notify_phystate() & hibern8 enter/exit values 2025-11-18 22:26:02 +05:30
phy-samsung-usb2.c phy: samsung: usb2: drop unused module alias 2025-08-13 12:19:25 +05:30
phy-samsung-usb2.h phy: samsung: Add support for the Exynos5420 variant of the USB2 PHY 2020-11-30 16:20:59 +05:30