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[0/2] Fix USB2 PHY operation on Exynos542x

Message ID 20201120085637.7299-1-m.szyprowski@samsung.com
Headers show
Series Fix USB2 PHY operation on Exynos542x | expand

Message

Marek Szyprowski Nov. 20, 2020, 8:56 a.m. UTC 
Dear All,

This patchset finally fixes the last remaining issue related to the
system suspend/resume on Odroid XU3/XU4/HC1 board family. It can be
observed that system suspend/resume fails on XU4/HC1 when kernel is
compiled from multi_v7_defconfig. Chaning the configuration a bit -
switching Exynos USB2 PHY driver to be built-in surprisingly fixed that
issue. An investigation revealed that the Exynos USB2 PHY driver poked
wrong registers in the PMU area on Exynos5420 SoCs breaking the USB3.0
DRD PHY operation, what caused the suspend failure. Fix this by learning
the Exynos USB2 PHY driver about the Exynos5420 variant.

Best regards,
Marek Szyprowski


Patch summary:

Marek Szyprowski (2):
  phy: samsung: add support for the Exynos5420 variant of the USB2 PHY
  ARM: dts: exynos: use Exynos5420 dedicated USB2 PHY compatible

 .../devicetree/bindings/phy/samsung-phy.txt   |  1 +
 arch/arm/boot/dts/exynos54xx.dtsi             |  6 +--
 drivers/phy/samsung/Kconfig                   |  7 ++-
 drivers/phy/samsung/phy-exynos5250-usb2.c     | 48 +++++++++++++------
 drivers/phy/samsung/phy-samsung-usb2.c        |  6 +++
 drivers/phy/samsung/phy-samsung-usb2.h        |  1 +
 6 files changed, 51 insertions(+), 18 deletions(-)

-- 
2.17.1

Comments

Krzysztof Kozlowski Dec. 29, 2020, 3:50 p.m. UTC | #1 
On Fri, 20 Nov 2020 09:56:35 +0100, Marek Szyprowski wrote:
> This patchset finally fixes the last remaining issue related to the

> system suspend/resume on Odroid XU3/XU4/HC1 board family. It can be

> observed that system suspend/resume fails on XU4/HC1 when kernel is

> compiled from multi_v7_defconfig. Chaning the configuration a bit -

> switching Exynos USB2 PHY driver to be built-in surprisingly fixed that

> issue. An investigation revealed that the Exynos USB2 PHY driver poked

> wrong registers in the PMU area on Exynos5420 SoCs breaking the USB3.0

> DRD PHY operation, what caused the suspend failure. Fix this by learning

> the Exynos USB2 PHY driver about the Exynos5420 variant.

> 

> [...]


Applied, thanks!

[2/2] ARM: dts: exynos: use Exynos5420 dedicated USB2 PHY compatible
      commit: 75681980c4e3d89c55b5b8f20b8f4c1aace601be

Best regards,
-- 
Krzysztof Kozlowski <krzk@kernel.org>