Re: [PATCH v6 0/7] PCI: amlogic: Make PCIe working reliably on AXG platforms

From: Remi Pommarel
Date: Fri Jan 24 2020 - 03:29:24 EST


Hi,

On Fri, Jan 24, 2020 at 09:02:12AM +0100, Neil Armstrong wrote:
> Hi,
>
> On 24/01/2020 00:29, Remi Pommarel wrote:
> > PCIe device probing failures have been seen on AXG platforms and were
> > due to unreliable clock signal output. Setting HHI_MIPI_CNTL0[26] bit
> > in MIPI's PHY registers solved the problem. This bit controls band gap
> > reference.
> >
> > As discussed here [1] one of these shared MIPI/PCIE analog PHY register
> > bits was implemented in the clock driver as CLKID_MIPI_ENABLE. This adds
> > a PHY driver to control this bit instead, as well as setting the band
> > gap one in order to get reliable PCIE communication.
> >
> > While at it add another PHY driver to control PCIE only PHY registers,
> > making AXG code more similar to G12A platform thus allowing to remove
> > some specific platform handling in pci-meson driver.
> >
> > Please note that CLKID_MIPI_ENABLE removable will be done in a different
> > serie.
> >
> > Changes since v5:
> > - Add additionalProperties in device tree binding documentation
> > - Make analog PHY required
> >
> > Changes since v4:
> > - Rename the shared MIPI/PCIe PHY to analog
> > - Chain the MIPI/PCIe PHY to the PCIe one
> >
> > Changes since v3:
> > - Go back to the shared MIPI/PCIe phy driver solution from v2
> > - Remove syscon usage
> > - Add all dt-bindings documentation
> >
> > Changes since v2:
> > - Remove shared MIPI/PCIE device driver and use syscon to access register
> > in PCIE only driver instead
> > - Include devicetree documentation
> >
> > Changes sinve v1:
> > - Move HHI_MIPI_CNTL0 bit control in its own PHY driver
> > - Add a PHY driver for PCIE_PHY registers
> > - Modify pci-meson.c to make use of both PHYs and remove specific
> > handling for AXG and G12A
> >
> > [1] https://lkml.org/lkml/2019/12/16/119
> >
> > Remi Pommarel (7):
> > dt-bindings: Add AXG PCIE PHY bindings
> > dt-bindings: Add AXG shared MIPI/PCIE analog PHY bindings
> > dt-bindings: PCI: meson: Update PCIE bindings documentation
> > arm64: dts: meson-axg: Add PCIE PHY nodes
> > phy: amlogic: Add Amlogic AXG MIPI/PCIE analog PHY Driver
> > phy: amlogic: Add Amlogic AXG PCIE PHY Driver
> > PCI: amlogic: Use AXG PCIE
> >
> > .../bindings/pci/amlogic,meson-pcie.txt | 22 +-
> > .../amlogic,meson-axg-mipi-pcie-analog.yaml | 35 ++++
> > .../bindings/phy/amlogic,meson-axg-pcie.yaml | 52 +++++
> > arch/arm64/boot/dts/amlogic/meson-axg.dtsi | 16 ++
> > drivers/pci/controller/dwc/pci-meson.c | 116 ++---------
> > drivers/phy/amlogic/Kconfig | 22 ++
> > drivers/phy/amlogic/Makefile | 12 +-
> > .../amlogic/phy-meson-axg-mipi-pcie-analog.c | 188 +++++++++++++++++
> > drivers/phy/amlogic/phy-meson-axg-pcie.c | 192 ++++++++++++++++++
> > 9 files changed, 543 insertions(+), 112 deletions(-)
> > create mode 100644 Documentation/devicetree/bindings/phy/amlogic,meson-axg-mipi-pcie-analog.yaml
> > create mode 100644 Documentation/devicetree/bindings/phy/amlogic,meson-axg-pcie.yaml
> > create mode 100644 drivers/phy/amlogic/phy-meson-axg-mipi-pcie-analog.c
> > create mode 100644 drivers/phy/amlogic/phy-meson-axg-pcie.c
> >
>
> You forgot to keep the Reviewed-by/Acked-by tags from the previous reviews.
>

Indeed, sorry about that, I have just added them.

--
Remi