From patchwork Thu Jan 23 23:29:36 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Remi Pommarel X-Patchwork-Id: 1228607 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Authentication-Results: ozlabs.org; spf=none (no SPF record) smtp.mailfrom=vger.kernel.org (client-ip=209.132.180.67; helo=vger.kernel.org; envelope-from=linux-pci-owner@vger.kernel.org; receiver=) Authentication-Results: ozlabs.org; dmarc=none (p=none dis=none) header.from=triplefau.lt Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by ozlabs.org (Postfix) with ESMTP id 483dZq656jz9sP6 for ; Fri, 24 Jan 2020 10:21:55 +1100 (AEDT) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729782AbgAWXVy (ORCPT ); Thu, 23 Jan 2020 18:21:54 -0500 Received: from relay1-d.mail.gandi.net ([217.70.183.193]:62739 "EHLO relay1-d.mail.gandi.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729274AbgAWXVy (ORCPT ); Thu, 23 Jan 2020 18:21:54 -0500 X-Originating-IP: 88.190.179.123 Received: from localhost (unknown [88.190.179.123]) (Authenticated sender: repk@triplefau.lt) by relay1-d.mail.gandi.net (Postfix) with ESMTPSA id 5ED7E240002; Thu, 23 Jan 2020 23:21:49 +0000 (UTC) From: Remi Pommarel To: Kishon Vijay Abraham I , Yue Wang , Kevin Hilman , Lorenzo Pieralisi , Bjorn Helgaas , Neil Armstrong , Martin Blumenstingl , Rob Herring Cc: Jerome Brunet , linux-amlogic@lists.infradead.org, linux-kernel@vger.kernel.org, devicetree@vger.kernel.org, linux-pci@vger.kernel.org, Remi Pommarel Subject: [PATCH v6 0/7] PCI: amlogic: Make PCIe working reliably on AXG platforms Date: Fri, 24 Jan 2020 00:29:36 +0100 Message-Id: <20200123232943.10229-1-repk@triplefau.lt> X-Mailer: git-send-email 2.24.1 MIME-Version: 1.0 Sender: linux-pci-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-pci@vger.kernel.org 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