linux-kernel - [PATCH 0/2] phy: ti-pipe3: Update PCIe PHY settings

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Date:   Mon, 9 Oct 2017 14:33:36 +0530
From:   Kishon Vijay Abraham I <kishon@...com>
To:     Kishon Vijay Abraham I <kishon@...com>,
        Bjorn Helgaas <bhelgaas@...gle.com>
CC:     Roger Quadros <rogerq@...com>, <linux-omap@...r.kernel.org>,
        <linux-pci@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <nsekhar@...com>
Subject: [PATCH 0/2] phy: ti-pipe3: Update PCIe PHY settings

This was supposed to only update ti-pipe3 PHY registers. However because
of the way the ti-pipe3 PHY, OCP2SCP and PCIe controller are connected
in dra7xx where

PCIe controller --------------> ti-pipe3 PHY --------------> OCP2SCP
		  depends on		       depends on

updating ti-pipe3 PHY registers results in an abort.

Though the dependency between ti-pipe3 PHY and OCP2SCP is created
(OCP2SCP is parent of ti-pipe3 PHY), and enabling ti-pipe3 PHY clocks
should in turn enable OCP2SCP (with the help of pm_runtime framework),
this doesn't work in no_irq stage since pm_runtime is disabled during
no_irq stage. Since pci-dra7xx enables/initializes ti-pipe3 phy in
no_irq stage, OCP2SCP is not enabled resulting in an abort with ti-pipe3
PHY registers are accessed.

In order to solve this a functional dependency is created between
PCIe and ti-pipe3 PHY so that PCIe is suspended before PHY/OCP2SCP
and resumed after PCIe PHY/OCP2SCP

Kishon Vijay Abraham I (2):
  PCI: dwc: dra7xx: Create functional dependency between PCIe and PHY
  phy: ti-pipe3: Update pcie phy settings

 drivers/pci/dwc/pci-dra7xx.c  |  16 +++++++
 drivers/phy/ti/phy-ti-pipe3.c | 101 +++++++++++++++++++++++++++++++++++++++++-
 2 files changed, 116 insertions(+), 1 deletion(-)

-- 
2.11.0