[+cc Valentine]

Hi Geert,

Thanks a lot for testing this, and sorry for the breakage.

On Tue, Jun 21, 2016 at 12:41:31PM +0200, Geert Uytterhoeven wrote:

On Tue, Jun 7, 2016 at 1:07 AM, Bjorn Helgaas [off-list ref] wrote:

quoted

Request host bridge window resources so they appear in ioport_resource and
iomem_resource and are reflected in /proc/ioports and /proc/iomem.

Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
---
 drivers/pci/host/pci-rcar-gen2.c |    4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/pci/host/pci-rcar-gen2.c b/drivers/pci/host/pci-rcar-gen2.c
index 9980a4b..617a6b2 100644
--- a/drivers/pci/host/pci-rcar-gen2.c
+++ b/drivers/pci/host/pci-rcar-gen2.c

@@ -194,6 +194,7 @@ static int rcar_pci_setup(int nr, struct pci_sys_data *sys)
        struct rcar_pci_priv *priv = sys->private_data;
        void __iomem *reg = priv->reg;
        u32 val;
+       int ret;

        pm_runtime_enable(priv->dev);
        pm_runtime_get_sync(priv->dev);

@@ -275,6 +276,9 @@ static int rcar_pci_setup(int nr, struct pci_sys_data *sys)
        /* Add PCI resources */
        pci_add_resource(&sys->resources, &priv->io_res);
        pci_add_resource(&sys->resources, &priv->mem_res);
+       ret = devm_request_pci_bus_resources(priv->dev, &sys->resources);
+       if (ret < 0)
+               return ret;

        /* Setup bus number based on platform device id / of bus-range */
        sys->busnr = priv->busnr;

This patch (commit 1bd019707b7c9249d34c5d348f1ef75eb4d83e89 in pci/next)
broke PCI on r8a7791/koelsch. Dmesg differences are:

 pci-rcar-gen2 ee090000.pci: PCI: bus0 revision 11
-pci-rcar-gen2 ee090000.pci: PCI host bridge to bus 0000:00
-pci_bus 0000:00: root bus resource [io  0xee080000-0xee0810ff]
-pci_bus 0000:00: root bus resource [mem 0xee080000-0xee0810ff]

This is probably a result of this code in drivers/pci/host/pci-rcar-gen2.c:

        /*
         * The controller does not support/use port I/O,
         * so setup a dummy port I/O region here.
         */
        priv->io_res.start = priv->mem_res.start;
        priv->io_res.end = priv->mem_res.end;
        priv->io_res.flags = IORESOURCE_IO;

We try to avoid adding dummy regions like this, but maybe we missed
this one.  I haven't found any email discussion about it yet, so I
don't know what the reason for this one is.  Valentine, do you
remember?

Can you try the patch below (apply it before the 1bd019707b7c patch
that broke things)?


commit b64dc28f5f2b3afe47ee4a42fb79db84ec4227f8
Author: Bjorn Helgaas [off-list ref]
Date:   Tue Jun 21 09:19:34 2016 -0500

    PCI: rcar: Drop gen2 dummy I/O port region
    
    Previously we added a dummy I/O port region even though the R-Car
    controller doesn't support PCI port I/O.  This resulted in bogus root bus
    resources like this:
    
      pci_bus 0000:00: root bus resource [io  0xee080000-0xee0810ff]
      pci_bus 0000:00: root bus resource [mem 0xee080000-0xee0810ff]
    
    Drop the unused dummy I/O port region.
    
    Signed-off-by: Bjorn Helgaas [off-list ref]

diff --git a/drivers/pci/host/pci-rcar-gen2.c b/drivers/pci/host/pci-rcar-gen2.c
index 9980a4b..53ae619 100644
--- a/drivers/pci/host/pci-rcar-gen2.c
+++ b/drivers/pci/host/pci-rcar-gen2.c

@@ -97,7 +97,6 @@
 struct rcar_pci_priv {
 	struct device *dev;
 	void __iomem *reg;
-	struct resource io_res;
 	struct resource mem_res;
 	struct resource *cfg_res;
 	unsigned busnr;

@@ -273,7 +272,6 @@ static int rcar_pci_setup(int nr, struct pci_sys_data *sys)
 		rcar_pci_setup_errirq(priv);
 
 	/* Add PCI resources */
-	pci_add_resource(&sys->resources, &priv->io_res);
 	pci_add_resource(&sys->resources, &priv->mem_res);
 
 	/* Setup bus number based on platform device id / of bus-range */

@@ -371,14 +369,6 @@ static int rcar_pci_probe(struct platform_device *pdev)
 		return -ENOMEM;
 
 	priv->mem_res = *mem_res;
-	/*
-	 * The controller does not support/use port I/O,
-	 * so setup a dummy port I/O region here.
-	 */
-	priv->io_res.start = priv->mem_res.start;
-	priv->io_res.end = priv->mem_res.end;
-	priv->io_res.flags = IORESOURCE_IO;
-
 	priv->cfg_res = cfg_res;
 
 	priv->irq = platform_get_irq(pdev, 0);