Re: [PATCH v2 0/8] Add Keystone PCIe controller driver

[Murali Karicheri]

Sorry, my previous response was in html and not sure it has made to the 
list. I did
get an error as well. So resending my response.

On 6/18/2014 6:14 AM, Mohit KUMAR DCG wrote:
> Hello Murali,
>
> > -----Original Message-----
> > From: Murali Karicheri [mailto:m-karicheri2@xxxxxx]
> > Sent: Wednesday, June 11, 2014 12:21 AM
> > To:linux-arm-kernel@xxxxxxxxxxxxxxxxxxx;linux-kernel@xxxxxxxxxxxxxxx;
> > linux-pci@xxxxxxxxxxxxxxx;devicetree@xxxxxxxxxxxxxxx; linux-
> > doc@xxxxxxxxxxxxxxx
> > Cc: Murali Karicheri; Santosh Shilimkar; Russell King; Grant Likely; Rob Herring;
> > Mohit KUMAR DCG; Jingoo Han; Bjorn Helgaas; Pratyush ANAND; Richard
> > Zhu; Kishon Vijay Abraham I; Marek Vasut; Arnd Bergmann; Pawel Moll;
> > Mark Rutland; Ian Campbell; Kumar Gala; Randy Dunlap
> > Subject: [PATCH v2 0/8] Add Keystone PCIe controller driver
> >
> > This patch adds a PCIe controller driver for Keystone SoCs. This is based on v1
> > of the series posted to the mailing list.
> 1. I think your first patch is OK which handles platform specific ATU implementation.
>
> 2. For MSI part, I think you just need to add two new callbacks with pp-ops, something similar to:
> pp->ops->msi_set
>
> pp->ops->msi_clear
>
> With these two platform specific callbacks you should be able to manage MSI handling.
> So idea is that dw_msi code uses pp->ops->msi_set/clear if platform define these,
> otherwise use dw_msi_set/clear (which you need to refactor from existing code)
>
> So other than your keystone changes we expect 3 patches:
> --  1st same as you sent 1/8: for ATU handeling
> -- 2nd to refactor dw_msi_set/clear: refactor from existing code
Mohit,

Thanks for your comments.

Just want to be on the same page

1. In my original patch [PATCH v2 3/8] PCI: designware: update pcie core 
driver to work with dw hw version 3.65.
 I had following changes:-

diff --git a/drivers/pci/host/pcie-designware.c 
b/drivers/pci/host/pcie-designware.c

index e4bd19a..f985811 100644

--- a/drivers/pci/host/pcie-designware.c

+++ b/drivers/pci/host/pcie-designware.c

@@ -277,11 +277,15 @@ static int assign_irq(int no_irqs, struct msi_desc 
*desc, int *pos)

}

set_bit(pos0 + i, pp->msi_irq_in_use);

/*Enable corresponding interrupt in MSI interrupt controller */

-res = ((pos0 + i) / 32) * 12;

-bit = (pos0 + i) % 32;

-dw_pcie_rd_own_conf(pp, PCIE_MSI_INTR0_ENABLE + res, 4, &val);

-val |= 1 << bit;

-dw_pcie_wr_own_conf(pp, PCIE_MSI_INTR0_ENABLE + res, 4, val);

+if (!(pp->version & DW_V3_65)) {

+res = ((pos0 + i) / 32) * 12;

+bit = (pos0 + i) % 32;

+dw_pcie_rd_own_conf(pp, PCIE_MSI_INTR0_ENABLE + res,

+4, &val);

+val |= 1 << bit;

+dw_pcie_wr_own_conf(pp, PCIE_MSI_INTR0_ENABLE + res,

+4, val);

+}

}


I assume you are referring to the above code for msi_set().  I missed to 
add similar code change to clear_irq().

So in assign_irq()

            if (pp->ops->msi_set)
                       pp->ops->msi_set()

Similarly in clear_irq()

            if (pp->ops->msi_clear)
                        pp->ops->msi_clear()


*pos = pos0;

@@ -349,7 +353,10 @@ static int dw_msi_setup_irq(struct msi_chip *chip, 
struct pci_dev *pdev,

*/

desc->msi_attrib.multiple = msgvec;

-msg.address_lo = virt_to_phys((void *)pp->msi_data);

+if (pp->ops->get_msi_data)

+msg.address_lo = pp->ops->get_msi_data(pp);

+else

+msg.address_lo = virt_to_phys((void *)pp->msi_data);

msg.address_hi = 0x0;

msg.data = pos;


What about this code? This requires get_msi_data() as well

> -- 3rd to use pp->ops->msi_set/clear if defined.
Why not API enhancement and refactor the code in a single patch?

Murali
> Pls let us know for any issue or have different opinion.
>
> Regards
> Mohit
>
>
>
>   
> > --
> > 1.7.9.5


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