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

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Date:	Fri, 20 Jun 2014 17:17:07 -0400
From:	Murali Karicheri <m-karicheri2@...com>
To:	Mohit KUMAR DCG <Mohit.KUMAR@...com>
CC:	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"linux-doc@...r.kernel.org" <linux-doc@...r.kernel.org>,
	Pratyush ANAND <pratyush.anand@...com>,
	"Shilimkar, Santosh" <santosh.shilimkar@...com>,
	Russell King <linux@....linux.org.uk>,
	Grant Likely <grant.likely@...aro.org>,
	Rob Herring <robh+dt@...nel.org>,
	Jingoo Han <jg1.han@...sung.com>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	Richard Zhu <r65037@...escale.com>,
	"ABRAHAM, KISHON VIJAY" <kishon@...com>,
	Marek Vasut <marex@...x.de>, Arnd Bergmann <arnd@...db.de>,
	Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Kumar Gala <galak@...eaurora.org>,
	Randy Dunlap <rdunlap@...radead.org>
Subject: Re: [PATCH v2 0/8] Add Keystone PCIe controller driver


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@...com]
>> Sent: Wednesday, June 11, 2014 12:21 AM
>> To:linux-arm-kernel@...ts.infradead.org;linux-kernel@...r.kernel.org;
>> linux-pci@...r.kernel.org;devicetree@...r.kernel.org; linux-
>> doc@...r.kernel.org
>> 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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