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SubjectRe: [PATCH v3 5/7] PCI: brcmstb: add MSI capability
On Mon, Dec 02, 2019 at 10:59:36AM +0100, Nicolas Saenz Julienne wrote:
> Hi Andrew,
>
> On Fri, 2019-11-29 at 15:46 +0000, Andrew Murray wrote:
> > On Tue, Nov 26, 2019 at 10:19:43AM +0100, Nicolas Saenz Julienne wrote:
> > > From: Jim Quinlan <james.quinlan@broadcom.com>
> > >
> > > This adds MSI support to the Broadcom STB PCIe host controller. The MSI
> > > controller is physically located within the PCIe block, however, there
> > > is no reason why the MSI controller could not be moved elsewhere in the
> > > future. MSIX is not supported by the HW.
> > >
> > > Since the internal Brcmstb MSI controller is intertwined with the PCIe
> > > controller, it is not its own platform device but rather part of the
> > > PCIe platform device.
> > >
> > > Signed-off-by: Jim Quinlan <james.quinlan@broadcom.com>
> > > Co-developed-by: Nicolas Saenz Julienne <nsaenzjulienne@suse.de>
> > > Signed-off-by: Nicolas Saenz Julienne <nsaenzjulienne@suse.de>
> > > Reviewed-by: Marc Zyngier <maz@kernel.org>
> > >
> > > ---
> > >
> > > Changes since v2 (kept Marc's Reviewed-by as changes didn't affect irq
> > > subsystem stuff or seem petty enough):
> > > - Use standard APIs on register operations
> > > - Get rid of revision code
> >
> > Do any RPI4's have a HW revision of less than 33?
>
> No, IIRC it's actually revision 34. I had left that bit of code in, following
> the same train of thought as with the of_data on the device-tree part of the
> driver: "It's harmless and should make accomodating other devices easier." It
> turned out not to be such a great approach. Lesson's learned. So I decided to
> remove it.

OK you can add my:

Reviewed-by: Andrew Murray <andrew.murray@arm.com>

Thanks,

Andrew Murray

>
> > > - Update rules to msi_target_addr selection
> > > - Remove unwarranted MSI_FLAG_PCI_MSIX
> > > - Small cosmetic changes
> > >
> > > Changes since v1:cuando tenías tu vacaciones?
> > > - Move revision code and some registers to this patch
> > > - Use PCIE_MSI_IRQ_DOMAIN in Kconfig
> > > - Remove redundant register read from ISR
> > > - Fail probe on MSI init error
> > > - Get rid of msi_internal
> > > - Use bitmap family of functions
> > > - Use edge triggered setup
> > > - Add comment regarding MultiMSI
> > > - Simplify compose_msi_msg to avoid reg read
> > >
> > > This is based on Jim's original submission[1] with some slight changes
> > > regarding how pcie->msi_target_addr is decided.
> > >
> > > [1] https://patchwork.kernel.org/patch/10605955/
> > >
> > > drivers/pci/controller/Kconfig | 1 +
> > > drivers/pci/controller/pcie-brcmstb.c | 261 +++++++++++++++++++++++++-
> > > 2 files changed, 261 insertions(+), 1 deletion(-)
> > >
> > > diff --git a/drivers/pci/controller/Kconfig b/drivers/pci/controller/Kconfig
> > > index 27504f108ee5..918e283bbff1 100644
> > > +
> > > +static void brcm_msi_compose_msi_msg(struct irq_data *data, struct msi_msg
> > > *msg)
> > > +{
> > > + struct brcm_msi *msi = irq_data_get_irq_chip_data(data);
> > > +
> > > + msg->address_lo = lower_32_bits(msi->target_addr);
> > > + msg->address_hi = upper_32_bits(msi->target_addr);
> > > + msg->data = 0x6540 | data->hwirq;
> >
> > NIT: Perhaps this 0x6540 can be a define - just in the same way we have a
> > define
> > for PCIE_MISC_MSI_DATA_CONFIG_VAL.
>
> Noted
>
> Regards,
> Nicolas
>


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