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SubjectRe: [PATCH v3 5/7] PCI: brcmstb: add MSI capability
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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.

> > - 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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