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From: Vidya Sagar <vidyas@nvidia.com>
To: Thierry Reding <thierry.reding@gmail.com>
Cc: mark.rutland@arm.com, devicetree@vger.kernel.org,
	lorenzo.pieralisi@arm.com, mperttunen@nvidia.com,
	mmaddireddy@nvidia.com, linux-pci@vger.kernel.org,
	catalin.marinas@arm.com, will.deacon@arm.com,
	linux-kernel@vger.kernel.org, kthota@nvidia.com, kishon@ti.com,
	linux-tegra@vger.kernel.org, robh+dt@kernel.org,
	gustavo.pimentel@synopsys.com, jingoohan1@gmail.com,
	bhelgaas@google.com, jonathanh@nvidia.com,
	linux-arm-kernel@lists.infradead.org, sagar.tv@gmail.com
Subject: Re: [PATCH V7 02/15] PCI: Disable MSI for Tegra194 root port
Date: Tue, 21 May 2019 22:17:26 +0530
Message-ID: <f63051b0-a220-125b-219e-25156d65ea6d@nvidia.com> (raw)
In-Reply-To: <20190521102729.GB29166@ulmo>

On 5/21/2019 3:57 PM, Thierry Reding wrote:
> On Fri, May 17, 2019 at 06:08:33PM +0530, Vidya Sagar wrote:
>> Tegra194 rootports don't generate MSI interrupts for PME events and hence
>> MSI needs to be disabled for them to avoid root ports service drivers
>> registering their respective ISRs with MSI interrupt.
>>
>> Signed-off-by: Vidya Sagar <vidyas@nvidia.com>
>> ---
>> Changes since [v6]:
>> * This is a new patch
>>
>>   drivers/pci/quirks.c | 14 ++++++++++++++
>>   1 file changed, 14 insertions(+)
>>
>> diff --git a/drivers/pci/quirks.c b/drivers/pci/quirks.c
>> index 0f16acc323c6..28f9a0380df5 100644
>> --- a/drivers/pci/quirks.c
>> +++ b/drivers/pci/quirks.c
>> @@ -2592,6 +2592,20 @@ DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_NVIDIA,
>>   			PCI_DEVICE_ID_NVIDIA_NVENET_15,
>>   			nvenet_msi_disable);
>>   
>> +/*
>> + * Tegra194's PCIe root ports don't generate MSI interrupts for PME events
>> + * instead legacy interrupts are generated. Hence, to avoid service drivers
>> + * registering their respective ISRs for MSIs, need to disable MSI interrupts
>> + * for root ports.
>> + */
>> +static void disable_tegra194_rp_msi(struct pci_dev *dev)
>> +{
>> +	dev->no_msi = 1;
>> +}
>> +DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_NVIDIA, 0x1ad0, disable_tegra194_rp_msi);
>> +DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_NVIDIA, 0x1ad1, disable_tegra194_rp_msi);
>> +DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_NVIDIA, 0x1ad2, disable_tegra194_rp_msi);
>> +
> 
> Later functions in this file seem to use a more consistent naming
> pattern, according to which the name for this would become:
> 
> 	pci_quirk_nvidia_tegra194_disable_rp_msi
> 
> Might be worth considering making this consistent.
> 
> This could also be moved to the DWC driver to restrict this to where it
> is needed. In either case, this seems like a good solution, so:
> 
> Reviewed-by: Thierry Reding <treding@nvidia.com>
> 
Ok. I'll move it to DWC driver along with name change for the quirk API.


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Thread overview: 50+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-05-17 12:38 [PATCH V7 00/15] Add Tegra194 PCIe support Vidya Sagar
2019-05-17 12:38 ` [PATCH V7 01/15] PCI: Add #defines for some of PCIe spec r4.0 features Vidya Sagar
2019-05-17 12:38 ` [PATCH V7 02/15] PCI: Disable MSI for Tegra194 root port Vidya Sagar
2019-05-21 10:27   ` Thierry Reding
2019-05-21 16:47     ` Vidya Sagar [this message]
2019-05-21 19:34       ` Vidya Sagar
2019-05-21 19:36       ` Bjorn Helgaas
2019-05-22  8:07         ` Vidya Sagar
2019-05-17 12:38 ` [PATCH V7 03/15] PCI: dwc: Perform dbi regs write lock towards the end Vidya Sagar
2019-05-21 10:29   ` Thierry Reding
2019-05-17 12:38 ` [PATCH V7 04/15] PCI: dwc: Move config space capability search API Vidya Sagar
2019-05-21 10:29   ` Thierry Reding
2019-05-21 21:17   ` Bjorn Helgaas
2019-05-22  8:56     ` Vidya Sagar
2019-05-22 14:02       ` Bjorn Helgaas
2019-05-24 14:46         ` Vidya Sagar
2019-05-17 12:38 ` [PATCH V7 05/15] PCI: dwc: Add ext " Vidya Sagar
2019-05-21 10:36   ` Thierry Reding
2019-05-21 17:14     ` Vidya Sagar
2019-05-17 12:38 ` [PATCH V7 06/15] dt-bindings: PCI: designware: Add binding for CDM register check Vidya Sagar
2019-05-21 10:37   ` Thierry Reding
2019-05-24 20:23   ` Rob Herring
2019-05-17 12:38 ` [PATCH V7 07/15] PCI: dwc: Add support to enable " Vidya Sagar
2019-05-21 10:38   ` Thierry Reding
2019-05-17 12:38 ` [PATCH V7 08/15] dt-bindings: Add PCIe supports-clkreq property Vidya Sagar
2019-05-21 10:39   ` Thierry Reding
2019-05-17 12:38 ` [PATCH V7 09/15] dt-bindings: PCI: tegra: Add device tree support for Tegra194 Vidya Sagar
2019-05-21 10:51   ` Thierry Reding
2019-05-21 18:00     ` Vidya Sagar
2019-05-24 20:26   ` Rob Herring
2019-05-17 12:38 ` [PATCH V7 10/15] dt-bindings: PHY: P2U: Add Tegra194 P2U block Vidya Sagar
2019-05-21 10:52   ` Thierry Reding
2019-05-17 12:38 ` [PATCH V7 11/15] arm64: tegra: Add P2U and PCIe controller nodes to Tegra194 DT Vidya Sagar
2019-05-17 13:03   ` Ard Biesheuvel
2019-05-17 17:38     ` Vidya Sagar
2019-05-17 12:38 ` [PATCH V7 12/15] arm64: tegra: Enable PCIe slots in P2972-0000 board Vidya Sagar
2019-05-21 10:54   ` Thierry Reding
2019-05-21 18:17     ` Vidya Sagar
2019-05-22 13:48       ` Thierry Reding
2019-05-17 12:38 ` [PATCH V7 13/15] phy: tegra: Add PCIe PIPE2UPHY support Vidya Sagar
2019-05-21 11:00   ` Thierry Reding
2019-05-21 19:37     ` Vidya Sagar
2019-05-21 11:00   ` Thierry Reding
2019-05-22  8:59     ` Vidya Sagar
2019-05-17 12:38 ` [PATCH V7 14/15] PCI: tegra: Add Tegra194 PCIe support Vidya Sagar
2019-05-21 11:41   ` Thierry Reding
2019-05-22 12:05     ` Vidya Sagar
2019-05-22 14:14       ` Thierry Reding
2019-05-24 18:07         ` Vidya Sagar
2019-05-17 12:38 ` [PATCH V7 15/15] arm64: Add Tegra194 PCIe driver to defconfig Vidya Sagar

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