From mboxrd@z Thu Jan 1 00:00:00 1970 From: tharvey@gateworks.com (Tim Harvey) Date: Thu, 14 Apr 2016 08:13:39 -0700 Subject: [PATCH 2/2] ARM: imx_v6_v7_defconfig: enable PCI_MSI In-Reply-To: <1448902811-11399-2-git-send-email-l.stach@pengutronix.de> References: <1448902811-11399-1-git-send-email-l.stach@pengutronix.de> <1448902811-11399-2-git-send-email-l.stach@pengutronix.de> Message-ID: To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org On Mon, Nov 30, 2015 at 9:00 AM, Lucas Stach wrote: > This has been stable on i.MX6 for a good while now and there is no > reason to keep it disabled, as it allows to allocate non-shared > IRQs if several PCIe devices are connected to a single host. > > Signed-off-by: Lucas Stach > --- > arch/arm/configs/imx_v6_v7_defconfig | 1 + > 1 file changed, 1 insertion(+) > > diff --git a/arch/arm/configs/imx_v6_v7_defconfig b/arch/arm/configs/imx_v6_v7_defconfig > index 4187f69f6630..e2ce60d00e8a 100644 > --- a/arch/arm/configs/imx_v6_v7_defconfig > +++ b/arch/arm/configs/imx_v6_v7_defconfig > @@ -45,6 +45,7 @@ CONFIG_SOC_IMX7D=y > CONFIG_SOC_LS1021A=y > CONFIG_SOC_VF610=y > CONFIG_PCI=y > +CONFIG_PCI_MSI=y > CONFIG_PCI_IMX6=y > CONFIG_SMP=y > CONFIG_PREEMPT_VOLUNTARY=y > -- > 2.6.2 > > > _______________________________________________ > linux-arm-kernel mailing list > linux-arm-kernel at lists.infradead.org > http://lists.infradead.org/mailman/listinfo/linux-arm-kernel Lucas, Any thoughts on why enabling MSI on IMX6 breaks legacy interrupts? Again, many PCI devices/drivers don't support MSI and thus enabling MSI as this patch does makes this config break many PCI devices on IMX6. I have found that MSI does indeed work on the IMX6 for cards/drivers that use MSI, but for those that don't the legacy interrupts never fire regardless of going through a bridge or directly hanging off the IMX6. I assume you can confirm this on your boards/devices as well? Regards, Tim