On Thu, Jul 19, 2018 at 04:04:34PM +0530, Vignesh R wrote:
> Hi Lorenzo,
>
> On Wednesday 18 July 2018 04:32 PM, Lorenzo Pieralisi wrote:
> > On Wed, Jun 27, 2018 at 05:59:17PM +0530, Vignesh R wrote:
> >> Errata i870 is applicable in both EP and RC mode. Therefore rename
> >> function dra7xx_pcie_ep_unaligned_memaccess(), that implements errata
> >> workaround, to dra7xx_pcie_unaligned_memaccess() and call it from a
> >> common place. So, that errata workaround is applied for both modes of
> >> operation.
> >>
> >> Reported-by: Chris Welch <Chris.Welch@xxxxxxxxxxxxxxxxxx>
> >> Signed-off-by: Vignesh R <vigneshr@xxxxxx>
> >> ---
> >> drivers/pci/controller/dwc/pci-dra7xx.c | 12 ++++++------
> >> 1 file changed, 6 insertions(+), 6 deletions(-)
> >>
> >> diff --git a/drivers/pci/controller/dwc/pci-dra7xx.c b/drivers/pci/controller/dwc/pci-dra7xx.c
> >> index 345aab56ce8b..95d9076e3fde 100644
> >> --- a/drivers/pci/controller/dwc/pci-dra7xx.c
> >> +++ b/drivers/pci/controller/dwc/pci-dra7xx.c
> >> @@ -542,7 +542,7 @@ static const struct of_device_id of_dra7xx_pcie_match[] = {
> >> };
> >>
> >> /*
> >> - * dra7xx_pcie_ep_unaligned_memaccess: workaround for AM572x/AM571x Errata i870
> >> + * dra7xx_pcie_unaligned_memaccess: workaround for AM572x/AM571x Errata i870
> >> * @dra7xx: the dra7xx device where the workaround should be applied
> >> *
> >> * Access to the PCIe slave port that are not 32-bit aligned will result
> >> @@ -552,7 +552,7 @@ static const struct of_device_id of_dra7xx_pcie_match[] = {
> >> *
> >> * To avoid this issue set PCIE_SS1_AXI2OCP_LEGACY_MODE_ENABLE to 1.
> >> */
> >> -static int dra7xx_pcie_ep_unaligned_memaccess(struct device *dev)
> >> +static int dra7xx_pcie_unaligned_memaccess(struct device *dev)
> >> {
> >> int ret;
> >> struct device_node *np = dev->of_node;
> >> @@ -695,6 +695,10 @@ static int __init dra7xx_pcie_probe(struct platform_device *pdev)
> >> if (dra7xx->link_gen < 0 || dra7xx->link_gen > 2)
> >> dra7xx->link_gen = 2;
> >>
> >> + ret = dra7xx_pcie_unaligned_memaccess(dev);
> >> + if (ret)
> >> + dev_err(dev, "WA for Errata i870 not appplied. Update DT\n");
> >
> > Hi Vignesh,
> >
> > Nit: s/appplied/applied
> >
>
> Oops, let me know if you want me to resend with this fixed.
I can fix it, no problem but see below.
> > Two questions:
> >
> > - Current code applies the unaligned_memaccess() workaround for all
> > compatible variants. This is fine for current controllers (since
> > they are all affected), the code path above will have to be
> > reworked if there is any other compatible IP re-using the driver
> > that does not require the workaround.
>
> There are no compatible IPs that don't require this workaround. Also, I
> don't see this IP being re-used in future. If you insist, I can add a
> errata flag
I do not insist, I just pointed this out ;-)
> > - How do you want this series to go upstream ? If it goes via arm-soc,
> > which I think it should, here is my ACK on this patch:
> >
> Patch 1 and 2(dt bindings update and driver patch) can go in via PCI
> tree. And DT changes(patch 3 and 4) can be picked up by Tony via
> omap/arm-soc tree. They are mostly independent and should not cause any
> problems. Does that sound good?
It should be fine but technically as soon as patch (2) is applied we
would have a regression if patches (3) and (4) are applied separately.
You could re-order the series and send everything via arm-soc.
It is not such a big deal, your choice, please let me know.
Thanks,
Lorenzo
> > Acked-by: Lorenzo Pieralisi <lorenzo.pieralisi@xxxxxxx>
> >
>
> Thanks!
>
> > Please let me know if I can drop this series from the PCI patchwork.
> >
> > Thanks,
> > Lorenzo
> >
> >> +
> >> switch (mode) {
> >> case DW_PCIE_RC_TYPE:
> >> if (!IS_ENABLED(CONFIG_PCI_DRA7XX_HOST)) {
> >> @@ -717,10 +721,6 @@ static int __init dra7xx_pcie_probe(struct platform_device *pdev)
> >> dra7xx_pcie_writel(dra7xx, PCIECTRL_TI_CONF_DEVICE_TYPE,
> >> DEVICE_TYPE_EP);
> >>
> >> - ret = dra7xx_pcie_ep_unaligned_memaccess(dev);
> >> - if (ret)
> >> - goto err_gpio;
> >> -
> >> ret = dra7xx_add_pcie_ep(dra7xx, pdev);
> >> if (ret < 0)
> >> goto err_gpio;
> >> --
> >> 2.18.0
> >>
>
> --
> Regards
> Vignesh
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