On Fri, Jul 28, 2017 at 05:51:16PM +0200, Michał Mirosław wrote:
> On Fri, Jul 28, 2017 at 01:00:32PM +0300, Dmitry Osipenko wrote:
> > On 28.07.2017 01:32, Michał Mirosław wrote:
> > > On Thu, Jul 27, 2017 at 07:46:07PM +0300, Dmitry Osipenko wrote:
> > >> From: Thierry Reding <treding@xxxxxxxxxx>
> > >>
> > >> All of these Tegra SoC generations have a ChipIdea UDC IP block that can
> > >> be used for device mode communication with a host. Implement rudimentary
> > >> support that doesn't allow switching between host and device modes.
> > >>
> > >> Signed-off-by: Thierry Reding <treding@xxxxxxxxxx>
> > >> [digetx@xxxxxxxxx: rebased patches and added DMA alignment quirk for Tegra20]
> > >> Signed-off-by: Dmitry Osipenko <digetx@xxxxxxxxx>
> > >> Acked-by: Peter Chen <peter.chen@xxxxxxx>
> > >
> > > This works on my Asus TF300T (Tegra3 device). Minor nit below.
> > >
> > > Tested-by: Michał Mirosław <mirq-linux@xxxxxxxxxxxx> (on tf300t)
> > >
> >
> > Nice, thank you!
> >
> > > [...]
> > >> diff --git a/drivers/usb/chipidea/ci_hdrc_tegra.c b/drivers/usb/chipidea/ci_hdrc_tegra.c
> > >> new file mode 100644
> > >> index 000000000000..7814500e71fa
> > >> --- /dev/null
> > >> +++ b/drivers/usb/chipidea/ci_hdrc_tegra.c
> > >> @@ -0,0 +1,160 @@
> > > [...]
> > >> +struct tegra_udc_soc_info {
> > >> + bool supports_unaligned_dma;
> > >> +};
> > > [...]
> > >> +static const struct tegra_udc_soc_info tegra20_udc_soc_info = {
> > >> + .supports_unaligned_dma = false,
> > >> +};
> > >> +
> > >> +static const struct tegra_udc_soc_info tegra30_udc_soc_info = {
> > >> + .supports_unaligned_dma = true,
> > >> +};
> > >> +
> > >> +static const struct tegra_udc_soc_info tegra114_udc_soc_info = {
> > >> + .supports_unaligned_dma = true,
> > >> +};
> > >> +
> > >> +static const struct tegra_udc_soc_info tegra124_udc_soc_info = {
> > >> + .supports_unaligned_dma = true,
> > >> +};
> > >> +
> > >> +static const struct of_device_id tegra_udc_of_match[] = {
> > >> + {
> > >> + .compatible = "nvidia,tegra20-udc",
> > >> + .data = &tegra20_udc_soc_info,
> > >> + }, {
> > >> + .compatible = "nvidia,tegra30-udc",
> > >> + .data = &tegra30_udc_soc_info,
> > >> + }, {
> > >> + .compatible = "nvidia,tegra114-udc",
> > >> + .data = &tegra114_udc_soc_info,
> > >> + }, {
> > >> + .compatible = "nvidia,tegra124-udc",
> > >> + .data = &tegra124_udc_soc_info,
> > >> + }, {
> > >> + /* sentinel */
> > >> + }
> > >> +};
> > >> +MODULE_DEVICE_TABLE(of, tegra_udc_of_match);
> > > [...]
> > >> +static int tegra_udc_probe(struct platform_device *pdev)
> > >> +{
> > > [...]
> > >> + /* setup device specific quirks */
> > >> + soc = id->data;
> > >> +
> > >> + if (!soc->supports_unaligned_dma)
> > >> + udc->data.flags |= CI_HDRC_REQUIRES_ALIGNED_DMA;
> > > [...]
> > >
> > > Some lines would be saved if this was just:
> > >
> > > udc->data.flags |= id->data;
> > >
I prefer this way too, and add CI_HDRC_REQUIRES_ALIGNED_DMA as
platform flags for necessary SoCs.
Peter
> >
> > I think a verbose approach is more preferable and it also more future proof
> > since we may extend soc_info with other stuff later.
>
> I would just leave that to be done when it's needed. :-)
>
> Or you could just have udc_flags in struct tegra_udc_soc_info, so
> that it would not need to be translated - again saving code, bugs
> and future developers' time.
>
> Best Regards,
> Michał Mirosław
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--
Best Regards,
Peter Chen
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