Hi Geert-san,
(2014/05/19 20:58), Geert Uytterhoeven wrote:
> Hi Shimoda-san,
>
> On Mon, May 19, 2014 at 12:08 PM, Yoshihiro Shimoda
> <yoshihiro.shimoda.uh@xxxxxxxxxxx> wrote:
< snip >
>> +config USB_XHCI_RCAR
>> + tristate "xHCI support for Renesas R-Car SoCs"
>> + select USB_XHCI_PLATFORM
>> + depends on ARCH_SHMOBILE || COMPILE_TEST
>> + ---help---
>> + Say 'Y' to enable the support for the xHCI host controller
>> + found in Renesas R-Car ARM SoCs.
>
> Does R-Car Gen1 also have xHCI, and is it compatible?
> If not, you may want to call this driver USB_XHCI_RCAR2.
R-Car Gen1 doesn't have xHCI.
However, next generation of R-Car may have xHCI. (But, I don't know it is compatible.)
If we call this driver "USB_XHCI_RCAR2", should we also change filename to "xhci-rcar2.[ch]"?
< snip >
>> static int xhci_plat_start(struct usb_hcd *hcd)
>> {
>> + struct device_node *of_node = hcd->self.controller->of_node;
>> +
>> + if (of_device_is_compatible(of_node, "renesas,r8a7790-xhci") ||
>> + of_device_is_compatible(of_node, "renesas,r8a7790-xhci"))
>
> r8a7791, as Magnus already pointed out.
Yes, I will correct this.
>> + xhci_rcar_start(hcd);
>
> If CONFIG_USB_XHCI_RCAR is not defined, xhci_rcar_start() is a dummy
> function, but the of_device_is_compatible() checks will still be compiled in.
>
> Hence perhaps an #ifdef CONFIG_USB_XHCI_RCAR is warranted here,
> possibly combined with inclusion of a C-source file, like is done in
> drivers/usb/host/ohci-hcd.c? It's up to the USB maintainer to decide this,
> though.
This implementation is similar with the following patch. And the patch already got
"Acked-by" from Mathias Nyman of USB XHCI DRIVER's maintainer.
http://marc.info/?l=linux-usb&m=140014933101775&w=2
< snip >
>> @@ -165,6 +172,15 @@ static int xhci_plat_probe(struct platform_device *pdev)
>> goto unmap_registers;
>> }
>>
>> + if (of_device_is_compatible(pdev->dev.of_node,
>> + "renesas,r8a7790-xhci") ||
>> + of_device_is_compatible(pdev->dev.of_node,
>> + "renesas,r8a7791-xhci")) {
>> + ret = xhci_rcar_init_quirk(pdev);
>
> Same here.
>
Same above.
< snip >
>> --- /dev/null
>> +++ b/drivers/usb/host/xhci-rcar.c
>
>> +/* USB3.0 Configuraion */
>
> Configuration
I ran the "aspell -c" command, and I found other 2 typos. ("Initilization" and "Porariy")
So, I will correct these typos.
< snip >
>> + for (index = 0; index < fw->size; index += 4) {
>> + for (data = 0, j = 3; j >= 0; j--) {
>> + if ((j + index) >= fw->size)
>> + continue;
>> + data |= fw->data[index + j] << (8 * j);
>> + }
>
> This is your custom get_unaligned_le32(), to avoid reading beyond the end
> of the buffer if its size is not a multiple of 4 bytes?
Yes, I would like to avoid it.
> Is there some way to just use get_unaligned_le32()?
Yes, I will remove the custom get_unaligned_le32() and add the following code.
Do you think that this code is good?
int i;
u32 data;
u8 buf[4];
< snip >
for (i = 0; i < fw->size; i += 4) {
memset(buf, 0, sizeof(buf));
memcpy(buf, &fw->data[i], min(sizeof(buf), fw->size - i));
data = get_unaligned_le32(buf);
Best regards,
Yoshihiro Shimoda
> If you want to keep it, I would rewrite it as
>
> for (data = 0, j = 3; j >= 0; j--) {
> if ((j + index) < fw->size)
> data |= fw->data[index + j] << (8 * j);
> }
>
> Gr{oetje,eeting}s,
>
> Geert
>
> --
> Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@xxxxxxxxxxxxxx
>
> In personal conversations with technical people, I call myself a hacker. But
> when I'm talking to journalists I just say "programmer" or something like that.
> -- Linus Torval
>
--
Yoshihiro Shimoda
EC No.
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