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Commit 9187bef2 authored by Geoff Levand's avatar Geoff Levand
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usb: PS3 EHCI HC reset work-around 



PS3 EHCI HC errata fix 316 - The PS3 EHCI HC will reset its
internal INSNREGXX setup regs back to the chip default values
on Host Controller Reset (CMD_RESET) or Light Host Controller
Reset (CMD_LRESET).  The work-around for this is for the HC
driver to re-initialise these regs when ever the HC is reset.

Adds a new helper routine ps3_ehci_setup_insnreg() which is
called from ps3_ehci_hc_reset().

Signed-off-by: default avatarGeoff Levand <geoff@infradead.org>
Acked-by: default avatarAlan Stern <stern@rowland.harvard.edu>
parent 876e0df9

drivers/usb/host/ehci-ps3.c

+30 −0
Original line number Diff line number Diff line
@@ -21,6 +21,34 @@ 
#include <asm/firmware.h>

#include <asm/ps3.h>



static void ps3_ehci_setup_insnreg(struct ehci_hcd *ehci)

{

	/* PS3 HC internal setup register offsets. */



	enum ps3_ehci_hc_insnreg {

		ps3_ehci_hc_insnreg01 = 0x084,

		ps3_ehci_hc_insnreg02 = 0x088,

		ps3_ehci_hc_insnreg03 = 0x08c,

	};



	/* PS3 EHCI HC errata fix 316 - The PS3 EHCI HC will reset its

	 * internal INSNREGXX setup regs back to the chip default values

	 * on Host Controller Reset (CMD_RESET) or Light Host Controller

	 * Reset (CMD_LRESET).  The work-around for this is for the HC

	 * driver to re-initialise these regs when ever the HC is reset.

	 */



	/* Set burst transfer counts to 256 out, 32 in. */



	writel_be(0x01000020, (void __iomem *)ehci->regs +

		ps3_ehci_hc_insnreg01);



	/* Enable burst transfer counts. */



	writel_be(0x00000001, (void __iomem *)ehci->regs +

		ps3_ehci_hc_insnreg03);

}



static int ps3_ehci_hc_reset(struct usb_hcd *hcd)

{

	int result;
@@ -49,6 +77,8 @@ static int ps3_ehci_hc_reset(struct usb_hcd *hcd) 


	ehci_reset(ehci);



	ps3_ehci_setup_insnreg(ehci);



	return result;

}