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Commit 37e3ee99 authored by Sergei Shtylyov's avatar Sergei Shtylyov Committed by Greg Kroah-Hartman
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musb_gadget: suppress "parasitic" TX interrupts with CPPI 



Suppress "parasitic" endpoint interrupts in the DMA mode
when using CPPI DMA driver; they're caused by the MUSB gadget
driver using the DMA request mode 0 instead of the mode 1.

Signed-off-by: default avatarSergei Shtylyov <sshtylyov@ru.mvista.com>
Signed-off-by: default avatarDavid Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@suse.de>
parent a5073b52

drivers/usb/musb/musb_gadget.c

+2 −1
Original line number Original line Diff line number Diff line
@@ -349,7 +349,8 @@ static void txstate(struct musb *musb, struct musb_request *req) 
#elif defined(CONFIG_USB_TI_CPPI_DMA)

#elif defined(CONFIG_USB_TI_CPPI_DMA)

		/* program endpoint CSR first, then setup DMA */

		/* program endpoint CSR first, then setup DMA */

		csr &= ~(MUSB_TXCSR_P_UNDERRUN | MUSB_TXCSR_TXPKTRDY);

		csr &= ~(MUSB_TXCSR_P_UNDERRUN | MUSB_TXCSR_TXPKTRDY);

		csr |= MUSB_TXCSR_MODE | MUSB_TXCSR_DMAENAB;

		csr |= MUSB_TXCSR_DMAENAB | MUSB_TXCSR_DMAMODE |

		       MUSB_TXCSR_MODE;

		musb_writew(epio, MUSB_TXCSR,

		musb_writew(epio, MUSB_TXCSR,

			(MUSB_TXCSR_P_WZC_BITS & ~MUSB_TXCSR_P_UNDERRUN)

			(MUSB_TXCSR_P_WZC_BITS & ~MUSB_TXCSR_P_UNDERRUN)

				| csr);

				| csr);