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usb: musb: musb_cppi41: Workaround DMA stall issue during teardown

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The DMA may hang up if a teardown is initiated while an endpoint is still
active (Advisory 2.3.27 of DA8xx errata).
To workaround this issue, add a delay before to initiate the teardown.

Signed-off-by: Alexandre Bailon <abailon@baylibre.com>
Signed-off-by: Bin Liu <b-liu@ti.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Alexandre Bailon 2017-04-16 23:21:18 -05:00 committed by Greg Kroah-Hartman
parent d6299b6efb
commit 593bc4622a
3 changed files with 6 additions and 1 deletions
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2
drivers/usb/musb/da8xx.c
View File

@ -483,7 +483,7 @@ da8xx_dma_controller_create(struct musb *musb, void __iomem *base)
static const struct musb_platform_ops da8xx_ops = {
.quirks = MUSB_INDEXED_EP | MUSB_PRESERVE_SESSION |
MUSB_DMA_CPPI41,
MUSB_DMA_CPPI41 | MUSB_DA8XX,
.init = da8xx_musb_init,
.exit = da8xx_musb_exit,

1
drivers/usb/musb/musb_core.h
View File

@ -172,6 +172,7 @@ struct musb_io;
*/
struct musb_platform_ops {
#define MUSB_DA8XX BIT(8)
#define MUSB_PRESERVE_SESSION BIT(7)
#define MUSB_DMA_UX500 BIT(6)
#define MUSB_DMA_CPPI41 BIT(5)

4
drivers/usb/musb/musb_cppi41.c
View File

@ -571,6 +571,10 @@ static int cppi41_dma_channel_abort(struct dma_channel *channel)
}
}
/* DA8xx Advisory 2.3.27: wait 250 ms before to start the teardown */
if (musb->io.quirks & MUSB_DA8XX)
mdelay(250);
tdbit = 1 << cppi41_channel->port_num;
if (is_tx)
tdbit <<= 16;