Gupta, Ajay Kumar wrote:
>
> We have observed MSC data read corruption when USB LAN device is
> also connected and it's interface is up.
>
> Silicon team has confirmed an errata where in all the active
> transfers should use FIFO space either in first 8K or next 8K.
> So far we have observed the issue in above use case scenario.
>
> As a workaround to it, adding a new FIFO config (5) fitting well
> within first 8K which can be used for such use cases.
>
> Signed-off-by: Ajay Kumar Gupta <ajay.gupta@xxxxxx>
Long term, do you think the board files should define the
the FIFO configuration table that they want to use (instead of
having different options in musb_core.c)?
For now, this change should be okay (although I don't see a
user now. Or maybe you pass this as a module parameter).
FWIW, this patch is:
Acked-by: Anand Gadiyar <gadiyar@xxxxxx>
> ---
> drivers/usb/musb/musb_core.c | 34 ++++++++++++++++++++++++++++++++++
> 1 files changed, 34 insertions(+), 0 deletions(-)
>
> diff --git a/drivers/usb/musb/musb_core.c b/drivers/usb/musb/musb_core.c
> index bfe08f4..0c8f5ec 100644
> --- a/drivers/usb/musb/musb_core.c
> +++ b/drivers/usb/musb/musb_core.c
> @@ -1095,6 +1095,36 @@ static struct fifo_cfg __initdata mode_4_cfg[] = {
> { .hw_ep_num = 15, .style = FIFO_RXTX, .maxpacket = 1024, },
> };
>
> +/* mode 5 - fits in 8KB */
> +static struct fifo_cfg __initdata mode_5_cfg[] = {
> +{ .hw_ep_num = 1, .style = FIFO_TX, .maxpacket = 512, },
> +{ .hw_ep_num = 1, .style = FIFO_RX, .maxpacket = 512, },
> +{ .hw_ep_num = 2, .style = FIFO_TX, .maxpacket = 512, },
> +{ .hw_ep_num = 2, .style = FIFO_RX, .maxpacket = 512, },
> +{ .hw_ep_num = 3, .style = FIFO_TX, .maxpacket = 512, },
> +{ .hw_ep_num = 3, .style = FIFO_RX, .maxpacket = 512, },
> +{ .hw_ep_num = 4, .style = FIFO_TX, .maxpacket = 512, },
> +{ .hw_ep_num = 4, .style = FIFO_RX, .maxpacket = 512, },
> +{ .hw_ep_num = 5, .style = FIFO_TX, .maxpacket = 512, },
> +{ .hw_ep_num = 5, .style = FIFO_RX, .maxpacket = 512, },
> +{ .hw_ep_num = 6, .style = FIFO_TX, .maxpacket = 32, },
> +{ .hw_ep_num = 6, .style = FIFO_RX, .maxpacket = 32, },
> +{ .hw_ep_num = 7, .style = FIFO_TX, .maxpacket = 32, },
> +{ .hw_ep_num = 7, .style = FIFO_RX, .maxpacket = 32, },
> +{ .hw_ep_num = 8, .style = FIFO_TX, .maxpacket = 32, },
> +{ .hw_ep_num = 8, .style = FIFO_RX, .maxpacket = 32, },
> +{ .hw_ep_num = 9, .style = FIFO_TX, .maxpacket = 32, },
> +{ .hw_ep_num = 9, .style = FIFO_RX, .maxpacket = 32, },
> +{ .hw_ep_num = 10, .style = FIFO_TX, .maxpacket = 32, },
> +{ .hw_ep_num = 10, .style = FIFO_RX, .maxpacket = 32, },
> +{ .hw_ep_num = 11, .style = FIFO_TX, .maxpacket = 32, },
> +{ .hw_ep_num = 11, .style = FIFO_RX, .maxpacket = 32, },
> +{ .hw_ep_num = 12, .style = FIFO_TX, .maxpacket = 32, },
> +{ .hw_ep_num = 12, .style = FIFO_RX, .maxpacket = 32, },
> +{ .hw_ep_num = 13, .style = FIFO_RXTX, .maxpacket = 512, },
> +{ .hw_ep_num = 14, .style = FIFO_RXTX, .maxpacket = 1024, },
> +{ .hw_ep_num = 15, .style = FIFO_RXTX, .maxpacket = 1024, },
> +};
>
> /*
> * configure a fifo; for non-shared endpoints, this may be called
> @@ -1210,6 +1240,10 @@ static int __init ep_config_from_table(struct musb *musb)
> cfg = mode_4_cfg;
> n = ARRAY_SIZE(mode_4_cfg);
> break;
> + case 5:
> + cfg = mode_5_cfg;
> + n = ARRAY_SIZE(mode_5_cfg);
> + break;
> }
>
> printk(KERN_DEBUG "%s: setup fifo_mode %d\n",
> --
> 1.6.2.4
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