>
>The mass storage gadget has one IN and one OUT endpoint. The below (Fixes)
>commit aimed to utilize all hardware FIFO to support composited gadget
>devices. This resulted in an ep_buf_size of 15 when a single gadget was
>enabled, such as the mass storage gadget.
>
>However, it was found that there are unknown limitations on the imx8qm and
>imx8qxp B0 platforms. The device would fail to work if ep_buf_size exceeded
>9.
>
>To resolve this issue, this patch reverts to the old settings used before the
>below commit for the imx8qm and imx8qxp B0 platforms.
>
>Fixes: dce49449e04f ("usb: cdns3: allocate TX FIFO size according to
>composite EP number")
>
>Signed-off-by: Frank Li <Frank.Li@xxxxxxx>
>---
>
>I hope cdns engineer, such as pawell@xxxxxxxxxxx help identfy the root
>cause.
>Look like old version ip use more memory then what ep_cfg show.
>
> drivers/usb/cdns3/cdns3-gadget.c | 11 +++++++++++
> 1 file changed, 11 insertions(+)
>
>diff --git a/drivers/usb/cdns3/cdns3-gadget.c b/drivers/usb/cdns3/cdns3-
>gadget.c
>index 5adcb349718c..497c8e87dabf 100644
>--- a/drivers/usb/cdns3/cdns3-gadget.c
>+++ b/drivers/usb/cdns3/cdns3-gadget.c
>@@ -3005,6 +3005,17 @@ static int cdns3_gadget_check_config(struct
>usb_gadget *gadget)
> priv_dev->ep_buf_size = priv_dev->ep_iso_burst =
> (priv_dev->onchip_buffers - 2) / (n_in + 1);
>
>+ /*
>+ * There are unknown hardware limition: when work at super speed
>mode,
>+ * ep_buffer_size can't bigger than 9 for one IN and OUT case at
>i.MX8QM
>+ * and i.MX8QXP B0, which report there are 32k memory.
>+ * Rollback to original settings for the these chipes.
>+ */
>+ if (priv_dev->dev_ver < DEV_VER_V2) {
>+ priv_dev->ep_buf_size = min_t(u8, priv_dev->ep_buf_size, 4);
>+ priv_dev->ep_iso_burst = min_t(u8, priv_dev->ep_iso_burst,
>3);
>+ }
>+
> return 0;
> }
I'm not sure whether you have 32KB. I remember that you had a Soc which have only 18KB on-chip memory
and value in usb_cap2 was incorrect.
It was the reason why the on-chip-buff-size property has been added to driver.
Please confirm that you have 32KB, then I will recreate such test on my testing board.
Regards,
Pawel
>
>--
>2.34.1
