leandrof/linux
1
0
Fork 0
forked from Minki/linux
Code Issues Pull Requests Packages Projects Releases Wiki Activity

usb: cdns3: allocate TX FIFO size according to composite EP number

Browse Source 
Some devices have USB compositions which may require multiple endpoints.
To get better performance, need bigger CDNS3_EP_BUF_SIZE.

But bigger CDNS3_EP_BUF_SIZE may exceed total hardware FIFO size when
multiple endpoints.

By introducing the check_config() callback, calculate CDNS3_EP_BUF_SIZE.

Move CDNS3_EP_BUF_SIZE into cnds3_device: ep_buf_size
Combine CDNS3_EP_ISO_SS_BURST and CDNS3_EP_ISO_HS_MULT into
cnds3_device:ep_iso_burst

Using a simple algorithm to calculate ep_buf_size.
ep_buf_size = ep_iso_burst = (onchip_buffers - 2k) / (number of IN EP +
1).

Test at 8qxp:

	Gadget			ep_buf_size

	RNDIS:				5
	RNDIS+ACM:			3
	Mass Storage + NCM + ACM	2

Previous CDNS3_EP_BUF_SIZE is 4, RNDIS + ACM will be failure because
exceed FIFO memory.

Acked-by: Peter Chen <peter.chen@kernel.org>
Signed-off-by: Frank Li <Frank.Li@nxp.com>
Link: https://lore.kernel.org/r/20220509164055.1815081-1-Frank.Li@nxp.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Frank Li 2022-05-09 11:40:55 -05:00 committed by Greg Kroah-Hartman
parent 9d778f0c5f
commit dce49449e0
2 changed files with 49 additions and 7 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

47
drivers/usb/cdns3/cdns3-gadget.c
View File

@ -2038,7 +2038,7 @@ int cdns3_ep_config(struct cdns3_endpoint *priv_ep, bool enable)
u8 mult = 0;
int ret;
buffering = CDNS3_EP_BUF_SIZE - 1;
buffering = priv_dev->ep_buf_size - 1;
cdns3_configure_dmult(priv_dev, priv_ep);
@ -2057,7 +2057,7 @@ int cdns3_ep_config(struct cdns3_endpoint *priv_ep, bool enable)
break;
default:
ep_cfg = EP_CFG_EPTYPE(USB_ENDPOINT_XFER_ISOC);
mult = CDNS3_EP_ISO_HS_MULT - 1;
mult = priv_dev->ep_iso_burst - 1;
buffering = mult + 1;
}
@ -2073,14 +2073,14 @@ int cdns3_ep_config(struct cdns3_endpoint *priv_ep, bool enable)
mult = 0;
max_packet_size = 1024;
if (priv_ep->type == USB_ENDPOINT_XFER_ISOC) {
maxburst = CDNS3_EP_ISO_SS_BURST - 1;
maxburst = priv_dev->ep_iso_burst - 1;
buffering = (mult + 1) *
(maxburst + 1);
if (priv_ep->interval > 1)
buffering++;
} else {
maxburst = CDNS3_EP_BUF_SIZE - 1;
maxburst = priv_dev->ep_buf_size - 1;
}
break;
default:
@ -2095,6 +2095,10 @@ int cdns3_ep_config(struct cdns3_endpoint *priv_ep, bool enable)
else
priv_ep->trb_burst_size = 16;
mult = min_t(u8, mult, EP_CFG_MULT_MAX);
buffering = min_t(u8, buffering, EP_CFG_BUFFERING_MAX);
maxburst = min_t(u8, maxburst, EP_CFG_MAXBURST_MAX);
/* onchip buffer is only allocated before configuration */
if (!priv_dev->hw_configured_flag) {
ret = cdns3_ep_onchip_buffer_reserve(priv_dev, buffering + 1,
@ -2961,6 +2965,40 @@ static int cdns3_gadget_udc_stop(struct usb_gadget *gadget)
return 0;
}
/**
* cdns3_gadget_check_config - ensure cdns3 can support the USB configuration
* @gadget: pointer to the USB gadget
*
* Used to record the maximum number of endpoints being used in a USB composite
* device. (across all configurations) This is to be used in the calculation
* of the TXFIFO sizes when resizing internal memory for individual endpoints.
* It will help ensured that the resizing logic reserves enough space for at
* least one max packet.
*/
static int cdns3_gadget_check_config(struct usb_gadget *gadget)
{
struct cdns3_device *priv_dev = gadget_to_cdns3_device(gadget);
struct usb_ep *ep;
int n_in = 0;
int total;
list_for_each_entry(ep, &gadget->ep_list, ep_list) {
if (ep->claimed && (ep->address & USB_DIR_IN))
n_in++;
}
/* 2KB are reserved for EP0, 1KB for out*/
total = 2 + n_in + 1;
if (total > priv_dev->onchip_buffers)
return -ENOMEM;
priv_dev->ep_buf_size = priv_dev->ep_iso_burst =
(priv_dev->onchip_buffers - 2) / (n_in + 1);
return 0;
}
static const struct usb_gadget_ops cdns3_gadget_ops = {
.get_frame = cdns3_gadget_get_frame,
.wakeup = cdns3_gadget_wakeup,
@ -2969,6 +3007,7 @@ static const struct usb_gadget_ops cdns3_gadget_ops = {
.udc_start = cdns3_gadget_udc_start,
.udc_stop = cdns3_gadget_udc_stop,
.match_ep = cdns3_gadget_match_ep,
.check_config = cdns3_gadget_check_config,
};
static void cdns3_free_all_eps(struct cdns3_device *priv_dev)

9
drivers/usb/cdns3/cdns3-gadget.h
View File

@ -562,15 +562,18 @@ struct cdns3_usb_regs {
/* Max burst size (used only in SS mode). */
#define EP_CFG_MAXBURST_MASK GENMASK(11, 8)
#define EP_CFG_MAXBURST(p) (((p) << 8) & EP_CFG_MAXBURST_MASK)
#define EP_CFG_MAXBURST_MAX 15
/* ISO max burst. */
#define EP_CFG_MULT_MASK GENMASK(15, 14)
#define EP_CFG_MULT(p) (((p) << 14) & EP_CFG_MULT_MASK)
#define EP_CFG_MULT_MAX 2
/* ISO max burst. */
#define EP_CFG_MAXPKTSIZE_MASK GENMASK(26, 16)
#define EP_CFG_MAXPKTSIZE(p) (((p) << 16) & EP_CFG_MAXPKTSIZE_MASK)
/* Max number of buffered packets. */
#define EP_CFG_BUFFERING_MASK GENMASK(31, 27)
#define EP_CFG_BUFFERING(p) (((p) << 27) & EP_CFG_BUFFERING_MASK)
#define EP_CFG_BUFFERING_MAX 15
/* EP_CMD - bitmasks */
/* Endpoint reset. */
@ -1094,9 +1097,6 @@ struct cdns3_trb {
#define CDNS3_ENDPOINTS_MAX_COUNT 32
#define CDNS3_EP_ZLP_BUF_SIZE 1024
#define CDNS3_EP_BUF_SIZE 4 /* KB */
#define CDNS3_EP_ISO_HS_MULT 3
#define CDNS3_EP_ISO_SS_BURST 3
#define CDNS3_MAX_NUM_DESCMISS_BUF 32
#define CDNS3_DESCMIS_BUF_SIZE 2048 /* Bytes */
#define CDNS3_WA2_NUM_BUFFERS 128
@ -1333,6 +1333,9 @@ struct cdns3_device {
/*in KB */
u16 onchip_buffers;
u16 onchip_used_size;
u16 ep_buf_size;
u16 ep_iso_burst;
};
void cdns3_set_register_bit(void __iomem *ptr, u32 mask);