diff options
Diffstat (limited to 'drivers/usb/gadget/function/f_uac2.c')
| -rw-r--r-- | drivers/usb/gadget/function/f_uac2.c | 126 |
1 files changed, 85 insertions, 41 deletions
diff --git a/drivers/usb/gadget/function/f_uac2.c b/drivers/usb/gadget/function/f_uac2.c index 34bb6c9a9023..48d6fb26bb19 100644 --- a/drivers/usb/gadget/function/f_uac2.c +++ b/drivers/usb/gadget/function/f_uac2.c @@ -664,29 +664,11 @@ static int get_max_srate(const int *srates) return max_srate; } -static int set_ep_max_packet_size(const struct f_uac2_opts *uac2_opts, - struct usb_endpoint_descriptor *ep_desc, - enum usb_device_speed speed, bool is_playback) +static int get_max_bw_for_bint(const struct f_uac2_opts *uac2_opts, + u8 bint, unsigned int factor, bool is_playback) { int chmask, srate, ssize; - u16 max_size_bw, max_size_ep; - unsigned int factor; - - switch (speed) { - case USB_SPEED_FULL: - max_size_ep = 1023; - factor = 1000; - break; - - case USB_SPEED_HIGH: - case USB_SPEED_SUPER: - max_size_ep = 1024; - factor = 8000; - break; - - default: - return -EINVAL; - } + u16 max_size_bw; if (is_playback) { chmask = uac2_opts->p_chmask; @@ -704,14 +686,76 @@ static int set_ep_max_packet_size(const struct f_uac2_opts *uac2_opts, srate = srate * (1000 + uac2_opts->fb_max) / 1000; // updated srate is always bigger, therefore DIV_ROUND_UP always yields +1 max_size_bw = num_channels(chmask) * ssize * - (DIV_ROUND_UP(srate, factor / (1 << (ep_desc->bInterval - 1)))); + (DIV_ROUND_UP(srate, factor / (1 << (bint - 1)))); } else { // adding 1 frame provision for Win10 max_size_bw = num_channels(chmask) * ssize * - (DIV_ROUND_UP(srate, factor / (1 << (ep_desc->bInterval - 1))) + 1); + (DIV_ROUND_UP(srate, factor / (1 << (bint - 1))) + 1); } - ep_desc->wMaxPacketSize = cpu_to_le16(min_t(u16, max_size_bw, - max_size_ep)); + return max_size_bw; +} + +static int set_ep_max_packet_size_bint(struct device *dev, const struct f_uac2_opts *uac2_opts, + struct usb_endpoint_descriptor *ep_desc, + enum usb_device_speed speed, bool is_playback) +{ + u16 max_size_bw, max_size_ep; + u8 bint, opts_bint; + char *dir; + + switch (speed) { + case USB_SPEED_FULL: + max_size_ep = 1023; + // fixed + bint = ep_desc->bInterval; + max_size_bw = get_max_bw_for_bint(uac2_opts, bint, 1000, is_playback); + break; + + case USB_SPEED_HIGH: + case USB_SPEED_SUPER: + max_size_ep = 1024; + if (is_playback) + opts_bint = uac2_opts->p_hs_bint; + else + opts_bint = uac2_opts->c_hs_bint; + + if (opts_bint > 0) { + /* fixed bint */ + bint = opts_bint; + max_size_bw = get_max_bw_for_bint(uac2_opts, bint, 8000, is_playback); + } else { + /* checking bInterval from 4 to 1 whether the required bandwidth fits */ + for (bint = 4; bint > 0; --bint) { + max_size_bw = get_max_bw_for_bint( + uac2_opts, bint, 8000, is_playback); + if (max_size_bw <= max_size_ep) + break; + } + } + break; + + default: + return -EINVAL; + } + + if (is_playback) + dir = "Playback"; + else + dir = "Capture"; + + if (max_size_bw <= max_size_ep) + dev_dbg(dev, + "%s: Will use maxpctksize %d and bInterval %d\n", + dir, max_size_bw, bint); + else { + dev_warn(dev, + "%s: Req. maxpcktsize %d at bInterval %d > max ISOC %d, may drop data!\n", + dir, max_size_bw, bint, max_size_ep); + max_size_bw = max_size_ep; + } + + ep_desc->wMaxPacketSize = cpu_to_le16(max_size_bw); + ep_desc->bInterval = bint; return 0; } @@ -965,13 +1009,13 @@ static int afunc_validate_opts(struct g_audio *agdev, struct device *dev) return -EINVAL; } - if ((opts->p_hs_bint < 1) || (opts->p_hs_bint > 4)) { - dev_err(dev, "Error: incorrect playback HS/SS bInterval (1-4)\n"); + if ((opts->p_hs_bint < 0) || (opts->p_hs_bint > 4)) { + dev_err(dev, "Error: incorrect playback HS/SS bInterval (1-4: fixed, 0: auto)\n"); return -EINVAL; } - if ((opts->c_hs_bint < 1) || (opts->c_hs_bint > 4)) { - dev_err(dev, "Error: incorrect capture HS/SS bInterval (1-4)\n"); + if ((opts->c_hs_bint < 0) || (opts->c_hs_bint > 4)) { + dev_err(dev, "Error: incorrect capture HS/SS bInterval (1-4: fixed, 0: auto)\n"); return -EINVAL; } @@ -1141,43 +1185,43 @@ afunc_bind(struct usb_configuration *cfg, struct usb_function *fn) ss_epout_desc.bInterval = uac2_opts->c_hs_bint; /* Calculate wMaxPacketSize according to audio bandwidth */ - ret = set_ep_max_packet_size(uac2_opts, &fs_epin_desc, USB_SPEED_FULL, - true); + ret = set_ep_max_packet_size_bint(dev, uac2_opts, &fs_epin_desc, + USB_SPEED_FULL, true); if (ret < 0) { dev_err(dev, "%s:%d Error!\n", __func__, __LINE__); return ret; } - ret = set_ep_max_packet_size(uac2_opts, &fs_epout_desc, USB_SPEED_FULL, - false); + ret = set_ep_max_packet_size_bint(dev, uac2_opts, &fs_epout_desc, + USB_SPEED_FULL, false); if (ret < 0) { dev_err(dev, "%s:%d Error!\n", __func__, __LINE__); return ret; } - ret = set_ep_max_packet_size(uac2_opts, &hs_epin_desc, USB_SPEED_HIGH, - true); + ret = set_ep_max_packet_size_bint(dev, uac2_opts, &hs_epin_desc, + USB_SPEED_HIGH, true); if (ret < 0) { dev_err(dev, "%s:%d Error!\n", __func__, __LINE__); return ret; } - ret = set_ep_max_packet_size(uac2_opts, &hs_epout_desc, USB_SPEED_HIGH, - false); + ret = set_ep_max_packet_size_bint(dev, uac2_opts, &hs_epout_desc, + USB_SPEED_HIGH, false); if (ret < 0) { dev_err(dev, "%s:%d Error!\n", __func__, __LINE__); return ret; } - ret = set_ep_max_packet_size(uac2_opts, &ss_epin_desc, USB_SPEED_SUPER, - true); + ret = set_ep_max_packet_size_bint(dev, uac2_opts, &ss_epin_desc, + USB_SPEED_SUPER, true); if (ret < 0) { dev_err(dev, "%s:%d Error!\n", __func__, __LINE__); return ret; } - ret = set_ep_max_packet_size(uac2_opts, &ss_epout_desc, USB_SPEED_SUPER, - false); + ret = set_ep_max_packet_size_bint(dev, uac2_opts, &ss_epout_desc, + USB_SPEED_SUPER, false); if (ret < 0) { dev_err(dev, "%s:%d Error!\n", __func__, __LINE__); return ret; |