Hi Shawn, John, On 2017/8/7 22:18, John Stultz wrote: > On Sun, Aug 6, 2017 at 10:01 PM, Shawn Guo <shawnguo@xxxxxxxxxx> wrote: >> From: Shawn Guo <shawn.guo@xxxxxxxxxx> >> >> The current usb device g-tx-fifo-size setting in DT causes two problems >> for kernel driver. >> >> 1. On hi6220, there are 15 tx_fifo dedicated for all EPs except EP0, >> while DT only provides tx_fifo settings for 6 EPs. It results in the >> following annoying complaints from kernel. >> >> [ 4.451623] dwc2 f72c0000.usb: dwc2_check_param_tx_fifo_sizes: Invalid parameter g_tx_fifo_size[7]=0 >> [ 4.461303] dwc2 f72c0000.usb: dwc2_check_param_tx_fifo_sizes: Invalid parameter g_tx_fifo_size[8]=0 >> [ 4.470969] dwc2 f72c0000.usb: dwc2_check_param_tx_fifo_sizes: Invalid parameter g_tx_fifo_size[9]=0 >> [ 4.480632] dwc2 f72c0000.usb: dwc2_check_param_tx_fifo_sizes: Invalid parameter g_tx_fifo_size[10]=0 >> [ 4.490385] dwc2 f72c0000.usb: dwc2_check_param_tx_fifo_sizes: Invalid parameter g_tx_fifo_size[11]=0 >> [ 4.500140] dwc2 f72c0000.usb: dwc2_check_param_tx_fifo_sizes: Invalid parameter g_tx_fifo_size[12]=0 >> [ 4.509892] dwc2 f72c0000.usb: dwc2_check_param_tx_fifo_sizes: Invalid parameter g_tx_fifo_size[13]=0 >> [ 4.519646] dwc2 f72c0000.usb: dwc2_check_param_tx_fifo_sizes: Invalid parameter g_tx_fifo_size[14]=0 >> [ 4.529399] dwc2 f72c0000.usb: dwc2_check_param_tx_fifo_sizes: Invalid parameter g_tx_fifo_size[15]=0 >> [ 4.539244] dwc2 f72c0000.usb: EPs: 16, dedicated fifos, 1920 entries in SPRAM >> >> Besides of that, the total 1920 fifo entries isn't fully utilized. >> Endpoint Info Control block consumes 128 entries, g-rx-fifo-size >> is 512, and g-np-tx-fifo-size is 128. So the fifi entries available >> for tx_fifo is: 1920 - 128 - 512 - 128 = 1152. Considering that >> the minimal valid tx_fifo size for each EP is 16, it should be >> reasonable to allocate 1152 entries as: 128 x 8 + 16 x 7 = 1136 (only >> 16 entries unused). With this new setting, we can get more EPs to >> use while removing the above warning messages in the meantime. >> >> 2. Another consequence of above invalid g_tx_fifo_size parameter is that >> kernel driver will use values read from hardware register as the >> fall-back. The value is 2048 for each EP fifo. That's obviously >> invalid either, because even fifo entries for one EP exceeds the >> total entries 1920. That's why we see the following fat warning from >> function dwc2_hsotg_init_fifo(). The new g-tx-fifo-size settings >> help to remove the warning as well. > > > Nice! This has been bothering me for awhile, and your fix seems to > resolve it well! I can now remove one of the hack patches I've been > carrying. > > Tested-by: John Stultz <john.stultz@xxxxxxxxxx> > (if its useful: Acked-by: John Stultz <john.stultz@xxxxxxxxxx>) > > Wei: Can we be sure to get this queued for 4.14? Thanks! Applied to the hisilicon dt tree. Best Regards, Wei > > thanks > -john > > . > -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
