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Use double-sized fifo only for IN endpoints

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Michiel van Leeuwen
2023-05-04 10:02:42 +02:00
parent 678edbe203
commit 75cf8e21a7
1 changed files with 6 additions and 4 deletions
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10
src/portable/synopsys/dwc2/dcd_dwc2.c
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@@ -648,10 +648,7 @@ bool dcd_edpt_open (uint8_t rhport, tusb_desc_endpoint_t const * desc_edpt)
xfer->max_size = tu_edpt_packet_size(desc_edpt); xfer->max_size = tu_edpt_packet_size(desc_edpt);
xfer->interval = desc_edpt->bInterval; xfer->interval = desc_edpt->bInterval;
// The fifo-empty interrupt fires when the interrupt is half empty. In order uint16_t fifo_size = tu_div_ceil(xfer->max_size, 4);
// to be able to write a packet at that point, the fifo must be twice the
// max_size.
uint16_t const fifo_size = tu_div_ceil(xfer->max_size * 2, 4);
if(dir == TUSB_DIR_OUT) if(dir == TUSB_DIR_OUT)
{ {
@@ -697,6 +694,11 @@ bool dcd_edpt_open (uint8_t rhport, tusb_desc_endpoint_t const * desc_edpt)
// In FIFO is allocated by following rules: // In FIFO is allocated by following rules:
// - IN EP 1 gets FIFO 1, IN EP "n" gets FIFO "n". // - IN EP 1 gets FIFO 1, IN EP "n" gets FIFO "n".
// The fifo-empty interrupt fires when the interrupt is half empty. In order
// to be able to write a packet at that point, the fifo must be twice the
// max_size.
fifo_size = fifo_size * 2;
// Check if free space is available // Check if free space is available
TU_ASSERT(_allocated_fifo_words_tx + fifo_size + dwc2->grxfsiz <= _dwc2_controller[rhport].ep_fifo_size/4); TU_ASSERT(_allocated_fifo_words_tx + fifo_size + dwc2->grxfsiz <= _dwc2_controller[rhport].ep_fifo_size/4);