drivers: udc: stm32: Fix RX FIFO min size

On USB HS, the previous lower limit of 64 is too small, the value 160 has been chosen apparently through trial and error. See 1204aa2 for the original implementation in the old device driver. Signed-off-by: Tobias Pisani <[email protected]>
zephyrproject-rtos · Dec 7, 2024 · 8e6c8ae · 8e6c8ae
1 parent a383276
commit 8e6c8ae
Showing 1 changed file with 2 additions and 2 deletions.
diff --git a/drivers/usb/udc/udc_stm32.c b/drivers/usb/udc/udc_stm32.c
@@ -515,9 +515,9 @@ static void udc_stm32_mem_init(const struct device *dev)
 	}
 
 	/* The documentation is not clear at all about RX FiFo size requirement,
-	 * Allocate a minimum of 0x40 words, which seems to work reliably.
+	 * 160 has been selected through trial and error.
 	 */
-	words = MAX(0x40, cfg->ep_mps / 4);
+	words = MAX(160, cfg->ep_mps / 4);
 	HAL_PCDEx_SetRxFiFo(&priv->pcd, words);
 	priv->occupied_mem = words * 4;