Some USB sticks cannot handle SIZE_MAX bytes (65535) blocks transfer,
leading to 'EHCI timed out on TD' errors.
As it is hardly predictable, this commit adds a configuration option
to easily reduce this EHCI max transfer size. The default value is 65535
which corresponds to size_t max value (SIZE_MAX).
Signed-off-by: Gilles DOFFE <gilles.do...@savoirfairelinux.com>
---
drivers/usb/host/Kconfig | 7 +++++++
drivers/usb/host/ehci-hcd.c | 2 +-
2 files changed, 8 insertions(+), 1 deletion(-)
diff --git a/drivers/usb/host/Kconfig b/drivers/usb/host/Kconfig
index 30c6b69be8..62054c9c7a 100644
--- a/drivers/usb/host/Kconfig
+++ b/drivers/usb/host/Kconfig
@@ -222,6 +222,13 @@ config USB_EHCI_FSL
select CONFIG_EHCI_HCD_INIT_AFTER_RESET
---help---
Enables support for the on-chip EHCI controller on FSL chips.
+
+config USB_EHCI_MAX_XFER_SIZE
+ int "USB EHCI max transfer size. The default value is 65535 which
+ corresponds to size_t max value (SIZE_MAX)."
+ default 65535
+ range 1 65535
+
endif # USB_EHCI_HCD
config USB_OHCI_HCD
diff --git a/drivers/usb/host/ehci-hcd.c b/drivers/usb/host/ehci-hcd.c
index 61a61abb21..8be1319079 100644
--- a/drivers/usb/host/ehci-hcd.c
+++ b/drivers/usb/host/ehci-hcd.c
@@ -1614,7 +1614,7 @@ static int ehci_get_max_xfer_size(struct udevice *dev,
size_t *size)
* EHCD can handle any transfer length as long as there is enough
* free heap space left, hence set the theoretical max number here.
*/
- *size = SIZE_MAX;
+ *size = CONFIG_USB_EHCI_MAX_XFER_SIZE;
return 0;
}
--
2.20.1
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