[PATCH V2 RFC 2/6] usb: dwc2: Add DT properties to specify fifo size in host/otg mode

[Stefan Wahren]

Currently the fifo sizes for host/otg mode are defined per platform
and doesn't take the mode into account. So we will get errors
like this:

dwc2 20980000.usb: 256 invalid for host_nperio_tx_fifo_size.
dwc2 20980000.usb: Setting host_nperio_tx_fifo_size to 32

So add DT properties for these mode specific fifo sizes in order
to define them in the devicetree and avoid these errors.

Signed-off-by: Stefan Wahren <stefan.wahren at i2se.com>
---
 Documentation/devicetree/bindings/usb/dwc2.txt |    3 +++
 drivers/usb/dwc2/core.c                        |   25 ++++++++++++++++++------
 2 files changed, 22 insertions(+), 6 deletions(-)

diff --git a/Documentation/devicetree/bindings/usb/dwc2.txt b/Documentation/devicetree/bindings/usb/dwc2.txt
index 20a68bf..298bac1 100644
--- a/Documentation/devicetree/bindings/usb/dwc2.txt
+++ b/Documentation/devicetree/bindings/usb/dwc2.txt
@@ -27,6 +27,9 @@ Refer to phy/phy-bindings.txt for generic phy consumer properties
 - g-rx-fifo-size: size of rx fifo size in gadget mode.
 - g-np-tx-fifo-size: size of non-periodic tx fifo size in gadget mode.
 - g-tx-fifo-size: size of periodic tx fifo per endpoint (except ep0) in gadget mode.
+- h-rx-fifo-size: size of rx fifo size in host / otg mode.
+- h-np-tx-fifo-size: size of non-periodic tx fifo size in host / otg mode.
+- h-tx-fifo-size: size of periodic tx fifo per endpoint (except ep0) in host / otg mode.
 
 Example:
 
diff --git a/drivers/usb/dwc2/core.c b/drivers/usb/dwc2/core.c
index 5645528..5dffc6e 100644
--- a/drivers/usb/dwc2/core.c
+++ b/drivers/usb/dwc2/core.c
@@ -47,6 +47,7 @@
 #include <linux/dma-mapping.h>
 #include <linux/delay.h>
 #include <linux/io.h>
+#include <linux/of.h>
 #include <linux/slab.h>
 #include <linux/usb.h>
 
@@ -1289,6 +1290,9 @@ static void dwc2_set_param_hibernation(struct dwc2_hsotg *hsotg,
 void dwc2_set_parameters(struct dwc2_hsotg *hsotg,
 			 const struct dwc2_core_params *params)
 {
+	struct device_node *np = hsotg->dev->of_node;
+	u32 val = 0;
+
 	dev_dbg(hsotg->dev, "%s()\n", __func__);
 
 	dwc2_set_param_otg_cap(hsotg, params->otg_cap);
@@ -1299,12 +1303,6 @@ void dwc2_set_parameters(struct dwc2_hsotg *hsotg,
 			params->host_support_fs_ls_low_power);
 	dwc2_set_param_enable_dynamic_fifo(hsotg,
 			params->enable_dynamic_fifo);
-	dwc2_set_param_host_rx_fifo_size(hsotg,
-			params->host_rx_fifo_size);
-	dwc2_set_param_host_nperio_tx_fifo_size(hsotg,
-			params->host_nperio_tx_fifo_size);
-	dwc2_set_param_host_perio_tx_fifo_size(hsotg,
-			params->host_perio_tx_fifo_size);
 	dwc2_set_param_max_transfer_size(hsotg,
 			params->max_transfer_size);
 	dwc2_set_param_max_packet_count(hsotg,
@@ -1329,6 +1327,21 @@ void dwc2_set_parameters(struct dwc2_hsotg *hsotg,
 	dwc2_set_param_uframe_sched(hsotg, params->uframe_sched);
 	dwc2_set_param_external_id_pin_ctl(hsotg, params->external_id_pin_ctl);
 	dwc2_set_param_hibernation(hsotg, params->hibernation);
+
+	if (!IS_ENABLED(CONFIG_OF) ||
+	    of_property_read_u32(np, "h-rx-fifo-size", &val))
+		val = params->host_rx_fifo_size;
+	dwc2_set_param_host_rx_fifo_size(hsotg, val);
+
+	if (!IS_ENABLED(CONFIG_OF) ||
+	    of_property_read_u32(np, "h-np-tx-fifo-size", &val))
+		val = params->host_nperio_tx_fifo_size;
+	dwc2_set_param_host_nperio_tx_fifo_size(hsotg, val);
+
+	if (!IS_ENABLED(CONFIG_OF) ||
+	    of_property_read_u32(np, "h-tx-fifo-size", &val))
+		val = params->host_perio_tx_fifo_size;
+	dwc2_set_param_host_perio_tx_fifo_size(hsotg, val);
 }
 
 /*
-- 
1.7.9.5