[PATCH 2/2] usb: dwc2: Add default fifo sizes for Lantiq SoCs

[Antti Seppälä]

Lantiq SoCs define the total_fifo_size to be 552 dwords which is too
small for algorithm in dwc2_calculate_dynamic_fifo to work properly.

This patch provides sensible defaults for fifo sizes for Lantiq SoCs
to be used in dwc2 driver. The default values are taken from original
ifx-hcd driver.

Signed-off-by: Antti Seppälä <a.sepp...@gmail.com>
Signed-off-by: Vincent Pelletier <plr.vinc...@gmail.com>
---
 Documentation/devicetree/bindings/usb/dwc2.txt |  1 +
 drivers/usb/dwc2/platform.c                    | 29 ++++++++++++++++++++++++++
 2 files changed, 30 insertions(+)

diff --git a/Documentation/devicetree/bindings/usb/dwc2.txt 
b/Documentation/devicetree/bindings/usb/dwc2.txt
index fd132cb..9182a9f 100644
--- a/Documentation/devicetree/bindings/usb/dwc2.txt
+++ b/Documentation/devicetree/bindings/usb/dwc2.txt
@@ -7,6 +7,7 @@ Required properties:
   - rockchip,rk3066-usb: The DWC2 USB controller instance in the rk3066 Soc;
   - "rockchip,rk3188-usb", "rockchip,rk3066-usb", "snps,dwc2": for rk3188 Soc;
   - "rockchip,rk3288-usb", "rockchip,rk3066-usb", "snps,dwc2": for rk3288 Soc;
+  - "lantiq,dwc2": DWC2 USB controllers found in Lantiq SoCs;
   - snps,dwc2: A generic DWC2 USB controller with default parameters.
 - reg : Should contain 1 register range (address and length)
 - interrupts : Should contain 1 interrupt
diff --git a/drivers/usb/dwc2/platform.c b/drivers/usb/dwc2/platform.c
index ae095f0..99d6b60 100644
--- a/drivers/usb/dwc2/platform.c
+++ b/drivers/usb/dwc2/platform.c
@@ -106,6 +106,34 @@ static const struct dwc2_core_params params_rk3066 = {
        .uframe_sched                   = -1,
 };
 
+static const struct dwc2_core_params params_ltq = {
+       .otg_cap                        = -1,
+       .otg_ver                        = -1,
+       .dma_enable                     = -1,
+       .dma_desc_enable                = -1,
+       .speed                          = -1,
+       .enable_dynamic_fifo            = -1,
+       .en_multiple_tx_fifo            = -1,
+       .host_rx_fifo_size              = 240,  /* 240 DWORDs */
+       .host_nperio_tx_fifo_size       = 240,  /* 240 DWORDs */
+       .host_perio_tx_fifo_size        = 32,   /* 32 DWORDs */
+       .max_transfer_size              = -1,
+       .max_packet_count               = -1,
+       .host_channels                  = -1,
+       .phy_type                       = -1,
+       .phy_utmi_width                 = -1,
+       .phy_ulpi_ddr                   = -1,
+       .phy_ulpi_ext_vbus              = -1,
+       .i2c_enable                     = -1,
+       .ulpi_fs_ls                     = -1,
+       .host_support_fs_ls_low_power   = -1,
+       .host_ls_low_power_phy_clk      = -1,
+       .ts_dline                       = -1,
+       .reload_ctl                     = -1,
+       .ahbcfg                         = -1,
+       .uframe_sched                   = -1,
+};
+
 /**
  * dwc2_driver_remove() - Called when the DWC_otg core is unregistered with the
  * DWC_otg driver
@@ -130,6 +158,7 @@ static int dwc2_driver_remove(struct platform_device *dev)
 static const struct of_device_id dwc2_of_match_table[] = {
        { .compatible = "brcm,bcm2835-usb", .data = &params_bcm2835 },
        { .compatible = "rockchip,rk3066-usb", .data = &params_rk3066 },
+       { .compatible = "lantiq,dwc2", .data = &params_ltq },
        { .compatible = "snps,dwc2", .data = NULL },
        { .compatible = "samsung,s3c6400-hsotg", .data = NULL},
        {},
-- 
2.0.5

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