lantiq: tweak DWC2 default parameters

This patch improves the default configuration of DWC2 on lantiq SoCs
somewhat:
 * Set maximum packet count to largest allowed value by the DWC2 (511)
 * Use 16-bit DMA bursts
 * Divide fifo buffers more evenly

Default fifo buffer sizes from original ltq-hcd driver seem really
irrational. For example according to DWC2 data book rxfifo size of 240
will not fit even a single full length USB packet. On the other hand
non-periodic tx fifo size of 240 is more than enough to fit one complete
packet.

Change the sizes around to improve the situation and to fix some issues
especially with isochronous USB transfers.

Signed-off-by: Antti Seppälä <a.seppala@gmail.com>
SVN-Revision: 47563

diff --git a/target/linux/lantiq/patches-3.18/0041-USB-DWC2-add-ltq-params.patch b/target/linux/lantiq/patches-3.18/0041-USB-DWC2-add-ltq-params.patch
index a0af1236f93a7ca8a81e0b409ed88aedc24995c5..2d9cb0f63f995e3070864aae7f71b72f3b9c71af 100644 (file)
--- a/target/linux/lantiq/patches-3.18/0041-USB-DWC2-add-ltq-params.patch
+++ b/target/linux/lantiq/patches-3.18/0041-USB-DWC2-add-ltq-params.patch
@@ -12,11 +12,11 @@
 +      .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 */
++      .host_rx_fifo_size              = 288,  /* 288 DWORDs */
++      .host_nperio_tx_fifo_size       = 128,  /* 128 DWORDs */
++      .host_perio_tx_fifo_size        = 96,   /* 96 DWORDs */
 +      .max_transfer_size              = -1,
-+      .max_packet_count               = -1,
++      .max_packet_count               = 511,
 +      .host_channels                  = -1,
 +      .phy_type                       = -1,
 +      .phy_utmi_width                 = -1,
@@ -28,7 +28,7 @@
 +      .host_ls_low_power_phy_clk      = -1,
 +      .ts_dline                       = -1,
 +      .reload_ctl                     = -1,
-+      .ahbcfg                         = -1,
++      .ahbcfg                         = GAHBCFG_HBSTLEN_INCR16 << GAHBCFG_HBSTLEN_SHIFT,
 +      .uframe_sched                   = -1,
 +};
 +

diff --git a/target/linux/lantiq/patches-4.1/0041-USB-DWC2-add-ltq-params.patch b/target/linux/lantiq/patches-4.1/0041-USB-DWC2-add-ltq-params.patch
index c55f5b68211e28396b45004dc6de508415e4806a..0b5d09bed23c56e397d1cc3185d0cba9cf68e5d2 100644 (file)
--- a/target/linux/lantiq/patches-4.1/0041-USB-DWC2-add-ltq-params.patch
+++ b/target/linux/lantiq/patches-4.1/0041-USB-DWC2-add-ltq-params.patch
@@ -12,11 +12,11 @@
 +      .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 */
++      .host_rx_fifo_size              = 288,  /* 288 DWORDs */
++      .host_nperio_tx_fifo_size       = 128,  /* 128 DWORDs */
++      .host_perio_tx_fifo_size        = 96,   /* 96 DWORDs */
 +      .max_transfer_size              = -1,
-+      .max_packet_count               = -1,
++      .max_packet_count               = 511,
 +      .host_channels                  = -1,
 +      .phy_type                       = -1,
 +      .phy_utmi_width                 = -1,
@@ -28,7 +28,7 @@
 +      .host_ls_low_power_phy_clk      = -1,
 +      .ts_dline                       = -1,
 +      .reload_ctl                     = -1,
-+      .ahbcfg                         = -1,
++      .ahbcfg                         = GAHBCFG_HBSTLEN_INCR16 << GAHBCFG_HBSTLEN_SHIFT,
 +      .uframe_sched                   = -1,
 +};
 +