The user can adjust it through dts or platform data
Signed-off-by: Peter Chen <peter.chen@xxxxxxxxxxxxx>
---
drivers/usb/chipidea/bits.h | 4 ++++
drivers/usb/chipidea/ci.h | 1 +
drivers/usb/chipidea/core.c | 35 +++++++++++++++++++++++++++++++++++
include/linux/usb/chipidea.h | 4 ++++
4 files changed, 44 insertions(+)
diff --git a/drivers/usb/chipidea/bits.h b/drivers/usb/chipidea/bits.h
index 462ad02..e462f55 100644
--- a/drivers/usb/chipidea/bits.h
+++ b/drivers/usb/chipidea/bits.h
@@ -61,6 +61,10 @@
/* Set non-zero value for internal TT Hub address representation */
#define TTCTRL_TTHA (0x7fUL << 24)
+/* BURSTSIZE */
+#define RX_BURST_MASK 0xff
+#define TX_BURST_MASK 0xff00
+
/* PORTSC */
#define PORTSC_CCS BIT(0)
#define PORTSC_CSC BIT(1)
diff --git a/drivers/usb/chipidea/ci.h b/drivers/usb/chipidea/ci.h
index b562544..41d7cf6 100644
--- a/drivers/usb/chipidea/ci.h
+++ b/drivers/usb/chipidea/ci.h
@@ -51,6 +51,7 @@ enum ci_hw_regs {
OP_DEVICEADDR,
OP_ENDPTLISTADDR,
OP_TTCTRL,
+ OP_BURSTSIZE,
OP_PORTSC,
OP_DEVLC,
OP_OTGSC,
diff --git a/drivers/usb/chipidea/core.c b/drivers/usb/chipidea/core.c
index bde49f3..3feebf7 100644
--- a/drivers/usb/chipidea/core.c
+++ b/drivers/usb/chipidea/core.c
@@ -86,6 +86,7 @@ static const u8 ci_regs_nolpm[] = {
[OP_DEVICEADDR] = 0x14U,
[OP_ENDPTLISTADDR] = 0x18U,
[OP_TTCTRL] = 0x1CU,
+ [OP_BURSTSIZE] = 0x20U,
[OP_PORTSC] = 0x44U,
[OP_DEVLC] = 0x84U,
[OP_OTGSC] = 0x64U,
@@ -109,6 +110,7 @@ static const u8 ci_regs_lpm[] = {
[OP_DEVICEADDR] = 0x14U,
[OP_ENDPTLISTADDR] = 0x18U,
[OP_TTCTRL] = 0x1CU,
+ [OP_BURSTSIZE] = 0x20U,
[OP_PORTSC] = 0x44U,
[OP_DEVLC] = 0x84U,
[OP_OTGSC] = 0xC4U,
@@ -441,6 +443,17 @@ void ci_platform_configure(struct ci_hdrc *ci)
if (ci->platdata->flags & CI_HDRC_OVERRIDE_AHB_BURST)
hw_write_id_reg(ci, ID_SBUSCFG, AHBBRST_MASK,
ci->platdata->ahb_burst_config);
+
+ /* override burst size, take effect only when ahb_burst_config is 0 */
+ if (!hw_read_id_reg(ci, ID_SBUSCFG, AHBBRST_MASK)) {
+ if (ci->platdata->flags & CI_HDRC_OVERRIDE_TX_BURST)
+ hw_write(ci, OP_BURSTSIZE, TX_BURST_MASK,
+ ci->platdata->tx_burst_size << __ffs(TX_BURST_MASK));
+
+ if (ci->platdata->flags & CI_HDRC_OVERRIDE_RX_BURST)
+ hw_write(ci, OP_BURSTSIZE, RX_BURST_MASK,
+ ci->platdata->rx_burst_size);
+ }
}
/**
@@ -660,6 +673,28 @@ static int ci_get_platdata(struct device *dev,
platdata->flags |= CI_HDRC_OVERRIDE_AHB_BURST;
}
+ if (of_find_property(dev->of_node, "tx-burst-size-dword", NULL)) {
+ ret = of_property_read_u32(dev->of_node, "tx-burst-size-dword",
+ &platdata->tx_burst_size);
+ if (ret) {
+ dev_err(dev,
+ "failed to get tx-burst-size-dword\n");
+ return ret;
+ }
+ platdata->flags |= CI_HDRC_OVERRIDE_TX_BURST;
+ }
+
+ if (of_find_property(dev->of_node, "rx-burst-size-dword", NULL)) {
+ ret = of_property_read_u32(dev->of_node, "rx-burst-size-dword",
+ &platdata->rx_burst_size);
+ if (ret) {
+ dev_err(dev,
+ "failed to get rx-burst-size-dword\n");
+ return ret;
+ }
+ platdata->flags |= CI_HDRC_OVERRIDE_RX_BURST;
+ }
+
return 0;
}
diff --git a/include/linux/usb/chipidea.h b/include/linux/usb/chipidea.h
index fe3c8eb..a41833c 100644
--- a/include/linux/usb/chipidea.h
+++ b/include/linux/usb/chipidea.h
@@ -34,6 +34,8 @@ struct ci_hdrc_platform_data {
#define CI_HDRC_TURN_VBUS_EARLY_ON BIT(7)
#define CI_HDRC_SET_NON_ZERO_TTHA BIT(8)
#define CI_HDRC_OVERRIDE_AHB_BURST BIT(9)
+#define CI_HDRC_OVERRIDE_TX_BURST BIT(10)
+#define CI_HDRC_OVERRIDE_RX_BURST BIT(11)
enum usb_dr_mode dr_mode;
#define CI_HDRC_CONTROLLER_RESET_EVENT 0
#define CI_HDRC_CONTROLLER_STOPPED_EVENT 1
@@ -44,6 +46,8 @@ struct ci_hdrc_platform_data {
/* interrupt threshold setting */
u32 itc_setting;
u32 ahb_burst_config;
+ u32 tx_burst_size;
+ u32 rx_burst_size;
};
/* Default offset of capability registers */
--
1.9.1
--
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