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authorHayes Wang <hayeswang@realtek.com>2021-04-16 16:04:32 +0800
committerDavid S. Miller <davem@davemloft.net>2021-04-16 15:28:31 -0700
commit5133bcc7481528e36fff0a3b056601efb704fb32 (patch)
treeeaec0c61efc5afd9f62a0cceeb0361fe765f0147
parentc5d66587b8900201e1530b7c18d41e87bd5812f4 (diff)
r8152: set inter fram gap time depending on speed
Set the maximum inter frame gap time (144ns) for speed 10M/half and 100M/half. It improves the performance for those speeds. And, there is no effect for the other speeds. For 10M/half and 100M/half, the fast inter frame gap time let the device couldn't use the feature of the aggregation effectively, because the transfer would be completed fastly. Therefore, use the maximum value to improve the effect of the aggregation. However, you may not feel the improvement for fast CPUs, because they compensate for the effect of the aggregation. Signed-off-by: Hayes Wang <hayeswang@realtek.com> Signed-off-by: David S. Miller <davem@davemloft.net>
-rw-r--r--drivers/net/usb/r8152.c28
1 files changed, 28 insertions, 0 deletions
diff --git a/drivers/net/usb/r8152.c b/drivers/net/usb/r8152.c
index 20fb5638ac65..10db48f4ed77 100644
--- a/drivers/net/usb/r8152.c
+++ b/drivers/net/usb/r8152.c
@@ -249,6 +249,9 @@
/* PLA_TCR1 */
#define VERSION_MASK 0x7cf0
+#define IFG_MASK (BIT(3) | BIT(9) | BIT(8))
+#define IFG_144NS BIT(9)
+#define IFG_96NS (BIT(9) | BIT(8))
/* PLA_MTPS */
#define MTPS_JUMBO (12 * 1024 / 64)
@@ -2747,6 +2750,29 @@ static int rtl_stop_rx(struct r8152 *tp)
return 0;
}
+static void rtl_set_ifg(struct r8152 *tp, u16 speed)
+{
+ u32 ocp_data;
+
+ ocp_data = ocp_read_word(tp, MCU_TYPE_PLA, PLA_TCR1);
+ ocp_data &= ~IFG_MASK;
+ if ((speed & (_10bps | _100bps)) && !(speed & FULL_DUP)) {
+ ocp_data |= IFG_144NS;
+ ocp_write_word(tp, MCU_TYPE_PLA, PLA_TCR1, ocp_data);
+
+ ocp_data = ocp_read_word(tp, MCU_TYPE_PLA, PLA_MAC_PWR_CTRL4);
+ ocp_data &= ~TX10MIDLE_EN;
+ ocp_write_word(tp, MCU_TYPE_PLA, PLA_MAC_PWR_CTRL4, ocp_data);
+ } else {
+ ocp_data |= IFG_96NS;
+ ocp_write_word(tp, MCU_TYPE_PLA, PLA_TCR1, ocp_data);
+
+ ocp_data = ocp_read_word(tp, MCU_TYPE_PLA, PLA_MAC_PWR_CTRL4);
+ ocp_data |= TX10MIDLE_EN;
+ ocp_write_word(tp, MCU_TYPE_PLA, PLA_MAC_PWR_CTRL4, ocp_data);
+ }
+}
+
static inline void r8153b_rx_agg_chg_indicate(struct r8152 *tp)
{
ocp_write_byte(tp, MCU_TYPE_USB, USB_UPT_RXDMA_OWN,
@@ -2850,6 +2876,8 @@ static int rtl8153_enable(struct r8152 *tp)
r8153_set_rx_early_timeout(tp);
r8153_set_rx_early_size(tp);
+ rtl_set_ifg(tp, rtl8152_get_speed(tp));
+
if (tp->version == RTL_VER_09) {
u32 ocp_data;