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Subject[PATCH net v2 5/9] r8152: Disable PLA MCU clock speed down
Date
PLA MCU clock speed down could only be enabled when tx/rx are disabled.
Otherwise, the packet lost may occur.

Signed-off-by: Hayes Wang <hayeswang@realtek.com>
---
drivers/net/usb/r8152.c | 17 +++++++++++++++++
1 file changed, 17 insertions(+)

diff --git a/drivers/net/usb/r8152.c b/drivers/net/usb/r8152.c
index bc6b2f8aaa7e..1fb85c79bd33 100644
--- a/drivers/net/usb/r8152.c
+++ b/drivers/net/usb/r8152.c
@@ -324,6 +324,7 @@
#define MAC_CLK_SPDWN_EN BIT(15)

/* PLA_MAC_PWR_CTRL3 */
+#define PLA_MCU_SPDWN_EN BIT(14)
#define PKT_AVAIL_SPDWN_EN 0x0100
#define SUSPEND_SPDWN_EN 0x0004
#define U1U2_SPDWN_EN 0x0002
@@ -5005,6 +5006,8 @@ static void rtl8153_down(struct r8152 *tp)

static void rtl8153b_up(struct r8152 *tp)
{
+ u32 ocp_data;
+
if (test_bit(RTL8152_UNPLUG, &tp->flags))
return;

@@ -5015,17 +5018,27 @@ static void rtl8153b_up(struct r8152 *tp)
r8153_first_init(tp);
ocp_write_dword(tp, MCU_TYPE_USB, USB_RX_BUF_TH, RX_THR_B);

+ ocp_data = ocp_read_word(tp, MCU_TYPE_PLA, PLA_MAC_PWR_CTRL3);
+ ocp_data &= ~PLA_MCU_SPDWN_EN;
+ ocp_write_word(tp, MCU_TYPE_PLA, PLA_MAC_PWR_CTRL3, ocp_data);
+
r8153_aldps_en(tp, true);
r8153b_u1u2en(tp, true);
}

static void rtl8153b_down(struct r8152 *tp)
{
+ u32 ocp_data;
+
if (test_bit(RTL8152_UNPLUG, &tp->flags)) {
rtl_drop_queued_tx(tp);
return;
}

+ ocp_data = ocp_read_word(tp, MCU_TYPE_PLA, PLA_MAC_PWR_CTRL3);
+ ocp_data |= PLA_MCU_SPDWN_EN;
+ ocp_write_word(tp, MCU_TYPE_PLA, PLA_MAC_PWR_CTRL3, ocp_data);
+
r8153b_u1u2en(tp, false);
r8153_u2p3en(tp, false);
r8153b_power_cut_en(tp, false);
@@ -5521,6 +5534,10 @@ static void r8153b_init(struct r8152 *tp)
ocp_data |= MAC_CLK_SPDWN_EN;
ocp_write_word(tp, MCU_TYPE_PLA, PLA_MAC_PWR_CTRL2, ocp_data);

+ ocp_data = ocp_read_word(tp, MCU_TYPE_PLA, PLA_MAC_PWR_CTRL3);
+ ocp_data &= ~PLA_MCU_SPDWN_EN;
+ ocp_write_word(tp, MCU_TYPE_PLA, PLA_MAC_PWR_CTRL3, ocp_data);
+
set_bit(GREEN_ETHERNET, &tp->flags);

/* rx aggregation */
--
2.21.0
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