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71 lines
2.0 KiB
Diff
71 lines
2.0 KiB
Diff
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From 57df0fb9d511f91202114813e90128d65c0589f0 Mon Sep 17 00:00:00 2001
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From: Hayes Wang <hayeswang@realtek.com>
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Date: Wed, 26 Jul 2023 11:08:07 +0800
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Subject: [PATCH] r8152: adjust generic_ocp_write function
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Reduce the control transfer if all bytes of first or the last DWORD are
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written.
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The original method is to split the control transfer into three parts
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(the first DWORD, middle continuous data, and the last DWORD). However,
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they could be combined if whole bytes of the first DWORD or last DWORD
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are written. That is, the first DWORD or the last DWORD could be combined
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with the middle continuous data, if the byte_en is 0xff.
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Signed-off-by: Hayes Wang <hayeswang@realtek.com>
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Link: https://lore.kernel.org/r/20230726030808.9093-418-nic_swsd@realtek.com
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Signed-off-by: Jakub Kicinski <kuba@kernel.org>
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---
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drivers/net/usb/r8152.c | 29 ++++++++++++++++++-----------
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1 file changed, 18 insertions(+), 11 deletions(-)
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--- a/drivers/net/usb/r8152.c
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+++ b/drivers/net/usb/r8152.c
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@@ -1310,16 +1310,24 @@ static int generic_ocp_write(struct r815
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byteen_end = byteen & BYTE_EN_END_MASK;
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byen = byteen_start | (byteen_start << 4);
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- ret = set_registers(tp, index, type | byen, 4, data);
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- if (ret < 0)
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- goto error1;
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-
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- index += 4;
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- data += 4;
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- size -= 4;
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- if (size) {
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+ /* Split the first DWORD if the byte_en is not 0xff */
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+ if (byen != BYTE_EN_DWORD) {
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+ ret = set_registers(tp, index, type | byen, 4, data);
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+ if (ret < 0)
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+ goto error1;
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+
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+ index += 4;
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+ data += 4;
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size -= 4;
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+ }
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+
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+ if (size) {
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+ byen = byteen_end | (byteen_end >> 4);
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+
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+ /* Split the last DWORD if the byte_en is not 0xff */
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+ if (byen != BYTE_EN_DWORD)
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+ size -= 4;
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while (size) {
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if (size > limit) {
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@@ -1346,10 +1354,9 @@ static int generic_ocp_write(struct r815
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}
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}
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- byen = byteen_end | (byteen_end >> 4);
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- ret = set_registers(tp, index, type | byen, 4, data);
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- if (ret < 0)
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- goto error1;
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+ /* Set the last DWORD */
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+ if (byen != BYTE_EN_DWORD)
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+ ret = set_registers(tp, index, type | byen, 4, data);
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}
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error1:
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