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Message-Id: <20220128162650.2510062-1-tobias@waldekranz.com> Date: Fri, 28 Jan 2022 17:26:48 +0100 From: Tobias Waldekranz <tobias@...dekranz.com> To: davem@...emloft.net, kuba@...nel.org Cc: netdev@...r.kernel.org, andrew@...n.ch, David.Laight@...LAB.COM Subject: [PATCH v3 net-next 0/2] net: dsa: mv88e6xxx: Improve indirect addressing performance The individual patches have all the details. This work was triggered by recent work on a platform that took 16s (sic) to load the mv88e6xxx module. The first patch gets rid of most of that time by replacing a very long delay with a tighter poll loop to wait for the busy bit to clear. The second patch shaves off some more time by avoiding redundant busy-bit-checks, saving 1 out of 4 MDIO operations for every register read/write in the optimal case. v1 -> v2: - Make sure that we always poll the busy bit at least twice, in the unlikely event that the first one is quick to query the hardware, but is then scheduled out for a long time before the timeout is checked. v2 -> v3: - Fallback to the longer sleeps after the initial two poll attempts. Tobias Waldekranz (2): net: dsa: mv88e6xxx: Improve performance of busy bit polling net: dsa: mv88e6xxx: Improve indirect addressing performance drivers/net/dsa/mv88e6xxx/chip.c | 13 +++++++++--- drivers/net/dsa/mv88e6xxx/chip.h | 1 + drivers/net/dsa/mv88e6xxx/smi.c | 35 +++++++++++++++++++++----------- 3 files changed, 34 insertions(+), 15 deletions(-) -- 2.25.1
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