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[2001:b400:e334:c33a:b4cd:4a8f:209a:cf54]) by smtp.gmail.com with ESMTPSA id d2e1a72fcca58-71909003c57sm5813143b3a.89.2024.09.13.03.15.09 (version=TLS1_2 cipher=ECDHE-ECDSA-CHACHA20-POLY1305 bits=256/256); Fri, 13 Sep 2024 03:15:09 -0700 (PDT) From: warp5tw@gmail.com X-Google-Original-From: kfting@nuvoton.com To: avifishman70@gmail.com, tmaimon77@gmail.com, tali.perry1@gmail.com, venture@google.com, yuenn@google.com, benjaminfair@google.com, andi.shyti@kernel.org, andriy.shevchenko@linux.intel.com, wsa@kernel.org, rand.sec96@gmail.com, wsa+renesas@sang-engineering.com, warp5tw@gmail.com, tali.perry@nuvoton.com, Avi.Fishman@nuvoton.com, tomer.maimon@nuvoton.com, KWLIU@nuvoton.com, JJLIU0@nuvoton.com, kfting@nuvoton.com Cc: openbmc@lists.ozlabs.org, linux-i2c@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH v3 4/6] i2c: npcm: Modify the client address assignment Date: Fri, 13 Sep 2024 18:14:44 +0800 Message-Id: <20240913101445.16513-5-kfting@nuvoton.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20240913101445.16513-1-kfting@nuvoton.com> References: <20240913101445.16513-1-kfting@nuvoton.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" From: Tyrone Ting Store the client address earlier since it might get called in the i2c_recover_bus logic flow at the early stage of the function npcm_i2c_master_xfer. Signed-off-by: Tyrone Ting Reviewed-by: Tali Perry --- drivers/i2c/busses/i2c-npcm7xx.c | 13 ++++++++++++- 1 file changed, 12 insertions(+), 1 deletion(-) diff --git a/drivers/i2c/busses/i2c-npcm7xx.c b/drivers/i2c/busses/i2c-npcm= 7xx.c index 68f3d47323ab..e52e65e63600 100644 --- a/drivers/i2c/busses/i2c-npcm7xx.c +++ b/drivers/i2c/busses/i2c-npcm7xx.c @@ -2155,6 +2155,18 @@ static int npcm_i2c_master_xfer(struct i2c_adapter *= adap, struct i2c_msg *msgs, =20 } while (time_is_after_jiffies(time_left) && bus_busy); =20 + /* + * Previously, the address was stored w/o left-shift by one bit and + * with that shift in the following call to npcm_i2c_master_start_xmit. + * + * Since there are cases that the i2c_recover_bus gets called at the + * early stage of the function npcm_i2c_master_xfer, the address is + * stored with the shift and used in the i2c_recover_bus call. + * + * The address is stored from bit 1 to bit 7 in the register for + * sending the i2c address later so it's left-shifted by 1 bit. + */ + bus->dest_addr =3D slave_addr << 1; if (bus_busy || bus->ber_state) { iowrite8(NPCM_I2CCST_BB, bus->reg + NPCM_I2CCST); npcm_i2c_reset(bus); @@ -2163,7 +2175,6 @@ static int npcm_i2c_master_xfer(struct i2c_adapter *a= dap, struct i2c_msg *msgs, } =20 npcm_i2c_init_params(bus); - bus->dest_addr =3D slave_addr; bus->msgs =3D msgs; bus->msgs_num =3D num; bus->cmd_err =3D 0; --=20 2.34.1