From 08bc26f28bcbef4b96c94205a4cee5a763514279 Mon Sep 17 00:00:00 2001 From: Terry Bowman Date: Wed, 9 Feb 2022 11:27:13 -0600 Subject: [PATCH] i2c: piix4: Move SMBus port selection into function commit fbafbd51bff52cb3a920fd98d4dae2a78dd433d0 upstream. Move port selection code into a separate function. Refactor is in preparation for following MMIO changes. Signed-off-by: Terry Bowman Reviewed-by: Andy Shevchenko Reviewed-by: Jean Delvare Signed-off-by: Wolfram Sang Cc: Mario Limonciello Signed-off-by: Greg Kroah-Hartman --- drivers/i2c/busses/i2c-piix4.c | 27 +++++++++++++++++---------- 1 file changed, 17 insertions(+), 10 deletions(-) diff --git a/drivers/i2c/busses/i2c-piix4.c b/drivers/i2c/busses/i2c-piix4.c index 132ded7..efe51f6 100644 --- a/drivers/i2c/busses/i2c-piix4.c +++ b/drivers/i2c/busses/i2c-piix4.c @@ -698,6 +698,20 @@ static void piix4_imc_wakeup(void) release_region(KERNCZ_IMC_IDX, 2); } +static int piix4_sb800_port_sel(u8 port) +{ + u8 smba_en_lo, val; + + outb_p(piix4_port_sel_sb800, SB800_PIIX4_SMB_IDX); + smba_en_lo = inb_p(SB800_PIIX4_SMB_IDX + 1); + + val = (smba_en_lo & ~piix4_port_mask_sb800) | port; + if (smba_en_lo != val) + outb_p(val, SB800_PIIX4_SMB_IDX + 1); + + return (smba_en_lo & piix4_port_mask_sb800); +} + /* * Handles access to multiple SMBus ports on the SB800. * The port is selected by bits 2:1 of the smb_en register (0x2c). @@ -714,8 +728,7 @@ static s32 piix4_access_sb800(struct i2c_adapter *adap, u16 addr, unsigned short piix4_smba = adapdata->smba; int retries = MAX_TIMEOUT; int smbslvcnt; - u8 smba_en_lo; - u8 port; + u8 prev_port; int retval; retval = piix4_sb800_region_request(&adap->dev); @@ -775,18 +788,12 @@ static s32 piix4_access_sb800(struct i2c_adapter *adap, u16 addr, } } - outb_p(piix4_port_sel_sb800, SB800_PIIX4_SMB_IDX); - smba_en_lo = inb_p(SB800_PIIX4_SMB_IDX + 1); - - port = adapdata->port; - if ((smba_en_lo & piix4_port_mask_sb800) != port) - outb_p((smba_en_lo & ~piix4_port_mask_sb800) | port, - SB800_PIIX4_SMB_IDX + 1); + prev_port = piix4_sb800_port_sel(adapdata->port); retval = piix4_access(adap, addr, flags, read_write, command, size, data); - outb_p(smba_en_lo, SB800_PIIX4_SMB_IDX + 1); + piix4_sb800_port_sel(prev_port); /* Release the semaphore */ outb_p(smbslvcnt | 0x20, SMBSLVCNT); -- 2.7.4