Commit aa874cdf authored Mar 20, 2023 by Tharun Kumar P Committed by Wolfram Sang Mar 29, 2023

i2c: mchp-pci1xxxx: Update Timing registers

Update I2C timing registers based on latest hardware design.
This fix does not break functionality of chips with older design and
existing users will not be affected.

Fixes: 36169369 ("i2c: microchip: pci1xxxx: Add driver for I2C host controller in multifunction endpoint of pci1xxxx switch")
Signed-off-by: Tharun Kumar P <tharunkumar.pasumarthi@microchip.com>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Wolfram Sang <wsa@kernel.org>

parent 197b6b60

drivers/i2c/busses/i2c-mchp-pci1xxxx.c

+30 −30

Original line number	Diff line number	Diff line
		@@ -48,9 +48,9 @@
		* SR_HOLD_TIME_XK_TICKS field will indicate the number of ticks of the
		* baud clock required to program 'Hold Time' at X KHz.
		*/
		#define SR_HOLD_TIME_100K_TICKS 133
		#define SR_HOLD_TIME_100K_TICKS 150
		#define SR_HOLD_TIME_400K_TICKS 20
		#define SR_HOLD_TIME_1000K_TICKS 11
		#define SR_HOLD_TIME_1000K_TICKS 12

		#define SMB_CORE_COMPLETION_REG_OFF3 (SMBUS_MAST_CORE_ADDR_BASE + 0x23)

		@@ -65,17 +65,17 @@
		* the baud clock required to program 'fair idle delay' at X KHz. Fair idle
		* delay establishes the MCTP T(IDLE_DELAY) period.
		*/
		#define FAIR_BUS_IDLE_MIN_100K_TICKS 969
		#define FAIR_BUS_IDLE_MIN_400K_TICKS 157
		#define FAIR_BUS_IDLE_MIN_1000K_TICKS 157
		#define FAIR_BUS_IDLE_MIN_100K_TICKS 992
		#define FAIR_BUS_IDLE_MIN_400K_TICKS 500
		#define FAIR_BUS_IDLE_MIN_1000K_TICKS 500

		/*
		* FAIR_IDLE_DELAY_XK_TICKS field will indicate the number of ticks of the
		* baud clock required to satisfy the fairness protocol at X KHz.
		*/
		#define FAIR_IDLE_DELAY_100K_TICKS 1000
		#define FAIR_IDLE_DELAY_400K_TICKS 500
		#define FAIR_IDLE_DELAY_1000K_TICKS 500
		#define FAIR_IDLE_DELAY_100K_TICKS 963
		#define FAIR_IDLE_DELAY_400K_TICKS 156
		#define FAIR_IDLE_DELAY_1000K_TICKS 156

		#define SMB_IDLE_SCALING_100K \
		((FAIR_IDLE_DELAY_100K_TICKS << 16) \| FAIR_BUS_IDLE_MIN_100K_TICKS)
		@@ -142,16 +142,16 @@
		* determines the SCLK hold time following SDAT driven low during the first
		* START bit in a transfer.
		*/
		#define FIRST_START_HOLD_100K_TICKS 22
		#define FIRST_START_HOLD_400K_TICKS 16
		#define FIRST_START_HOLD_1000K_TICKS 6
		#define FIRST_START_HOLD_100K_TICKS 23
		#define FIRST_START_HOLD_400K_TICKS 8
		#define FIRST_START_HOLD_1000K_TICKS 12

		/*
		* STOP_SETUP_XK_TICKS will indicate the number of ticks of the baud clock
		* required to program 'STOP_SETUP' timer at X KHz. This timer determines the
		* SDAT setup time from the rising edge of SCLK for a STOP condition.
		*/
		#define STOP_SETUP_100K_TICKS 157
		#define STOP_SETUP_100K_TICKS 150
		#define STOP_SETUP_400K_TICKS 20
		#define STOP_SETUP_1000K_TICKS 12

		@@ -160,7 +160,7 @@
		* required to program 'RESTART_SETUP' timer at X KHz. This timer determines the
		* SDAT setup time from the rising edge of SCLK for a repeated START condition.
		*/
		#define RESTART_SETUP_100K_TICKS 157
		#define RESTART_SETUP_100K_TICKS 156
		#define RESTART_SETUP_400K_TICKS 20
		#define RESTART_SETUP_1000K_TICKS 12

		@@ -169,7 +169,7 @@
		* required to program 'DATA_HOLD' timer at X KHz. This timer determines the
		* SDAT hold time following SCLK driven low.
		*/
		#define DATA_HOLD_100K_TICKS 2
		#define DATA_HOLD_100K_TICKS 12
		#define DATA_HOLD_400K_TICKS 2
		#define DATA_HOLD_1000K_TICKS 2

		@@ -190,35 +190,35 @@
		* Bus Idle Minimum time = BUS_IDLE_MIN[7:0] x Baud_Clock_Period x
		* (BUS_IDLE_MIN_XK_TICKS[7] ? 4,1)
		*/
		#define BUS_IDLE_MIN_100K_TICKS 167UL
		#define BUS_IDLE_MIN_400K_TICKS 139UL
		#define BUS_IDLE_MIN_1000K_TICKS 133UL
		#define BUS_IDLE_MIN_100K_TICKS 36UL
		#define BUS_IDLE_MIN_400K_TICKS 10UL
		#define BUS_IDLE_MIN_1000K_TICKS 4UL

		/*
		* CTRL_CUM_TIME_OUT_XK_TICKS defines SMBus Controller Cumulative Time-Out.
		* SMBus Controller Cumulative Time-Out duration =
		* CTRL_CUM_TIME_OUT_XK_TICKS[7:0] x Baud_Clock_Period x 2048
		*/
		#define CTRL_CUM_TIME_OUT_100K_TICKS 159
		#define CTRL_CUM_TIME_OUT_400K_TICKS 159
		#define CTRL_CUM_TIME_OUT_1000K_TICKS 159
		#define CTRL_CUM_TIME_OUT_100K_TICKS 76
		#define CTRL_CUM_TIME_OUT_400K_TICKS 76
		#define CTRL_CUM_TIME_OUT_1000K_TICKS 76

		/*
		* TARGET_CUM_TIME_OUT_XK_TICKS defines SMBus Target Cumulative Time-Out duration.
		* SMBus Target Cumulative Time-Out duration = TARGET_CUM_TIME_OUT_XK_TICKS[7:0] x
		* Baud_Clock_Period x 4096
		*/
		#define TARGET_CUM_TIME_OUT_100K_TICKS 199
		#define TARGET_CUM_TIME_OUT_400K_TICKS 199
		#define TARGET_CUM_TIME_OUT_1000K_TICKS 199
		#define TARGET_CUM_TIME_OUT_100K_TICKS 95
		#define TARGET_CUM_TIME_OUT_400K_TICKS 95
		#define TARGET_CUM_TIME_OUT_1000K_TICKS 95

		/*
		* CLOCK_HIGH_TIME_OUT_XK defines Clock High time out period.
		* Clock High time out period = CLOCK_HIGH_TIME_OUT_XK[7:0] x Baud_Clock_Period x 8
		*/
		#define CLOCK_HIGH_TIME_OUT_100K_TICKS 204
		#define CLOCK_HIGH_TIME_OUT_400K_TICKS 204
		#define CLOCK_HIGH_TIME_OUT_1000K_TICKS 204
		#define CLOCK_HIGH_TIME_OUT_100K_TICKS 97
		#define CLOCK_HIGH_TIME_OUT_400K_TICKS 97
		#define CLOCK_HIGH_TIME_OUT_1000K_TICKS 97

		#define TO_SCALING_100K \
		((BUS_IDLE_MIN_100K_TICKS << 24) \| (CTRL_CUM_TIME_OUT_100K_TICKS << 16) \| \