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Introduction
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- Repeated start after a read transfer is not supported by this controller. A warning is given when this condition is detected by the driver.
- The following are the controller errata:
- Missing glitch filter.
- I2C Master Generates Invalid Read Transactions
- Missing I2C Master Completion Interrupt.
- Timing requirement violations
- I2C - Standard Mode running faster than 90 kHz violates tHD; STA timing requirement.
- I2C - Fast Mode running faster than 384kHz violates tLOW; STA timing requirement.
- I2C - Fast Mode running faster than 384 kHz violates tBUF; STA timing requirement.
- I2C Missing Arbitration On Repeated Start.
Multi-master configuration works only if all the participating masters are operating at the same frequency.
Important AR links
- Zynq-7000 AP SoC, I2C - Missing Glitch Filter Implementation in Zynq PS I2C Controller AR# 61861
- Zynq-7000 AP SoC, I2C - I2C Master Generates Invalid Read Transactions AR# 61664
- Zynq-7000 AP SoC, I2C - Missing I2C Master Completion Interrupt AR# 61665
- Zynq-7000 AP SoC, I2C - I2C Missing Arbitration on Repeated Start AR# 60695
- Zynq-7000 AP SoC, I2C - Standard Mode running faster than 90 kHz violates tHD; STA timing requirement AR# 59366
- Zynq-7000 AP SoC, I2C - Fast Mode running faster than 384kHz violates tLOW; STA timing requirement AR# 60693
- Zynq-7000 AP SoC, I2C - Fast Mode running faster than 384 kHz violates tBUF; STA timing requirement AR# 60694
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ChangeLog
2023.2
- None
2023.1
Summary
- Support PEC for SMBus block read
- Add standard bus recovery support
- Fix regression with bus recovery
Commits
9fdf6d9 - i2c: cadence: Support PEC for SMBus block read
58b9242 - i2c: cadence: Add standard bus recovery support
8bfd4ec - i2c: cadence: Fix regression with bus recovery
2022.2
Summary
- Change large transfer count reset logic to be unconditional
Commits
42ab616 - i2c: cadence: Change large transfer count reset logic to be unconditional
2022.1
Summary
- Add IRQ check
- Fix reference leak when pm_runtime_get_sync fails
Commits
ed35515 - i2c: cadence: add IRQ check
b14b31f - i2c: cadence: fix reference leak when pm_runtime_get_sync fails
Related Links
None