[PATCH v9 00/10] hw/ssi: imx_spi: Fix various bugs in the imx_spi model

[Bin Meng <bmeng.cn@gmail.com>]

From: Bin Meng <bin.meng@windriver.com>

Starting from v8, the series is based on the following 2 versions:

- v5 series sent from Bin
  http://patchwork.ozlabs.org/project/qemu-devel/list/?series=223919
- v7 series sent from Philippe
  http://patchwork.ozlabs.org/project/qemu-devel/list/?series=224612

This series fixes a bunch of bugs in current implementation of the imx
spi controller, including the following issues:

- remove imx_spi_update_irq() in imx_spi_reset()
- chip select signal was not lower down when spi controller is disabled
- round up the tx burst length to be multiple of 8
- transfer incorrect data when the burst length is larger than 32 bit
- spi controller tx and rx fifo endianness is incorrect
- remove pointless variable (s->burst_length) initialization (Philippe)
- rework imx_spi_reset() to keep CONREG register value (Philippe)
- rework imx_spi_read() to handle block disabled (Philippe)
- rework imx_spi_write() to handle block disabled (Philippe)

Tested with upstream U-Boot v2020.10 (polling mode) and VxWorks 7
(interrupt mode).

Changes in v9:
- Add a 'common_reset' function that does most of reset operation,
  leaving ECSPI_CONREG clear in imx_spi_reset().
- Do the LOG_UNIMP when the unsupported burst length value is written,
  rather than where it is used.
- Squash the 2 LOG_UNIMP warnings down into one line

Changes in v8:
- keep the controller disable logic in the ECSPI_CONREG case
  in imx_spi_write()

Changes in v7:
- remove the RFC tag
- remove the RFC tag
- remove the RFC tag
- remove the RFC tag

Changes in v6:
- new patch: [RFC] remove pointless variable initialization
- new patch: [RFC] rework imx_spi_reset() to keep CONREG register value
- new patch: [RFC] rework imx_spi_read() to handle block disabled
- new patch: [RFC] rework imx_spi_write() to handle block disabled

Changes in v5:
- rename imx_spi_hard_reset() to imx_spi_soft_reset()
- round up the burst length to be multiple of 8

Changes in v4:
- adujst the patch 2,3 order
- rename imx_spi_soft_reset() to imx_spi_hard_reset() to avoid confusion
- s/normal/common/ in the commit message
- log the burst length value in the log message

Changes in v3:
- new patch: remove imx_spi_update_irq() in imx_spi_reset()
- Move the chip selects disable out of imx_spi_reset()
- new patch: log unimplemented burst length
- Simplify the tx fifo endianness handling

Changes in v2:
- Fix the "Fixes" tag in the commit message
- Use ternary operator as Philippe suggested

Bin Meng (5):
  hw/ssi: imx_spi: Use a macro for number of chip selects supported
  hw/ssi: imx_spi: Remove imx_spi_update_irq() in imx_spi_reset()
  hw/ssi: imx_spi: Round up the burst length to be multiple of 8
  hw/ssi: imx_spi: Correct the burst length > 32 bit transfer logic
  hw/ssi: imx_spi: Correct tx and rx fifo endianness

Philippe Mathieu-Daudé (4):
  hw/ssi: imx_spi: Remove pointless variable initialization
  hw/ssi: imx_spi: Rework imx_spi_reset() to keep CONREG register value
  hw/ssi: imx_spi: Rework imx_spi_read() to handle block disabled
  hw/ssi: imx_spi: Rework imx_spi_write() to handle block disabled

Xuzhou Cheng (1):
  hw/ssi: imx_spi: Disable chip selects when controller is disabled

 include/hw/ssi/imx_spi.h |   5 +-
 hw/ssi/imx_spi.c         | 153 +++++++++++++++++++++++++--------------
 2 files changed, 101 insertions(+), 57 deletions(-)

-- 
2.25.1