[PATCH v4 0/3] dwc3: gadget: properly fix cache operations

[Neil Armstrong]

We experience huge problems with cache handling on Qualcomm
systems, and it appears the dcache handling in the DWC3 gadget
code is quite wrong and causes operational issues.

This serie fixes the dcache operations on unaligned data,
and properly invalidate buffers when reading back data from
hardware.

Signed-off-by: Neil Armstrong <neil.armstrong at linaro.org>
---
Changes in v4:
- Go back to CACHELINE_SIZE, and do not use DMA_MINALIGN since it's not valid for all platforms
- Link to v3: https://lore.kernel.org/r/20241002-u-boot-dwc3-gadget-dcache-fixup-v3-0-5398088ef93c@linaro.org

Changes in v3:
- Cast addresses to (unsigned long) when calling invalidate_dcache_range()
- Drop unused CACHELINE_SIZE
- Fix warning by casting ctrl to uintptr_r when calling dwc3_invalidate_cache()
- Link to v2: https://lore.kernel.org/r/20240724-u-boot-dwc3-gadget-dcache-fixup-v2-0-65836d699a71@linaro.org

Changes in v2:
- Fix typo in drivers/usb/dwc3/core.h and rewrite patch 1 commit message
- Link to v1: https://lore.kernel.org/r/20240719-u-boot-dwc3-gadget-dcache-fixup-v1-0-58a5f026ea8e@linaro.org

---
Neil Armstrong (3):
      usb: dwc3: allocate setup_buf with dma_alloc_coherent()
      usb: dwc3: fix dcache flush range calculation
      usb: dwc3: invalidate dcache on buffer used in interrupt handling

 drivers/usb/dwc3/core.h   |  2 ++
 drivers/usb/dwc3/ep0.c    |  6 ++++--
 drivers/usb/dwc3/gadget.c | 10 ++++++----
 drivers/usb/dwc3/io.h     | 13 ++++++++++++-
 4 files changed, 24 insertions(+), 7 deletions(-)
---
base-commit: ddbcafeb53e7093c58488596bfce6d8823777c3a
change-id: 20240719-u-boot-dwc3-gadget-dcache-fixup-ea1e92758663

Best regards,
-- 
Neil Armstrong <neil.armstrong at linaro.org>