I've added bcm2835_spi_transfer_one_message in spi-bcm2835. This calls spi_split_transfers_maxsize to split large chunks for spi dma transfers. I then removed chunk splitting in the tinydrm spi helper (as now the core is handling the chunk splitting). However, although the SPI HW should be able to accomodate upto 65535 bytes for dma transfers, the splitting of chunks to 65535 bytes results in a dma transfer time out error. However, when the chunks are split to <64 bytes it seems to work fine. Changes in v2: -Patch 2 did not exist in v1. Meghana Madhyastha (2): drm/tinydrm: Remove chunk splitting in tinydrm_spi_transfer spi/spi-bcm2835: Add bcm2835_spi_transfer_one_message in spi-bcm2835.c drivers/gpu/drm/tinydrm/core/tinydrm-helpers.c | 48 ++++---------------------- drivers/gpu/drm/tinydrm/mipi-dbi.c | 10 ++---- drivers/spi/spi-bcm2835.c | 29 ++++++++-------- drivers/spi/spi.c | 5 ++- include/linux/spi/spi.h | 2 ++ 5 files changed, 27 insertions(+), 67 deletions(-) -- 2.11.0 _______________________________________________ dri-devel mailing list dri-devel@xxxxxxxxxxxxxxxxxxxxx https://lists.freedesktop.org/mailman/listinfo/dri-devel
