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Learn why this is important at https://aka.ms/LearnAboutSenderIdentification ] > > From: Nuno Sá > > The src_addr_widths and dst_addr_widths capability masks encode each > supported width as a bit whose position equals the corresponding > enum dma_slave_buswidth value (e.g. DMA_SLAVE_BUSWIDTH_4_BYTES sets > bit 4). As these masks are plain u32, widths of 32 bytes and above > (DMA_SLAVE_BUSWIDTH_32/64/128_BYTES map to bits 32, 64 and 128) cannot > be represented at all. This is problem, which should be fixed. > > Introduce bitmap-based masks that span the full enum range. To allow > controllers and consumers to be converted incrementally, the legacy > u32 fields are kept alongside the new bitmaps: producers populate the > bitmap (mirroring the low 32 bits back into the legacy field) and > dma_get_slave_caps() folds a legacy-only producer's u32 into the > returned bitmap. > > Add dma_set_{src,dst}_addr_mask() for producers and > dma_slave_caps_get_{src,dst}_width_min() for consumers so that, once > every user is converted, the legacy u32 fields can be dropped and the > bitmaps renamed without further churn. Good mirgration plan. Frank