[PATCH v8 8/9] dmaengine: dw-edma: Add DW_EDMA_CHIP_32BIT_DBI for chip specific flags

[Frank Li <Frank.Li@xxxxxxx>]

DW_EDMA_CHIP_32BIT_DBI was used by the controller drivers like i.MX8 that
allows only 32bit access to the DBI region.

Signed-off-by: Frank Li <Frank.Li@xxxxxxx>
Reviewed-by: Serge Semin <fancer.lancer@xxxxxxxxx>
---

Change from v6 to v8
- none
Change from v5 to v6
- use enum instead of define
New patch at v5
- fix kernel test robot build error

 drivers/dma/dw-edma/dw-edma-v0-core.c | 13 ++++++++-----
 include/linux/dma/edma.h              |  2 ++
 2 files changed, 10 insertions(+), 5 deletions(-)

diff --git a/drivers/dma/dw-edma/dw-edma-v0-core.c b/drivers/dma/dw-edma/dw-edma-v0-core.c
index 2ab1059a3de1e..2d3f74ccc340a 100644
--- a/drivers/dma/dw-edma/dw-edma-v0-core.c
+++ b/drivers/dma/dw-edma/dw-edma-v0-core.c
@@ -417,15 +417,18 @@ void dw_edma_v0_core_start(struct dw_edma_chunk *chunk, bool first)
 		SET_CH_32(dw, chan->dir, chan->id, ch_control1,
 			  (DW_EDMA_V0_CCS | DW_EDMA_V0_LLE));
 		/* Linked list */
-		#ifdef CONFIG_64BIT
-			SET_CH_64(dw, chan->dir, chan->id, llp.reg,
-				  chunk->ll_region.paddr);
-		#else /* CONFIG_64BIT */
+		if ((chan->dw->chip->flags & DW_EDMA_CHIP_32BIT_DBI) ||
+		    !IS_ENABLED(CONFIG_64BIT)) {
 			SET_CH_32(dw, chan->dir, chan->id, llp.lsb,
 				  lower_32_bits(chunk->ll_region.paddr));
 			SET_CH_32(dw, chan->dir, chan->id, llp.msb,
 				  upper_32_bits(chunk->ll_region.paddr));
-		#endif /* CONFIG_64BIT */
+		} else {
+		#ifdef CONFIG_64BIT
+			SET_CH_64(dw, chan->dir, chan->id, llp.reg,
+				  chunk->ll_region.paddr);
+		#endif
+		}
 	}
 	/* Doorbell */
 	SET_RW_32(dw, chan->dir, doorbell,
diff --git a/include/linux/dma/edma.h b/include/linux/dma/edma.h
index fbd05a7284934..8b134896c9edb 100644
--- a/include/linux/dma/edma.h
+++ b/include/linux/dma/edma.h
@@ -36,9 +36,11 @@ enum dw_edma_map_format {
 /**
  * enum dw_edma_chip_flags - Flags specific to an eDMA chip
  * @DW_EDMA_CHIP_LOCAL:		eDMA is used locally by an endpoint
+ * @DW_EDMA_CHIP_32BIT_DBI	Only support 32bit DBI register access
  */
 enum dw_edma_chip_flags {
 	DW_EDMA_CHIP_LOCAL	= BIT(0),
+	DW_EDMA_CHIP_32BIT_DBI	= BIT(1),
 };
 
 /**
-- 
2.35.1