[PATCH] dmaengine: mmp_pdma: fix wrong extended DRCMR base for SpacemiT K3

[Troy Mitchell]

K3 PDMA shares the same DRCMR layout as K1, where the extended DRCMR
base address is 0x1100. Commit 6587b8661a0b ("dmaengine: mmp_pdma: add
SpacemiT K3 support") incorrectly defined DRCMR_EXT_BASE_K3 as 0x1000,
causing all DRCMR accesses for channels >= 64 to be off by 0x100.

Drop the bogus DRCMR_EXT_BASE_K3 macro and reuse DRCMR_EXT_BASE_DEFAULT
for the K3 ops.

Fixes: 6587b8661a0b ("dmaengine: mmp_pdma: add SpacemiT K3 support")
Signed-off-by: Troy Mitchell <troy.mitchell@xxxxxxxxxxxxxxxxxx>
---
This is a minimal fix for the wrong DRCMR_EXT_BASE_K3 value introduced
by commit 6587b8661a0b ("dmaengine: mmp_pdma: add SpacemiT K3 support").
K3 PDMA shares the same extended DRCMR base (0x1100) as K1, so the K3
ops now reuses DRCMR_EXT_BASE_DEFAULT.

I deliberately kept the per-ops drcmr_ext_base field and the
DRCMR_EXT_BASE_DEFAULT macro to preserve the extensibility that was
introduced together with the helper refactor, in case a future PDMA
variant ends up using a different extended base. If reviewers prefer
to drop this abstraction entirely and collapse it back to a single
constant now that all known users share the same value, I am happy to
send a v2 that removes the drcmr_ext_base ops field as a cleanup.
---
 drivers/dma/mmp_pdma.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/drivers/dma/mmp_pdma.c b/drivers/dma/mmp_pdma.c
index 386e85cd4882..78e3e07e681d 100644
--- a/drivers/dma/mmp_pdma.c
+++ b/drivers/dma/mmp_pdma.c
@@ -52,7 +52,6 @@
 #define DCSR_EORINTR	BIT(9)	/* The end of Receive */
 
 #define DRCMR_BASE		0x0100
-#define DRCMR_EXT_BASE_K3	0x1000
 #define DRCMR_EXT_BASE_DEFAULT	0x1100
 #define DRCMR_REQ_LIMIT		64
 #define DRCMR_MAPVLD	BIT(7)	/* Map Valid (read / write) */
@@ -1219,7 +1218,7 @@ static const struct mmp_pdma_ops spacemit_k3_pdma_ops = {
 	.get_desc_dst_addr = get_desc_dst_addr_64,
 	.run_bits = (DCSR_RUN | DCSR_LPAEEN | DCSR_EORIRQEN | DCSR_EORSTOPEN),
 	.dma_width = 64,
-	.drcmr_ext_base = DRCMR_EXT_BASE_K3,
+	.drcmr_ext_base = DRCMR_EXT_BASE_DEFAULT,
 };
 
 static const struct of_device_id mmp_pdma_dt_ids[] = {

---
base-commit: c425609d6ac4012c8bbf01ec2e10e801b1923a7b
change-id: 20260615-k3-pdma-fix-drcmr-base-326536770427

Best regards,
--  
Troy Mitchell <troy.mitchell@xxxxxxxxxxxxxxxxxx>