[PATCH 3/4] dmaengine: ti: cppi41: Restore QMGR_MEMCTRL in resume

["Markus Schneider-Pargmann (TI)" <msp@baylibre.com>]

Currently only QMGR_MEMBASE is restored in resume, QMGR_MEMCTRL is left
at its default values.

Add a restore for QMGR_MEMCTRL. This introduces a helper function
cppi41_memctrl() to not duplicate this calcuation in init and resume.

Fixes: f97b98d6d02e ("dma: cppi41: add support for suspend and resume")
Cc: stable@vger.kernel.org
Signed-off-by: Markus Schneider-Pargmann (TI) <msp@baylibre.com>
---
 drivers/dma/ti/cppi41.c | 27 +++++++++++++++------------
 1 file changed, 15 insertions(+), 12 deletions(-)

diff --git a/drivers/dma/ti/cppi41.c b/drivers/dma/ti/cppi41.c
index f5a824418fe7..e2a089066c6d 100644
--- a/drivers/dma/ti/cppi41.c
+++ b/drivers/dma/ti/cppi41.c
@@ -842,13 +842,22 @@ static void deinit_cppi41(struct device *dev, struct cppi41_dd *cdd)
 			cdd->scratch_phys);
 }
 
+static u32 cppi41_memctrl(int area)
+{
+	u32 reg;
+
+	reg = (area * ALLOC_DECS_NUM) << QMGR_MEMCTRL_IDX_SH;
+	reg |= (ilog2(sizeof(struct cppi41_desc)) - 5) << QMGR_MEMCTRL_DESC_SH;
+	reg |= ilog2(ALLOC_DECS_NUM) - 5;
+
+	return reg;
+}
+
 static int init_descs(struct device *dev, struct cppi41_dd *cdd)
 {
 	unsigned int desc_size;
 	unsigned int mem_decs;
 	int i;
-	u32 reg;
-	u32 idx;
 
 	BUILD_BUG_ON(sizeof(struct cppi41_desc) &
 			(sizeof(struct cppi41_desc) - 1));
@@ -858,13 +867,7 @@ static int init_descs(struct device *dev, struct cppi41_dd *cdd)
 	desc_size = sizeof(struct cppi41_desc);
 	mem_decs = ALLOC_DECS_NUM * desc_size;
 
-	idx = 0;
 	for (i = 0; i < DESCS_AREAS; i++) {
-
-		reg = idx << QMGR_MEMCTRL_IDX_SH;
-		reg |= (ilog2(desc_size) - 5) << QMGR_MEMCTRL_DESC_SH;
-		reg |= ilog2(ALLOC_DECS_NUM) - 5;
-
 		BUILD_BUG_ON(DESCS_AREAS != 1);
 		cdd->cd = dma_alloc_coherent(dev, mem_decs,
 				&cdd->descs_phys, GFP_KERNEL);
@@ -872,9 +875,7 @@ static int init_descs(struct device *dev, struct cppi41_dd *cdd)
 			return -ENOMEM;
 
 		cppi_writel(cdd->descs_phys, cdd->qmgr_mem + QMGR_MEMBASE(i));
-		cppi_writel(reg, cdd->qmgr_mem + QMGR_MEMCTRL(i));
-
-		idx += ALLOC_DECS_NUM;
+		cppi_writel(cppi41_memctrl(i), cdd->qmgr_mem + QMGR_MEMCTRL(i));
 	}
 	return 0;
 }
@@ -1191,8 +1192,10 @@ static int __maybe_unused cppi41_resume(struct device *dev)
 	if (pm_runtime_status_suspended(dev))
 		return 0;
 
-	for (i = 0; i < DESCS_AREAS; i++)
+	for (i = 0; i < DESCS_AREAS; i++) {
 		cppi_writel(cdd->descs_phys, cdd->qmgr_mem + QMGR_MEMBASE(i));
+		cppi_writel(cppi41_memctrl(i), cdd->qmgr_mem + QMGR_MEMCTRL(i));
+	}
 
 	list_for_each_entry(c, &cdd->ddev.channels, chan.device_node)
 		if (!c->is_tx)

-- 
2.55.0