[PATCH 09/18] media: hantro: default regmap to relaxed MMIO

[Adrian Ratiu]

This is done to match the pre-regmap membarrier behaviour, ensuring
default regmap_write calls in _relaxed() are indeed relaxed while
the non-relaxed versions include an explicit mem-barrier call.

Signed-off-by: Adrian Ratiu <adrian.ratiu@xxxxxxxxxxxxx>
---
 drivers/staging/media/hantro/hantro.h        | 4 ++++
 drivers/staging/media/hantro/hantro_regmap.c | 1 +
 2 files changed, 5 insertions(+)

diff --git a/drivers/staging/media/hantro/hantro.h b/drivers/staging/media/hantro/hantro.h
index c5425cd5ac84..5b7fbdc3779d 100644
--- a/drivers/staging/media/hantro/hantro.h
+++ b/drivers/staging/media/hantro/hantro.h
@@ -346,6 +346,7 @@ static inline void vepu_write_relaxed(struct hantro_dev *vpu,
 static inline void vepu_write(struct hantro_dev *vpu, u32 val, u32 reg)
 {
 	vpu_debug(6, "0x%04x = 0x%08x\n", reg / 4, val);
+	wmb(); /* flush encoder previous relaxed writes */
 	regmap_write(vpu->regs_enc, reg, val);
 }
 
@@ -354,6 +355,7 @@ static inline u32 vepu_read(struct hantro_dev *vpu, u32 reg)
 	u32 val;
 
 	regmap_read(vpu->regs_enc, reg, &val);
+	rmb(); /* read encoder swreg data in order */
 	vpu_debug(6, "0x%04x = 0x%08x\n", reg / 4, val);
 
 	return val;
@@ -369,6 +371,7 @@ static inline void vdpu_write_relaxed(struct hantro_dev *vpu,
 static inline void vdpu_write(struct hantro_dev *vpu, u32 val, u32 reg)
 {
 	vpu_debug(6, "0x%04x = 0x%08x\n", reg / 4, val);
+	wmb();/* flush decoder previous relaxed writes */
 	regmap_write(vpu->regs_dec, reg, val);
 }
 
@@ -377,6 +380,7 @@ static inline u32 vdpu_read(struct hantro_dev *vpu, u32 reg)
 	u32 val;
 
 	regmap_read(vpu->regs_dec, reg, &val);
+	rmb(); /* read decoder swreg data in order */
 	vpu_debug(6, "0x%04x = 0x%08x\n", reg / 4, val);
 
 	return val;
diff --git a/drivers/staging/media/hantro/hantro_regmap.c b/drivers/staging/media/hantro/hantro_regmap.c
index 890e443688e2..2fc409cbd797 100644
--- a/drivers/staging/media/hantro/hantro_regmap.c
+++ b/drivers/staging/media/hantro/hantro_regmap.c
@@ -21,6 +21,7 @@ struct regmap_config hantro_regmap_dec = {
 	.reg_stride = 4,
 	/* all hantro accesses are sequential, even with respect to irq ctx */
 	.disable_locking = true,
+	.use_relaxed_mmio = true,
 	.name = "hantro_regmap_dec",
 };
 
-- 
2.28.0