[PATCH v2 0/2] regmap: provide simple bitops and use them in a driver

[PATCH v2 0/2] regmap: provide simple bitops and use them in a driver

[Bartosz Golaszewski]

From: Bartosz Golaszewski <bgolaszewski@baylibre.com>

I noticed that oftentimes I use regmap_update_bits() for simple bit
setting or clearing. In this case the fourth argument is superfluous as
it's always 0 or equal to the mask argument.

This series proposes to add simple bit operations for setting, clearing
and testing specific bits with regmap.

The second patch uses all three in a driver that got recently picked into
the net-next tree.

The patches obviously target different trees so - if you're ok with
the change itself - I propose you pick the first one into your regmap
tree for v5.8 and then I'll resend the second patch to add the first
user for these macros for v5.9.

v1 -> v2:
- convert the new macros to static inline functions

Bartosz Golaszewski (2):
  regmap: provide helpers for simple bit operations
  net: ethernet: mtk-star-emac: use regmap bitops

 drivers/base/regmap/regmap.c                  | 22 +++++
 drivers/net/ethernet/mediatek/mtk_star_emac.c | 80 ++++++++-----------
 include/linux/regmap.h                        | 36 +++++++++
 3 files changed, 93 insertions(+), 45 deletions(-)

-- 
2.26.1


_______________________________________________
Linux-mediatek mailing list
Linux-mediatek@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-mediatek

[PATCH v2 1/2] regmap: provide helpers for simple bit operations

[Bartosz Golaszewski]

From: Bartosz Golaszewski <bgolaszewski@baylibre.com>

In many instances regmap_update_bits() is used for simple bit setting
and clearing. In these cases the last argument is redundant and we can
hide it with a static inline function.

This adds three new helpers for simple bit operations: set_bits,
clear_bits and test_bits.

Signed-off-by: Bartosz Golaszewski <bgolaszewski@baylibre.com>
---
 drivers/base/regmap/regmap.c | 22 ++++++++++++++++++++++
 include/linux/regmap.h       | 36 ++++++++++++++++++++++++++++++++++++
 2 files changed, 58 insertions(+)

diff --git a/drivers/base/regmap/regmap.c b/drivers/base/regmap/regmap.c
index 59f911e57719..30f659e0b4e4 100644
--- a/drivers/base/regmap/regmap.c
+++ b/drivers/base/regmap/regmap.c
@@ -2936,6 +2936,28 @@ int regmap_update_bits_base(struct regmap *map, unsigned int reg,
 }
 EXPORT_SYMBOL_GPL(regmap_update_bits_base);
 
+/**
+ * regmap_test_bits() - Check if all specified bits are set in a register.
+ *
+ * @map: Register map to operate on
+ * @reg: Register to read from
+ * @bits: Bits to test
+ *
+ * Returns -1 if the underlying regmap_read() fails, 0 if at least one of the
+ * tested bits is not set and 1 if all tested bits are set.
+ */
+int regmap_test_bits(struct regmap *map, unsigned int reg, unsigned int bits)
+{
+	unsigned int val, ret;
+
+	ret = regmap_read(map, reg, &val);
+	if (ret)
+		return ret;
+
+	return (val & bits) == bits ? 1 : 0;
+}
+EXPORT_SYMBOL_GPL(regmap_test_bits);
+
 void regmap_async_complete_cb(struct regmap_async *async, int ret)
 {
 	struct regmap *map = async->map;
diff --git a/include/linux/regmap.h b/include/linux/regmap.h
index 40b07168fd8e..ddf0baff195d 100644
--- a/include/linux/regmap.h
+++ b/include/linux/regmap.h
@@ -1111,6 +1111,21 @@ bool regmap_reg_in_ranges(unsigned int reg,
 			  const struct regmap_range *ranges,
 			  unsigned int nranges);
 
+static inline int regmap_set_bits(struct regmap *map,
+				  unsigned int reg, unsigned int bits)
+{
+	return regmap_update_bits_base(map, reg, bits, bits,
+				       NULL, false, false);
+}
+
+static inline int regmap_clear_bits(struct regmap *map,
+				    unsigned int reg, unsigned int bits)
+{
+	return regmap_update_bits_base(map, reg, bits, 0, NULL, false, false);
+}
+
+int regmap_test_bits(struct regmap *map, unsigned int reg, unsigned int bits);
+
 /**
  * struct reg_field - Description of an register field
  *
@@ -1410,6 +1425,27 @@ static inline int regmap_update_bits_base(struct regmap *map, unsigned int reg,
 	return -EINVAL;
 }
 
+static inline int regmap_set_bits(struct regmap *map,
+				  unsigned int reg, unsigned int bits)
+{
+	WARN_ONCE(1, "regmap API is disabled");
+	return -EINVAL;
+}
+
+static inline int regmap_clear_bits(struct regmap *map,
+				    unsigned int reg, unsigned int bits)
+{
+	WARN_ONCE(1, "regmap API is disabled");
+	return -EINVAL;
+}
+
+static inline int regmap_test_bits(struct regmap *map,
+				   unsigned int reg, unsigned int bits)
+{
+	WARN_ONCE(1, "regmap API is disabled");
+	return -EINVAL;
+}
+
 static inline int regmap_field_update_bits_base(struct regmap_field *field,
 					unsigned int mask, unsigned int val,
 					bool *change, bool async, bool force)
-- 
2.26.1


_______________________________________________
Linux-mediatek mailing list
Linux-mediatek@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-mediatek

[PATCH v2 2/2] net: ethernet: mtk-star-emac: use regmap bitops

[Bartosz Golaszewski]

From: Bartosz Golaszewski <bgolaszewski@baylibre.com>

Shrink the code visually by replacing regmap_update_bits() with
appropriate regmap bit operations where applicable.

Signed-off-by: Bartosz Golaszewski <bgolaszewski@baylibre.com>
---
 drivers/net/ethernet/mediatek/mtk_star_emac.c | 80 ++++++++-----------
 1 file changed, 35 insertions(+), 45 deletions(-)

diff --git a/drivers/net/ethernet/mediatek/mtk_star_emac.c b/drivers/net/ethernet/mediatek/mtk_star_emac.c
index 8596ca0e60eb..326ac792a4a0 100644
--- a/drivers/net/ethernet/mediatek/mtk_star_emac.c
+++ b/drivers/net/ethernet/mediatek/mtk_star_emac.c
@@ -413,8 +413,8 @@ static void mtk_star_dma_unmap_tx(struct mtk_star_priv *priv,
 
 static void mtk_star_nic_disable_pd(struct mtk_star_priv *priv)
 {
-	regmap_update_bits(priv->regs, MTK_STAR_REG_MAC_CFG,
-			   MTK_STAR_BIT_MAC_CFG_NIC_PD, 0);
+	regmap_clear_bits(priv->regs, MTK_STAR_REG_MAC_CFG,
+			  MTK_STAR_BIT_MAC_CFG_NIC_PD);
 }
 
 /* Unmask the three interrupts we care about, mask all others. */
@@ -434,41 +434,38 @@ static void mtk_star_intr_disable(struct mtk_star_priv *priv)
 
 static void mtk_star_intr_enable_tx(struct mtk_star_priv *priv)
 {
-	regmap_update_bits(priv->regs, MTK_STAR_REG_INT_MASK,
-			   MTK_STAR_BIT_INT_STS_TNTC, 0);
+	regmap_clear_bits(priv->regs, MTK_STAR_REG_INT_MASK,
+			  MTK_STAR_BIT_INT_STS_TNTC);
 }
 
 static void mtk_star_intr_enable_rx(struct mtk_star_priv *priv)
 {
-	regmap_update_bits(priv->regs, MTK_STAR_REG_INT_MASK,
-			   MTK_STAR_BIT_INT_STS_FNRC, 0);
+	regmap_clear_bits(priv->regs, MTK_STAR_REG_INT_MASK,
+			  MTK_STAR_BIT_INT_STS_FNRC);
 }
 
 static void mtk_star_intr_enable_stats(struct mtk_star_priv *priv)
 {
-	regmap_update_bits(priv->regs, MTK_STAR_REG_INT_MASK,
-			   MTK_STAR_REG_INT_STS_MIB_CNT_TH, 0);
+	regmap_clear_bits(priv->regs, MTK_STAR_REG_INT_MASK,
+			  MTK_STAR_REG_INT_STS_MIB_CNT_TH);
 }
 
 static void mtk_star_intr_disable_tx(struct mtk_star_priv *priv)
 {
-	regmap_update_bits(priv->regs, MTK_STAR_REG_INT_MASK,
-			   MTK_STAR_BIT_INT_STS_TNTC,
-			   MTK_STAR_BIT_INT_STS_TNTC);
+	regmap_set_bits(priv->regs, MTK_STAR_REG_INT_MASK,
+			MTK_STAR_BIT_INT_STS_TNTC);
 }
 
 static void mtk_star_intr_disable_rx(struct mtk_star_priv *priv)
 {
-	regmap_update_bits(priv->regs, MTK_STAR_REG_INT_MASK,
-			   MTK_STAR_BIT_INT_STS_FNRC,
-			   MTK_STAR_BIT_INT_STS_FNRC);
+	regmap_set_bits(priv->regs, MTK_STAR_REG_INT_MASK,
+			MTK_STAR_BIT_INT_STS_FNRC);
 }
 
 static void mtk_star_intr_disable_stats(struct mtk_star_priv *priv)
 {
-	regmap_update_bits(priv->regs, MTK_STAR_REG_INT_MASK,
-			   MTK_STAR_REG_INT_STS_MIB_CNT_TH,
-			   MTK_STAR_REG_INT_STS_MIB_CNT_TH);
+	regmap_set_bits(priv->regs, MTK_STAR_REG_INT_MASK,
+			MTK_STAR_REG_INT_STS_MIB_CNT_TH);
 }
 
 static unsigned int mtk_star_intr_read(struct mtk_star_priv *priv)
@@ -524,12 +521,10 @@ static void mtk_star_dma_init(struct mtk_star_priv *priv)
 
 static void mtk_star_dma_start(struct mtk_star_priv *priv)
 {
-	regmap_update_bits(priv->regs, MTK_STAR_REG_TX_DMA_CTRL,
-			   MTK_STAR_BIT_TX_DMA_CTRL_START,
-			   MTK_STAR_BIT_TX_DMA_CTRL_START);
-	regmap_update_bits(priv->regs, MTK_STAR_REG_RX_DMA_CTRL,
-			   MTK_STAR_BIT_RX_DMA_CTRL_START,
-			   MTK_STAR_BIT_RX_DMA_CTRL_START);
+	regmap_set_bits(priv->regs, MTK_STAR_REG_TX_DMA_CTRL,
+			MTK_STAR_BIT_TX_DMA_CTRL_START);
+	regmap_set_bits(priv->regs, MTK_STAR_REG_RX_DMA_CTRL,
+			MTK_STAR_BIT_RX_DMA_CTRL_START);
 }
 
 static void mtk_star_dma_stop(struct mtk_star_priv *priv)
@@ -553,16 +548,14 @@ static void mtk_star_dma_disable(struct mtk_star_priv *priv)
 
 static void mtk_star_dma_resume_rx(struct mtk_star_priv *priv)
 {
-	regmap_update_bits(priv->regs, MTK_STAR_REG_RX_DMA_CTRL,
-			   MTK_STAR_BIT_RX_DMA_CTRL_RESUME,
-			   MTK_STAR_BIT_RX_DMA_CTRL_RESUME);
+	regmap_set_bits(priv->regs, MTK_STAR_REG_RX_DMA_CTRL,
+			MTK_STAR_BIT_RX_DMA_CTRL_RESUME);
 }
 
 static void mtk_star_dma_resume_tx(struct mtk_star_priv *priv)
 {
-	regmap_update_bits(priv->regs, MTK_STAR_REG_TX_DMA_CTRL,
-			   MTK_STAR_BIT_TX_DMA_CTRL_RESUME,
-			   MTK_STAR_BIT_TX_DMA_CTRL_RESUME);
+	regmap_set_bits(priv->regs, MTK_STAR_REG_TX_DMA_CTRL,
+			MTK_STAR_BIT_TX_DMA_CTRL_RESUME);
 }
 
 static void mtk_star_set_mac_addr(struct net_device *ndev)
@@ -845,8 +838,8 @@ static int mtk_star_hash_wait_ok(struct mtk_star_priv *priv)
 		return ret;
 
 	/* Check the BIST_OK bit. */
-	regmap_read(priv->regs, MTK_STAR_REG_HASH_CTRL, &val);
-	if (!(val & MTK_STAR_BIT_HASH_CTRL_BIST_OK))
+	if (!regmap_test_bits(priv->regs, MTK_STAR_REG_HASH_CTRL,
+			      MTK_STAR_BIT_HASH_CTRL_BIST_OK))
 		return -EIO;
 
 	return 0;
@@ -880,12 +873,10 @@ static int mtk_star_reset_hash_table(struct mtk_star_priv *priv)
 	if (ret)
 		return ret;
 
-	regmap_update_bits(priv->regs, MTK_STAR_REG_HASH_CTRL,
-			   MTK_STAR_BIT_HASH_CTRL_BIST_EN,
-			   MTK_STAR_BIT_HASH_CTRL_BIST_EN);
-	regmap_update_bits(priv->regs, MTK_STAR_REG_TEST1,
-			   MTK_STAR_BIT_TEST1_RST_HASH_MBIST,
-			   MTK_STAR_BIT_TEST1_RST_HASH_MBIST);
+	regmap_set_bits(priv->regs, MTK_STAR_REG_HASH_CTRL,
+			MTK_STAR_BIT_HASH_CTRL_BIST_EN);
+	regmap_set_bits(priv->regs, MTK_STAR_REG_TEST1,
+			MTK_STAR_BIT_TEST1_RST_HASH_MBIST);
 
 	return mtk_star_hash_wait_ok(priv);
 }
@@ -1016,13 +1007,13 @@ static int mtk_star_enable(struct net_device *ndev)
 		return ret;
 
 	/* Setup the hashing algorithm */
-	regmap_update_bits(priv->regs, MTK_STAR_REG_ARL_CFG,
-			   MTK_STAR_BIT_ARL_CFG_HASH_ALG |
-			   MTK_STAR_BIT_ARL_CFG_MISC_MODE, 0);
+	regmap_clear_bits(priv->regs, MTK_STAR_REG_ARL_CFG,
+			  MTK_STAR_BIT_ARL_CFG_HASH_ALG |
+			  MTK_STAR_BIT_ARL_CFG_MISC_MODE);
 
 	/* Don't strip VLAN tags */
-	regmap_update_bits(priv->regs, MTK_STAR_REG_MAC_CFG,
-			   MTK_STAR_BIT_MAC_CFG_VLAN_STRIP, 0);
+	regmap_clear_bits(priv->regs, MTK_STAR_REG_MAC_CFG,
+			  MTK_STAR_BIT_MAC_CFG_VLAN_STRIP);
 
 	/* Setup DMA */
 	mtk_star_dma_init(priv);
@@ -1204,9 +1195,8 @@ static void mtk_star_set_rx_mode(struct net_device *ndev)
 	int ret;
 
 	if (ndev->flags & IFF_PROMISC) {
-		regmap_update_bits(priv->regs, MTK_STAR_REG_ARL_CFG,
-				   MTK_STAR_BIT_ARL_CFG_MISC_MODE,
-				   MTK_STAR_BIT_ARL_CFG_MISC_MODE);
+		regmap_set_bits(priv->regs, MTK_STAR_REG_ARL_CFG,
+				MTK_STAR_BIT_ARL_CFG_MISC_MODE);
 	} else if (netdev_mc_count(ndev) > MTK_STAR_HASHTABLE_MC_LIMIT ||
 		   ndev->flags & IFF_ALLMULTI) {
 		for (i = 0; i < MTK_STAR_HASHTABLE_SIZE_MAX; i++) {
-- 
2.26.1


_______________________________________________
Linux-mediatek mailing list
Linux-mediatek@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-mediatek

Re: [PATCH v2 1/2] regmap: provide helpers for simple bit operations

[Mark Brown]

[-- Attachment #1.1: Type: text/plain, Size: 224 bytes --]

On Thu, May 28, 2020 at 04:22:40PM +0200, Bartosz Golaszewski wrote:

> +	return (val & bits) == bits ? 1 : 0;

The tenery here is redundant, it's converting a boolean value into a
boolean value.  Otherwise this looks good.

[-- Attachment #1.2: signature.asc --]
[-- Type: application/pgp-signature, Size: 488 bytes --]

[-- Attachment #2: Type: text/plain, Size: 170 bytes --]

_______________________________________________
Linux-mediatek mailing list
Linux-mediatek@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-mediatek

Re: [PATCH v2 1/2] regmap: provide helpers for simple bit operations

[Bartosz Golaszewski]

czw., 28 maj 2020 o 16:45 Mark Brown <broonie@kernel.org> napisał(a):
>
> On Thu, May 28, 2020 at 04:22:40PM +0200, Bartosz Golaszewski wrote:
>
> > +     return (val & bits) == bits ? 1 : 0;
>
> The tenery here is redundant, it's converting a boolean value into a
> boolean value.  Otherwise this looks good.

Do you mind if I respin it right away? I don't want to spam the list.

Bartosz

_______________________________________________
Linux-mediatek mailing list
Linux-mediatek@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-mediatek

Re: [PATCH v2 1/2] regmap: provide helpers for simple bit operations

[Mark Brown]

[-- Attachment #1.1: Type: text/plain, Size: 362 bytes --]

On Thu, May 28, 2020 at 04:49:06PM +0200, Bartosz Golaszewski wrote:
> czw., 28 maj 2020 o 16:45 Mark Brown <broonie@kernel.org> napisał(a):

> > The tenery here is redundant, it's converting a boolean value into a
> > boolean value.  Otherwise this looks good.

> Do you mind if I respin it right away? I don't want to spam the list.

Sure, go ahead.

[-- Attachment #1.2: signature.asc --]
[-- Type: application/pgp-signature, Size: 484 bytes --]

[-- Attachment #2: Type: text/plain, Size: 170 bytes --]

_______________________________________________
Linux-mediatek mailing list
Linux-mediatek@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-mediatek