diff mbox series

[v2,5/8] media: rcar-csi2: Add helper to lookup mbps settings

Message ID 20240830203104.3479124-6-niklas.soderlund+renesas@ragnatech.se (mailing list archive)
State New
Headers
Series media: rcar-csi2: Add support for V4M |

Commit Message

Niklas Söderlund Aug. 30, 2024, 8:31 p.m. UTC 
  The structure mapping a configuration information to a particular mpbs
setting needs to be extended with more information to support future
SoCs. Before it is extended reduce code duplication by creating a helper
to lookup information from an array of mbps setting, the lookup code
has already been copied to two speared locations.

While at it rename the structure to make it clear it contains
information related to a mbps setting, not just a single register value.

Signed-off-by: Niklas Söderlund <niklas.soderlund+renesas@ragnatech.se>
---
 drivers/media/platform/renesas/rcar-csi2.c | 90 +++++++++++-----------
 1 file changed, 45 insertions(+), 45 deletions(-)
diff mbox series

Patch

diff --git a/drivers/media/platform/renesas/rcar-csi2.c b/drivers/media/platform/renesas/rcar-csi2.c
index 4e85c47817a1..0c65c6aa7260 100644
--- a/drivers/media/platform/renesas/rcar-csi2.c
+++ b/drivers/media/platform/renesas/rcar-csi2.c
@@ -242,12 +242,12 @@  struct phtw_value {
 	u8 code;
 };
 
-struct rcsi2_mbps_reg {
+struct rcsi2_mbps_info {
 	u16 mbps;
 	u8 reg;
 };
 
-static const struct rcsi2_mbps_reg phtw_mbps_v3u[] = {
+static const struct rcsi2_mbps_info phtw_mbps_v3u[] = {
 	{ .mbps = 1500, .reg = 0xcc },
 	{ .mbps = 1550, .reg = 0x1d },
 	{ .mbps = 1600, .reg = 0x27 },
@@ -272,7 +272,7 @@  static const struct rcsi2_mbps_reg phtw_mbps_v3u[] = {
 	{ /* sentinel */ },
 };
 
-static const struct rcsi2_mbps_reg phtw_mbps_h3_v3h_m3n[] = {
+static const struct rcsi2_mbps_info phtw_mbps_h3_v3h_m3n[] = {
 	{ .mbps =   80, .reg = 0x86 },
 	{ .mbps =   90, .reg = 0x86 },
 	{ .mbps =  100, .reg = 0x87 },
@@ -292,7 +292,7 @@  static const struct rcsi2_mbps_reg phtw_mbps_h3_v3h_m3n[] = {
 	{ /* sentinel */ },
 };
 
-static const struct rcsi2_mbps_reg phtw_mbps_v3m_e3[] = {
+static const struct rcsi2_mbps_info phtw_mbps_v3m_e3[] = {
 	{ .mbps =   80, .reg = 0x00 },
 	{ .mbps =   90, .reg = 0x20 },
 	{ .mbps =  100, .reg = 0x40 },
@@ -336,7 +336,7 @@  static const struct rcsi2_mbps_reg phtw_mbps_v3m_e3[] = {
 #define PHYPLL_REG			0x68
 #define PHYPLL_HSFREQRANGE(n)		((n) << 16)
 
-static const struct rcsi2_mbps_reg hsfreqrange_v3u[] = {
+static const struct rcsi2_mbps_info hsfreqrange_v3u[] = {
 	{ .mbps =   80, .reg = 0x00 },
 	{ .mbps =   90, .reg = 0x10 },
 	{ .mbps =  100, .reg = 0x20 },
@@ -402,7 +402,7 @@  static const struct rcsi2_mbps_reg hsfreqrange_v3u[] = {
 	{ /* sentinel */ },
 };
 
-static const struct rcsi2_mbps_reg hsfreqrange_h3_v3h_m3n[] = {
+static const struct rcsi2_mbps_info hsfreqrange_h3_v3h_m3n[] = {
 	{ .mbps =   80, .reg = 0x00 },
 	{ .mbps =   90, .reg = 0x10 },
 	{ .mbps =  100, .reg = 0x20 },
@@ -449,7 +449,7 @@  static const struct rcsi2_mbps_reg hsfreqrange_h3_v3h_m3n[] = {
 	{ /* sentinel */ },
 };
 
-static const struct rcsi2_mbps_reg hsfreqrange_m3w[] = {
+static const struct rcsi2_mbps_info hsfreqrange_m3w[] = {
 	{ .mbps =   80,	.reg = 0x00 },
 	{ .mbps =   90,	.reg = 0x10 },
 	{ .mbps =  100,	.reg = 0x20 },
@@ -596,7 +596,7 @@  struct rcar_csi2_info {
 	int (*start_receiver)(struct rcar_csi2 *priv,
 			      struct v4l2_subdev_state *state);
 	void (*enter_standby)(struct rcar_csi2 *priv);
-	const struct rcsi2_mbps_reg *hsfreqrange;
+	const struct rcsi2_mbps_info *hsfreqrange;
 	unsigned int csi0clkfreqrange;
 	unsigned int num_channels;
 	bool clear_ulps;
@@ -662,6 +662,34 @@  static void rcsi2_write16(struct rcar_csi2 *priv, unsigned int reg, u16 data)
 	iowrite16(data, priv->base + reg);
 }
 
+static const struct rcsi2_mbps_info *
+rcsi2_mbps_to_info(struct rcar_csi2 *priv,
+		   const struct rcsi2_mbps_info *infotable, unsigned int mbps)
+{
+	const struct rcsi2_mbps_info *info;
+	const struct rcsi2_mbps_info *prev = NULL;
+
+	if (mbps < infotable->mbps)
+		dev_warn(priv->dev, "%u Mbps less than min PHY speed %u Mbps",
+			 mbps, infotable->mbps);
+
+	for (info = infotable; info->mbps != 0; info++) {
+		if (info->mbps >= mbps)
+			break;
+		prev = info;
+	}
+
+	if (!info->mbps) {
+		dev_err(priv->dev, "Unsupported PHY speed (%u Mbps)", mbps);
+		return NULL;
+	}
+
+	if (prev && ((mbps - prev->mbps) <= (info->mbps - mbps)))
+		info = prev;
+
+	return info;
+}
+
 static void rcsi2_enter_standby_gen3(struct rcar_csi2 *priv)
 {
 	rcsi2_write(priv, PHYCNT_REG, 0);
@@ -714,29 +742,13 @@  static int rcsi2_wait_phy_start(struct rcar_csi2 *priv,
 
 static int rcsi2_set_phypll(struct rcar_csi2 *priv, unsigned int mbps)
 {
-	const struct rcsi2_mbps_reg *hsfreq;
-	const struct rcsi2_mbps_reg *hsfreq_prev = NULL;
+	const struct rcsi2_mbps_info *info;
 
-	if (mbps < priv->info->hsfreqrange->mbps)
-		dev_warn(priv->dev, "%u Mbps less than min PHY speed %u Mbps",
-			 mbps, priv->info->hsfreqrange->mbps);
-
-	for (hsfreq = priv->info->hsfreqrange; hsfreq->mbps != 0; hsfreq++) {
-		if (hsfreq->mbps >= mbps)
-			break;
-		hsfreq_prev = hsfreq;
-	}
-
-	if (!hsfreq->mbps) {
-		dev_err(priv->dev, "Unsupported PHY speed (%u Mbps)", mbps);
+	info = rcsi2_mbps_to_info(priv, priv->info->hsfreqrange, mbps);
+	if (!info)
 		return -ERANGE;
-	}
 
-	if (hsfreq_prev &&
-	    ((mbps - hsfreq_prev->mbps) <= (hsfreq->mbps - mbps)))
-		hsfreq = hsfreq_prev;
-
-	rcsi2_write(priv, priv->info->regs->phypll, PHYPLL_HSFREQRANGE(hsfreq->reg));
+	rcsi2_write(priv, priv->info->regs->phypll, PHYPLL_HSFREQRANGE(info->reg));
 
 	return 0;
 }
@@ -1494,27 +1506,15 @@  static int rcsi2_phtw_write_array(struct rcar_csi2 *priv,
 }
 
 static int rcsi2_phtw_write_mbps(struct rcar_csi2 *priv, unsigned int mbps,
-				 const struct rcsi2_mbps_reg *values, u8 code)
+				 const struct rcsi2_mbps_info *values, u8 code)
 {
-	const struct rcsi2_mbps_reg *value;
-	const struct rcsi2_mbps_reg *prev_value = NULL;
+	const struct rcsi2_mbps_info *info;
 
-	for (value = values; value->mbps; value++) {
-		if (value->mbps >= mbps)
-			break;
-		prev_value = value;
-	}
-
-	if (prev_value &&
-	    ((mbps - prev_value->mbps) <= (value->mbps - mbps)))
-		value = prev_value;
-
-	if (!value->mbps) {
-		dev_err(priv->dev, "Unsupported PHY speed (%u Mbps)", mbps);
+	info = rcsi2_mbps_to_info(priv, values, mbps);
+	if (!info)
 		return -ERANGE;
-	}
 
-	return rcsi2_phtw_write(priv, value->reg, code);
+	return rcsi2_phtw_write(priv, info->reg, code);
 }
 
 static int __rcsi2_init_phtw_h3_v3h_m3n(struct rcar_csi2 *priv,