diff mbox series

[2/2] media: ov08x40: Reduce start streaming time

Message ID 20240204215328.694421-2-sakari.ailus@linux.intel.com (mailing list archive)
State New, archived
Headers show
Series [1/2] Revert "media: ov08x40: Reduce start streaming time" | expand

Commit Message

Sakari Ailus Feb. 4, 2024, 9:53 p.m. UTC
From: Jason Chen <jason.z.chen@intel.com>

Because video duration involves calculating the streaming time, and i2c
communication incurs too many XTALK register settings every 4 bytes with
i2c START and STOP.

So we have opted switch to the i2c burst method.
This method involves writing the XTALK registers in the order of
the register block.

The start streaming time can be reduced from around 400ms to 150ms

[Sakari Ailus: Drop unneeded dev_dbg().]

Signed-off-by: Jason Chen <jason.z.chen@intel.com>
Reviewed-by: Sergey Senozhatsky <senozhatsky@chromium.org>
Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
---
 drivers/media/i2c/ov08x40.c | 1209 ++---------------------------------
 1 file changed, 57 insertions(+), 1152 deletions(-)
diff mbox series

Patch

diff --git a/drivers/media/i2c/ov08x40.c b/drivers/media/i2c/ov08x40.c
index 010a6017e1ad..48df077522ad 100644
--- a/drivers/media/i2c/ov08x40.c
+++ b/drivers/media/i2c/ov08x40.c
@@ -1,6 +1,7 @@ 
 // SPDX-License-Identifier: GPL-2.0
 // Copyright (c) 2022 Intel Corporation.
 
+#include <asm-generic/unaligned.h>
 #include <linux/acpi.h>
 #include <linux/i2c.h>
 #include <linux/module.h>
@@ -95,6 +96,12 @@ 
 /* Vertical Window Offset */
 #define OV08X40_REG_V_WIN_OFFSET	0x3813
 
+/* Burst Register */
+#define OV08X40_REG_XTALK_FIRST_A	0x5a80
+#define OV08X40_REG_XTALK_LAST_A	0x5b9f
+#define OV08X40_REG_XTALK_FIRST_B	0x5bc0
+#define OV08X40_REG_XTALK_LAST_B	0x5f1f
+
 enum {
 	OV08X40_LINK_FREQ_400MHZ_INDEX,
 };
@@ -670,1158 +677,6 @@  static const struct ov08x40_reg mode_3856x2416_regs[] = {
 	{0x3502, 0x10},
 	{0x3508, 0x0f},
 	{0x3509, 0x80},
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-	{0x5e9a, 0x75},
-	{0x5e9b, 0x75},
-	{0x5e9c, 0x75},
-	{0x5e9d, 0x75},
-	{0x5e9e, 0x75},
-	{0x5e9f, 0x75},
-	{0x5ea0, 0x75},
-	{0x5ea1, 0x75},
-	{0x5ea2, 0x75},
-	{0x5ea3, 0x75},
-	{0x5ea4, 0x75},
-	{0x5ea5, 0x75},
-	{0x5ea6, 0x75},
-	{0x5ea7, 0x75},
-	{0x5ea8, 0x75},
-	{0x5ea9, 0x75},
-	{0x5eaa, 0x75},
-	{0x5eab, 0x75},
-	{0x5eac, 0x75},
-	{0x5ead, 0x75},
-	{0x5eae, 0x75},
-	{0x5eaf, 0x75},
-	{0x5eb0, 0x75},
-	{0x5eb1, 0x75},
-	{0x5eb2, 0x75},
-	{0x5eb3, 0x75},
-	{0x5eb4, 0x75},
-	{0x5eb5, 0x75},
-	{0x5eb6, 0x75},
-	{0x5eb7, 0x75},
-	{0x5eb8, 0x75},
-	{0x5eb9, 0x75},
-	{0x5eba, 0x75},
-	{0x5ebb, 0x75},
-	{0x5ebc, 0x75},
-	{0x5ebd, 0x75},
-	{0x5ebe, 0x75},
-	{0x5ebf, 0x75},
-	{0x5ec0, 0x75},
-	{0x5ec1, 0x75},
-	{0x5ec2, 0x75},
-	{0x5ec3, 0x75},
-	{0x5ec4, 0x75},
-	{0x5ec5, 0x75},
-	{0x5ec6, 0x75},
-	{0x5ec7, 0x75},
-	{0x5ec8, 0x75},
-	{0x5ec9, 0x75},
-	{0x5eca, 0x75},
-	{0x5ecb, 0x75},
-	{0x5ecc, 0x75},
-	{0x5ecd, 0x75},
-	{0x5ece, 0x75},
-	{0x5ecf, 0x75},
-	{0x5ed0, 0x75},
-	{0x5ed1, 0x75},
-	{0x5ed2, 0x75},
-	{0x5ed3, 0x75},
-	{0x5ed4, 0x75},
-	{0x5ed5, 0x75},
-	{0x5ed6, 0x75},
-	{0x5ed7, 0x75},
-	{0x5ed8, 0x75},
-	{0x5ed9, 0x75},
-	{0x5eda, 0x75},
-	{0x5edb, 0x75},
-	{0x5edc, 0x75},
-	{0x5edd, 0x75},
-	{0x5ede, 0x75},
-	{0x5edf, 0x75},
-	{0x5ee0, 0x75},
-	{0x5ee1, 0x75},
-	{0x5ee2, 0x75},
-	{0x5ee3, 0x75},
-	{0x5ee4, 0x75},
-	{0x5ee5, 0x75},
-	{0x5ee6, 0x75},
-	{0x5ee7, 0x75},
-	{0x5ee8, 0x75},
-	{0x5ee9, 0x75},
-	{0x5eea, 0x75},
-	{0x5eeb, 0x75},
-	{0x5eec, 0x75},
-	{0x5eed, 0x75},
-	{0x5eee, 0x75},
-	{0x5eef, 0x75},
-	{0x5ef0, 0x75},
-	{0x5ef1, 0x75},
-	{0x5ef2, 0x75},
-	{0x5ef3, 0x75},
-	{0x5ef4, 0x75},
-	{0x5ef5, 0x75},
-	{0x5ef6, 0x75},
-	{0x5ef7, 0x75},
-	{0x5ef8, 0x75},
-	{0x5ef9, 0x75},
-	{0x5efa, 0x75},
-	{0x5efb, 0x75},
-	{0x5efc, 0x75},
-	{0x5efd, 0x75},
-	{0x5efe, 0x75},
-	{0x5eff, 0x75},
-	{0x5f00, 0x75},
-	{0x5f01, 0x75},
-	{0x5f02, 0x75},
-	{0x5f03, 0x75},
-	{0x5f04, 0x75},
-	{0x5f05, 0x75},
-	{0x5f06, 0x75},
-	{0x5f07, 0x75},
-	{0x5f08, 0x75},
-	{0x5f09, 0x75},
-	{0x5f0a, 0x75},
-	{0x5f0b, 0x75},
-	{0x5f0c, 0x75},
-	{0x5f0d, 0x75},
-	{0x5f0e, 0x75},
-	{0x5f0f, 0x75},
-	{0x5f10, 0x75},
-	{0x5f11, 0x75},
-	{0x5f12, 0x75},
-	{0x5f13, 0x75},
-	{0x5f14, 0x75},
-	{0x5f15, 0x75},
-	{0x5f16, 0x75},
-	{0x5f17, 0x75},
-	{0x5f18, 0x75},
-	{0x5f19, 0x75},
-	{0x5f1a, 0x75},
-	{0x5f1b, 0x75},
-	{0x5f1c, 0x75},
-	{0x5f1d, 0x75},
-	{0x5f1e, 0x75},
-	{0x5f1f, 0x75},
 };
 
 static const struct ov08x40_reg mode_1928x1208_regs[] = {
@@ -2484,6 +1339,40 @@  static int ov08x40_read_reg(struct ov08x40 *ov08x,
 	return 0;
 }
 
+static int ov08x40_burst_fill_regs(struct ov08x40 *ov08x, u16 first_reg,
+				   u16 last_reg,  u8 val)
+{
+	struct i2c_client *client = v4l2_get_subdevdata(&ov08x->sd);
+	struct i2c_msg msgs;
+	size_t i, num_regs;
+	int ret;
+
+	num_regs = last_reg - first_reg + 1;
+	msgs.addr = client->addr;
+	msgs.flags = 0;
+	msgs.len = 2 + num_regs;
+	msgs.buf = kmalloc(msgs.len, GFP_KERNEL);
+
+	if (!msgs.buf)
+		return -ENOMEM;
+
+	put_unaligned_be16(first_reg, msgs.buf);
+
+	for (i = 0; i < num_regs; ++i)
+		msgs.buf[2 + i] = val;
+
+	ret = i2c_transfer(client->adapter, &msgs, 1);
+
+	kfree(msgs.buf);
+
+	if (ret != 1) {
+		dev_err(&client->dev, "Failed regs transferred: %d\n", ret);
+		return -EIO;
+	}
+
+	return 0;
+}
+
 /* Write registers up to 4 at a time */
 static int ov08x40_write_reg(struct ov08x40 *ov08x,
 			     u16 reg, u32 len, u32 __val)
@@ -2924,6 +1813,22 @@  static int ov08x40_start_streaming(struct ov08x40 *ov08x)
 		return ret;
 	}
 
+	/* Use i2c burst to write register on full size registers */
+	if (ov08x->cur_mode->exposure_shift == 1) {
+		ret = ov08x40_burst_fill_regs(ov08x, OV08X40_REG_XTALK_FIRST_A,
+					      OV08X40_REG_XTALK_LAST_A, 0x75);
+		if (ret == 0)
+			ret = ov08x40_burst_fill_regs(ov08x,
+						      OV08X40_REG_XTALK_FIRST_B,
+						      OV08X40_REG_XTALK_LAST_B,
+						      0x75);
+	}
+
+	if (ret) {
+		dev_err(&client->dev, "%s failed to set regs\n", __func__);
+		return ret;
+	}
+
 	/* Apply customized values from user */
 	ret =  __v4l2_ctrl_handler_setup(ov08x->sd.ctrl_handler);
 	if (ret)