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79 lines
2.6 KiB
Diff
79 lines
2.6 KiB
Diff
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From 1c779e83e5f78cadcd8dfc6cfca33e7aeb323f27 Mon Sep 17 00:00:00 2001
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From: Dave Stevenson <dave.stevenson@raspberrypi.com>
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Date: Thu, 17 Feb 2022 16:44:33 +0000
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Subject: [PATCH] media: i2c: ov7251: Limit exposure based on VTS
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The maximum exposure is dictated by VTS, so compute it rather
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than having the value in the mode table.
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Signed-off-by: Dave Stevenson <dave.stevenson@raspberrypi.com>
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---
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drivers/media/i2c/ov7251.c | 14 ++++++--------
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1 file changed, 6 insertions(+), 8 deletions(-)
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--- a/drivers/media/i2c/ov7251.c
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+++ b/drivers/media/i2c/ov7251.c
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@@ -37,6 +37,8 @@
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#define OV7251_AEC_EXPO_2 0x3502
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#define OV7251_AEC_AGC_ADJ_0 0x350a
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#define OV7251_AEC_AGC_ADJ_1 0x350b
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+/* Exposure must be at least 20 lines shorter than VTS */
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+#define OV7251_EXPOSURE_OFFSET 20
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/* HTS is registers 0x380c and 0x380d */
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#define OV7251_HTS 0x3a0
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#define OV7251_VTS_HIGH 0x380e
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@@ -82,7 +84,6 @@ struct ov7251_mode_info {
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u32 height;
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const struct reg_value *data;
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u32 data_size;
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- u16 exposure_max;
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u16 exposure_def;
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u16 vts;
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struct v4l2_fract timeperframe;
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@@ -348,7 +349,6 @@ static const struct ov7251_mode_info ov7
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.height = 480,
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.data = ov7251_setting_vga,
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.data_size = ARRAY_SIZE(ov7251_setting_vga),
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- .exposure_max = 1704,
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.exposure_def = 504,
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.vts = 0x6bc,
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.timeperframe = {
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@@ -361,7 +361,6 @@ static const struct ov7251_mode_info ov7
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.height = 480,
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.data = ov7251_setting_vga,
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.data_size = ARRAY_SIZE(ov7251_setting_vga),
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- .exposure_max = 840,
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.exposure_def = 504,
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.vts = 0x35c,
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.timeperframe = {
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@@ -374,7 +373,6 @@ static const struct ov7251_mode_info ov7
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.height = 480,
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.data = ov7251_setting_vga,
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.data_size = ARRAY_SIZE(ov7251_setting_vga),
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- .exposure_max = 552,
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.exposure_def = 504,
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.vts = 0x23c,
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.timeperframe = {
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@@ -915,8 +913,8 @@ static int ov7251_set_format(struct v4l2
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h_blank, 1, h_blank);
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__v4l2_ctrl_s_ctrl(ov7251->hblank, h_blank);
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- ret = __v4l2_ctrl_modify_range(ov7251->exposure,
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- 1, new_mode->exposure_max,
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+ ret = __v4l2_ctrl_modify_range(ov7251->exposure, 1,
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+ new_mode->vts - OV7251_EXPOSURE_OFFSET,
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1, new_mode->exposure_def);
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if (ret < 0)
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goto exit;
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@@ -1092,8 +1090,8 @@ static int ov7251_set_frame_interval(str
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new_mode = ov7251_find_mode_by_ival(ov7251, &fi->interval);
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if (new_mode != ov7251->current_mode) {
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- ret = __v4l2_ctrl_modify_range(ov7251->exposure,
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- 1, new_mode->exposure_max,
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+ ret = __v4l2_ctrl_modify_range(ov7251->exposure, 1,
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+ new_mode->vts - OV7251_EXPOSURE_OFFSET,
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1, new_mode->exposure_def);
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if (ret < 0)
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goto exit;
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