Gitweb: http://git.kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=624fc7f52b48f69fd9d1fe7a594c211762c89825 Commit: 624fc7f52b48f69fd9d1fe7a594c211762c89825 Parent: 05f85839a2ffcaa75d505526ca8e74097be18d8c Author: Russell King <[EMAIL PROTECTED]> AuthorDate: Sat May 26 07:55:32 2007 -0300 Committer: Mauro Carvalho Chehab <[EMAIL PROTECTED]> CommitDate: Fri Jun 8 08:21:12 2007 -0300
V4L/DVB (5700): Saa7111: fix picture settings cache bug If the SAA7111 device is powered down, and requires re-initialisation when the V4L device is opened (as on the NetWinder), the SAA7111 driver gets completely confused about the current settings. The problem is centred around the way the driver keeps _two_ cached copies of the current settings - one of the struct video_picture settings, and one of the registers. When the decoder is re-initailised, the cached register settings are overwritten, as are the values in the hardware registers. However, the cached video_picture settings are not. Resolve this by removing the useless and buggy second level of caching for video_picture. Instead, provide a function which updates register values if and only if the value we are going to write to the register has changed. Signed-off-by: Russell King <[EMAIL PROTECTED]> Signed-off-by: Andrew Morton <[EMAIL PROTECTED]> Signed-off-by: Mauro Carvalho Chehab <[EMAIL PROTECTED]> --- drivers/media/video/saa7111.c | 49 ++++++++++++++++------------------------- 1 files changed, 19 insertions(+), 30 deletions(-) diff --git a/drivers/media/video/saa7111.c b/drivers/media/video/saa7111.c index 74839f9..c1a392e 100644 --- a/drivers/media/video/saa7111.c +++ b/drivers/media/video/saa7111.c @@ -75,10 +75,6 @@ struct saa7111 { int norm; int input; int enable; - int bright; - int contrast; - int hue; - int sat; }; #define I2C_SAA7111 0x48 @@ -96,6 +92,17 @@ saa7111_write (struct i2c_client *client, return i2c_smbus_write_byte_data(client, reg, value); } +static inline void +saa7111_write_if_changed(struct i2c_client *client, u8 reg, u8 value) +{ + struct saa7111 *decoder = i2c_get_clientdata(client); + + if (decoder->reg[reg] != value) { + decoder->reg[reg] = value; + i2c_smbus_write_byte_data(client, reg, value); + } +} + static int saa7111_write_block (struct i2c_client *client, const u8 *data, @@ -439,28 +446,14 @@ saa7111_command (struct i2c_client *client, { struct video_picture *pic = arg; - if (decoder->bright != pic->brightness) { - /* We want 0 to 255 we get 0-65535 */ - decoder->bright = pic->brightness; - saa7111_write(client, 0x0a, decoder->bright >> 8); - } - if (decoder->contrast != pic->contrast) { - /* We want 0 to 127 we get 0-65535 */ - decoder->contrast = pic->contrast; - saa7111_write(client, 0x0b, - decoder->contrast >> 9); - } - if (decoder->sat != pic->colour) { - /* We want 0 to 127 we get 0-65535 */ - decoder->sat = pic->colour; - saa7111_write(client, 0x0c, decoder->sat >> 9); - } - if (decoder->hue != pic->hue) { - /* We want -128 to 127 we get 0-65535 */ - decoder->hue = pic->hue; - saa7111_write(client, 0x0d, - (decoder->hue - 32768) >> 8); - } + /* We want 0 to 255 we get 0-65535 */ + saa7111_write_if_changed(client, 0x0a, pic->brightness >> 8); + /* We want 0 to 127 we get 0-65535 */ + saa7111_write(client, 0x0b, pic->contrast >> 9); + /* We want 0 to 127 we get 0-65535 */ + saa7111_write(client, 0x0c, pic->colour >> 9); + /* We want -128 to 127 we get 0-65535 */ + saa7111_write(client, 0x0d, (pic->hue - 32768) >> 8); } break; @@ -524,10 +517,6 @@ saa7111_detect_client (struct i2c_adapter *adapter, decoder->norm = VIDEO_MODE_NTSC; decoder->input = 0; decoder->enable = 1; - decoder->bright = 32768; - decoder->contrast = 32768; - decoder->hue = 32768; - decoder->sat = 32768; i2c_set_clientdata(client, decoder); i = i2c_attach_client(client); - To unsubscribe from this list: send the line "unsubscribe git-commits-head" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html