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media: cx231xx: Fix AGC levels for NTSC-M

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Windows uses the implemented command sequence to set AGC for NTSC-M.
The previous Linux values work, mostly, but on some embedded
platforms NTSC-M is very unstable. The Windows default values
completely fix any signal stability issues and produce a clear image.

Signed-off-by: Bradford Love <brad@nextdimension.cc>
Signed-off-by: Hans Verkuil <hverkuil+cisco@kernel.org>
This commit is contained in:
Bradford Love
2026-03-17 10:50:19 +01:00
committed by Hans Verkuil
parent bad32ae441
commit 69426c6c9b
1 changed files with 3 additions and 4 deletions
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drivers/media/usb/cx231xx/cx231xx-avcore.c
+3 -4
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@@ -2027,10 +2027,9 @@ int cx231xx_dif_set_standard(struct cx231xx *dev, u32 standard)
status = vid_blk_write_word(dev, DIF_SRC_GAIN_CONTROL,
0x000035e8);
status = vid_blk_write_word(dev, DIF_AGC_CTRL_IF, 0xC2262600);
status = vid_blk_write_word(dev, DIF_AGC_CTRL_INT,
0xC2262600);
status = vid_blk_write_word(dev, DIF_AGC_CTRL_RF, 0xC2262600);
status = vid_blk_write_word(dev, DIF_AGC_CTRL_IF, 0xC2262600);
status = vid_blk_write_word(dev, DIF_AGC_CTRL_INT, 0xC2260000);
status = vid_blk_write_word(dev, DIF_AGC_CTRL_RF, 0xC2260000);
/* Save the Spec Inversion value */
dif_misc_ctrl_value &= FLD_DIF_SPEC_INV;