| Message ID | 20140109120500.6abc6cd2@armhf (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
On Thu, Jan 09, 2014 at 12:05:00PM +0100, Jean-Francois Moine wrote:
> This patch changes the video quantization to RGB/YUV.
Strong NAK, this patch is definitely incorrect.
The Cubox (which I assume is the platform you're generating these patches
for) produces RGB at it's output, which are the RGB values from the
framebuffer. Being a computer-like "IT" source, these RGB values have the
full range, from zero to 255, rather than the limited range of 16 to 235.
With limited range, a value of 16 is black and 235 is white. However, the
values in the framebuffer will be zero for black and 255 for white.
A VQR value of 1 gives limited range of 16 to 235, whereas zero gives
full range. The value of zero is correct here.
diff --git a/drivers/gpu/drm/i2c/tda998x_drv.c b/drivers/gpu/drm/i2c/tda998x_drv.c index 91bd4e8..f60aef9 100644 --- a/drivers/gpu/drm/i2c/tda998x_drv.c +++ b/drivers/gpu/drm/i2c/tda998x_drv.c @@ -992,7 +992,9 @@ tda998x_encoder_mode_set(struct drm_encoder *encoder, reg_clear(priv, REG_PLL_SERIAL_1, PLL_SERIAL_1_SRL_MAN_IZ); reg_clear(priv, REG_PLL_SERIAL_3, PLL_SERIAL_3_SRL_DE); reg_write(priv, REG_SERIALIZER, 0); - reg_write(priv, REG_HVF_CNTRL_1, HVF_CNTRL_1_VQR(0)); + + /* video quantization range = 0: full, 1: RGB/YUV, 2: YUV */ + reg_write(priv, REG_HVF_CNTRL_1, HVF_CNTRL_1_VQR(1)); /* TODO enable pixel repeat for pixel rates less than 25Msamp/s */ rep = 0;
This patch changes the video quantization to RGB/YUV. Signed-off-by: Jean-Francois Moine <moinejf@free.fr> --- drivers/gpu/drm/i2c/tda998x_drv.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-)