Commit 2034fc12 authored by Maxime Ripard's avatar Maxime Ripard

drm/vc4: hdmi: Define colorspace matrices

The current CSC setup code for the BCM2711 uses a sequence of register
writes to configure the CSC depending on whether we output using a full
or limited range.

However, with the upcoming introduction of the YUV output, we're going
to add new matrices to perform the conversions, so we should switch to
something a bit more flexible that takes the matrix as an argument and
programs the CSC accordingly.
Acked-by: default avatarThomas Zimmermann <tzimmermann@suse.de>
Signed-off-by: default avatarMaxime Ripard <maxime@cerno.tech>
Link: https://patchwork.freedesktop.org/patch/msgid/20220120151625.594595-10-maxime@cerno.tech
parent b718d847
...@@ -775,6 +775,51 @@ static void vc4_hdmi_csc_setup(struct vc4_hdmi *vc4_hdmi, ...@@ -775,6 +775,51 @@ static void vc4_hdmi_csc_setup(struct vc4_hdmi *vc4_hdmi,
spin_unlock_irqrestore(&vc4_hdmi->hw_lock, flags); spin_unlock_irqrestore(&vc4_hdmi->hw_lock, flags);
} }
/*
* If we need to output Full Range RGB, then use the unity matrix
*
* [ 1 0 0 0]
* [ 0 1 0 0]
* [ 0 0 1 0]
*
* Matrix is signed 2p13 fixed point, with signed 9p6 offsets
*/
static const u16 vc5_hdmi_csc_full_rgb_unity[3][4] = {
{ 0x2000, 0x0000, 0x0000, 0x0000 },
{ 0x0000, 0x2000, 0x0000, 0x0000 },
{ 0x0000, 0x0000, 0x2000, 0x0000 },
};
/*
* CEA VICs other than #1 require limited range RGB output unless
* overridden by an AVI infoframe. Apply a colorspace conversion to
* squash 0-255 down to 16-235. The matrix here is:
*
* [ 0.8594 0 0 16]
* [ 0 0.8594 0 16]
* [ 0 0 0.8594 16]
*
* Matrix is signed 2p13 fixed point, with signed 9p6 offsets
*/
static const u16 vc5_hdmi_csc_full_rgb_to_limited_rgb[3][4] = {
{ 0x1b80, 0x0000, 0x0000, 0x0400 },
{ 0x0000, 0x1b80, 0x0000, 0x0400 },
{ 0x0000, 0x0000, 0x1b80, 0x0400 },
};
static void vc5_hdmi_set_csc_coeffs(struct vc4_hdmi *vc4_hdmi,
const u16 coeffs[3][4])
{
lockdep_assert_held(&vc4_hdmi->hw_lock);
HDMI_WRITE(HDMI_CSC_12_11, (coeffs[0][1] << 16) | coeffs[0][0]);
HDMI_WRITE(HDMI_CSC_14_13, (coeffs[0][3] << 16) | coeffs[0][2]);
HDMI_WRITE(HDMI_CSC_22_21, (coeffs[1][1] << 16) | coeffs[1][0]);
HDMI_WRITE(HDMI_CSC_24_23, (coeffs[1][3] << 16) | coeffs[1][2]);
HDMI_WRITE(HDMI_CSC_32_31, (coeffs[2][1] << 16) | coeffs[2][0]);
HDMI_WRITE(HDMI_CSC_34_33, (coeffs[2][3] << 16) | coeffs[2][2]);
}
static void vc5_hdmi_csc_setup(struct vc4_hdmi *vc4_hdmi, static void vc5_hdmi_csc_setup(struct vc4_hdmi *vc4_hdmi,
const struct drm_display_mode *mode) const struct drm_display_mode *mode)
{ {
...@@ -786,35 +831,10 @@ static void vc5_hdmi_csc_setup(struct vc4_hdmi *vc4_hdmi, ...@@ -786,35 +831,10 @@ static void vc5_hdmi_csc_setup(struct vc4_hdmi *vc4_hdmi,
HDMI_WRITE(HDMI_VEC_INTERFACE_XBAR, 0x354021); HDMI_WRITE(HDMI_VEC_INTERFACE_XBAR, 0x354021);
if (!vc4_hdmi_is_full_range_rgb(vc4_hdmi, mode)) { if (!vc4_hdmi_is_full_range_rgb(vc4_hdmi, mode))
/* CEA VICs other than #1 requre limited range RGB vc5_hdmi_set_csc_coeffs(vc4_hdmi, vc5_hdmi_csc_full_rgb_to_limited_rgb);
* output unless overridden by an AVI infoframe. else
* Apply a colorspace conversion to squash 0-255 down vc5_hdmi_set_csc_coeffs(vc4_hdmi, vc5_hdmi_csc_full_rgb_unity);
* to 16-235. The matrix here is:
*
* [ 0.8594 0 0 16]
* [ 0 0.8594 0 16]
* [ 0 0 0.8594 16]
* [ 0 0 0 1]
* Matrix is signed 2p13 fixed point, with signed 9p6 offsets
*/
HDMI_WRITE(HDMI_CSC_12_11, (0x0000 << 16) | 0x1b80);
HDMI_WRITE(HDMI_CSC_14_13, (0x0400 << 16) | 0x0000);
HDMI_WRITE(HDMI_CSC_22_21, (0x1b80 << 16) | 0x0000);
HDMI_WRITE(HDMI_CSC_24_23, (0x0400 << 16) | 0x0000);
HDMI_WRITE(HDMI_CSC_32_31, (0x0000 << 16) | 0x0000);
HDMI_WRITE(HDMI_CSC_34_33, (0x0400 << 16) | 0x1b80);
} else {
/* Still use the matrix for full range, but make it unity.
* Matrix is signed 2p13 fixed point, with signed 9p6 offsets
*/
HDMI_WRITE(HDMI_CSC_12_11, (0x0000 << 16) | 0x2000);
HDMI_WRITE(HDMI_CSC_14_13, (0x0000 << 16) | 0x0000);
HDMI_WRITE(HDMI_CSC_22_21, (0x2000 << 16) | 0x0000);
HDMI_WRITE(HDMI_CSC_24_23, (0x0000 << 16) | 0x0000);
HDMI_WRITE(HDMI_CSC_32_31, (0x0000 << 16) | 0x0000);
HDMI_WRITE(HDMI_CSC_34_33, (0x0000 << 16) | 0x2000);
}
HDMI_WRITE(HDMI_CSC_CTL, csc_ctl); HDMI_WRITE(HDMI_CSC_CTL, csc_ctl);
......
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