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.
Signed-off-by: Maxime Ripard <maxime@xxxxxxxxxx>
---
drivers/gpu/drm/vc4/vc4_hdmi.c | 77 +++++++++++++++++++++-------------
1 file changed, 48 insertions(+), 29 deletions(-)
diff --git a/drivers/gpu/drm/vc4/vc4_hdmi.c b/drivers/gpu/drm/vc4/vc4_hdmi.c
index b0e0cb533944..9614de7303b8 100644
--- a/drivers/gpu/drm/vc4/vc4_hdmi.c
+++ b/drivers/gpu/drm/vc4/vc4_hdmi.c
@@ -525,6 +525,50 @@ static void vc4_hdmi_csc_setup(struct vc4_hdmi *vc4_hdmi,
HDMI_WRITE(HDMI_CSC_CTL, csc_ctl);
}
+
+/*
+ * 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])
+{
+ 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,
const struct drm_display_mode *mode)
{
@@ -533,35 +577,10 @@ static void vc5_hdmi_csc_setup(struct vc4_hdmi *vc4_hdmi,
HDMI_WRITE(HDMI_VEC_INTERFACE_XBAR, 0x354021);
- if (vc4_hdmi_is_full_range_rgb(vc4_hdmi, mode)) {
- /* CEA VICs other than #1 requre 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]
- * [ 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);
- }
+ if (vc4_hdmi_is_full_range_rgb(vc4_hdmi, mode))
+ vc5_hdmi_set_csc_coeffs(vc4_hdmi, &vc5_hdmi_csc_full_rgb_unity);
+ else
+ vc5_hdmi_set_csc_coeffs(vc4_hdmi, &vc5_hdmi_csc_full_rgb_to_limited_rgb);
HDMI_WRITE(HDMI_CSC_CTL, csc_ctl);
}
--
2.30.2
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