On Thu, Nov 01, 2018 at 01:49:01PM +0530, Uma Shankar wrote:
> Plane input CSC needs to be enabled to convert frambuffers from
> YUV to RGB. This is needed for bottom 3 planes on ICL, rest of
> the planes have hardcoded conversion and taken care by the legacy
> code.
>
> This patch defines the co-efficient values for YUV to RGB conversion
> in BT709 and BT601 formats. It programs the coefficients and enables
> the plane input csc unit in hardware.
>
> This has been verified and tested by Maarten and the change is working
> as expecpted.
>
> v2: Addressed Maarten's and Ville's review comments and added the
> coefficients in a 2D array instead of independent Macros.
>
> v3: Added individual coefficient matrix (9 values) instead of 6
> register values as per Maarten's comment. Also addresed a shift
> issue with B channel coefficient.
>
> v4: Added support for Limited Range Color Handling
>
> v5: Fixed Matt and Maarten's review comments.
>
> v6: Added human readable matrix values for YUV to RGB Conversion along
> with just the bspec register values, as per Matt's suggestion.
>
> v7: Refactored the code, move csc coefficient programming function to
> intel_sprite.c and made it static as per Ville's review comment.
>
> Signed-off-by: Uma Shankar <uma.shan...@intel.com>
> Reviewed-by: Matt Roper <matthew.d.ro...@intel.com>
> Reviewed-by: Maarten Lankhorst <maarten.lankho...@linux.intel.com>
>
> ---
> drivers/gpu/drm/i915/intel_display.c | 17 +++++--
> drivers/gpu/drm/i915/intel_sprite.c | 99
> ++++++++++++++++++++++++++++++++++++
> include/drm/drm_color_mgmt.h | 9 ++++
> 3 files changed, 120 insertions(+), 5 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/intel_display.c
> b/drivers/gpu/drm/i915/intel_display.c
> index fe045ab..daec1fd 100644
> --- a/drivers/gpu/drm/i915/intel_display.c
> +++ b/drivers/gpu/drm/i915/intel_display.c
> @@ -3666,6 +3666,7 @@ u32 glk_plane_color_ctl(const struct intel_crtc_state
> *crtc_state,
> struct drm_i915_private *dev_priv =
> to_i915(plane_state->base.plane->dev);
> const struct drm_framebuffer *fb = plane_state->base.fb;
> + struct intel_plane *plane = to_intel_plane(plane_state->base.plane);
> u32 plane_color_ctl = 0;
>
> if (INTEL_GEN(dev_priv) < 11) {
> @@ -3675,14 +3676,20 @@ u32 glk_plane_color_ctl(const struct intel_crtc_state
> *crtc_state,
> plane_color_ctl |= PLANE_COLOR_PLANE_GAMMA_DISABLE;
> plane_color_ctl |= glk_plane_color_ctl_alpha(plane_state);
>
> - if (fb->format->is_yuv) {
> - if (plane_state->base.color_encoding == DRM_COLOR_YCBCR_BT709)
> - plane_color_ctl |=
> PLANE_COLOR_CSC_MODE_YUV709_TO_RGB709;
> + if (fb->format->is_yuv && !icl_is_hdr_plane(plane)) {
> + if (plane_state->base.color_encoding ==
> + DRM_COLOR_YCBCR_BT709)
> + plane_color_ctl |=
> + PLANE_COLOR_CSC_MODE_YUV709_TO_RGB709;
> else
> - plane_color_ctl |=
> PLANE_COLOR_CSC_MODE_YUV601_TO_RGB709;
> + plane_color_ctl |=
> + PLANE_COLOR_CSC_MODE_YUV601_TO_RGB709;
>
> if (plane_state->base.color_range == DRM_COLOR_YCBCR_FULL_RANGE)
> - plane_color_ctl |=
> PLANE_COLOR_YUV_RANGE_CORRECTION_DISABLE;
> + plane_color_ctl |=
> + PLANE_COLOR_YUV_RANGE_CORRECTION_DISABLE;
> + } else if (fb->format->is_yuv) {
> + plane_color_ctl |= PLANE_COLOR_INPUT_CSC_ENABLE;
> }
>
> return plane_color_ctl;
> diff --git a/drivers/gpu/drm/i915/intel_sprite.c
> b/drivers/gpu/drm/i915/intel_sprite.c
> index c604f6b..711502455 100644
> --- a/drivers/gpu/drm/i915/intel_sprite.c
> +++ b/drivers/gpu/drm/i915/intel_sprite.c
> @@ -40,6 +40,7 @@
> #include "intel_frontbuffer.h"
> #include <drm/i915_drm.h>
> #include "i915_drv.h"
> +#include <drm/drm_color_mgmt.h>
>
> int intel_usecs_to_scanlines(const struct drm_display_mode *adjusted_mode,
> int usecs)
> @@ -458,11 +459,106 @@ int intel_plane_check_src_coordinates(struct
> intel_plane_state *plane_state)
> spin_unlock_irqrestore(&dev_priv->uncore.lock, irqflags);
> }
>
> +static void
> +icl_program_input_csc_coeff(const struct intel_crtc_state *crtc_state,
> + const struct intel_plane_state *plane_state)
> +{
> + struct drm_i915_private *dev_priv =
> + to_i915(plane_state->base.plane->dev);
> + struct intel_crtc *crtc = to_intel_crtc(crtc_state->base.crtc);
> + enum pipe pipe = crtc->pipe;
> + struct intel_plane *intel_plane =
> + to_intel_plane(plane_state->base.plane);
> + enum plane_id plane = intel_plane->id;
> +
> + static const u16 input_csc_matrix[][9] = {
> + /*
> + * BT.601 full range YCbCr -> full range RGB
> + * The matrix required is :
> + * [1.000, 0.000, 1.371,
> + * 1.000, -0.336, -0.698,
> + * 1.000, 1.732, 0.0000]
> + */
> + [DRM_COLOR_YCBCR_BT601] = {
> + 0x7AF8, 0x7800, 0x0,
> + 0x8B28, 0x7800, 0x9AC0,
> + 0x0, 0x7800, 0x7DD8,
> + },
> + /*
> + * BT.709 full range YCbCr -> full range RGB
> + * The matrix required is :
> + * [1.000, 0.000, 1.574,
> + * 1.000, -0.187, -0.468,
> + * 1.000, 1.855, 0.0000]
> + */
> + [DRM_COLOR_YCBCR_BT709] = {
> + 0x7C98, 0x7800, 0x0,
> + 0x9EF8, 0x7800, 0xABF8,
> + 0x0, 0x7800, 0x7ED8,
> + },
> + };
> +
> + /* Matrix for Limited Range to Full Range Conversion */
> + static const u16 input_csc_matrix_lr[][9] = {
> + /*
> + * BT.601 Limted range YCbCr -> full range RGB
> + * The matrix required is :
> + * [1.164384, 0.000, 1.596370,
> + * 1.138393, -0.382500, -0.794598,
> + * 1.138393, 1.971696, 0.0000]
> + */
> + [DRM_COLOR_YCBCR_BT601] = {
> + 0x7CC8, 0x7950, 0x0,
> + 0x8CB8, 0x7918, 0x9C40,
> + 0x0, 0x7918, 0x7FC8,
> + },
> + /*
> + * BT.709 Limited range YCbCr -> full range RGB
> + * The matrix required is :
> + * [1.164, 0.000, 1.833671,
> + * 1.138393, -0.213249, -0.532909,
> + * 1.138393, 2.112402, 0.0000]
> + */
> + [DRM_COLOR_YCBCR_BT709] = {
> + 0x7EA8, 0x7950, 0x0,
> + 0x8888, 0x7918, 0xADA8,
> + 0x0, 0x7918, 0x6870,
> + },
> + };
> + const u16 *csc;
> +
> + if (plane_state->base.color_range == DRM_COLOR_YCBCR_FULL_RANGE)
> + csc = input_csc_matrix[plane_state->base.color_encoding];
> + else
> + csc = input_csc_matrix_lr[plane_state->base.color_encoding];
> +
> + I915_WRITE(PLANE_INPUT_CSC_COEFF(pipe, plane, 0), ROFF(csc[0]) |
> + GOFF(csc[1]));
> + I915_WRITE(PLANE_INPUT_CSC_COEFF(pipe, plane, 1), BOFF(csc[2]));
> + I915_WRITE(PLANE_INPUT_CSC_COEFF(pipe, plane, 2), ROFF(csc[3]) |
> + GOFF(csc[4]));
> + I915_WRITE(PLANE_INPUT_CSC_COEFF(pipe, plane, 3), BOFF(csc[5]));
> + I915_WRITE(PLANE_INPUT_CSC_COEFF(pipe, plane, 4), ROFF(csc[6]) |
> + GOFF(csc[7]));
> + I915_WRITE(PLANE_INPUT_CSC_COEFF(pipe, plane, 5), BOFF(csc[8]));
> +
> + I915_WRITE(PLANE_INPUT_CSC_PREOFF(pipe, plane, 0),
> + PREOFF_YUV_TO_RGB_HI);
> + I915_WRITE(PLANE_INPUT_CSC_PREOFF(pipe, plane, 1),
> + PREOFF_YUV_TO_RGB_ME);
> + I915_WRITE(PLANE_INPUT_CSC_PREOFF(pipe, plane, 2),
> + PREOFF_YUV_TO_RGB_LO);
> + I915_WRITE(PLANE_INPUT_CSC_POSTOFF(pipe, plane, 0), 0x0);
> + I915_WRITE(PLANE_INPUT_CSC_POSTOFF(pipe, plane, 1), 0x0);
> + I915_WRITE(PLANE_INPUT_CSC_POSTOFF(pipe, plane, 2), 0x0);
> +}
> +
> void
> skl_update_plane(struct intel_plane *plane,
> const struct intel_crtc_state *crtc_state,
> const struct intel_plane_state *plane_state)
> {
> + const struct drm_framebuffer *fb = plane_state->base.fb;
> int color_plane = 0;
>
> if (plane_state->linked_plane) {
> @@ -470,6 +566,9 @@ int intel_plane_check_src_coordinates(struct
> intel_plane_state *plane_state)
> color_plane = 1;
> }
>
> + if (fb->format->is_yuv && icl_is_hdr_plane(plane))
> + icl_program_input_csc_coeff(crtc_state, plane_state);
> +
> skl_program_plane(plane, crtc_state, plane_state,
> color_plane, false, plane_state->ctl);
> }
> diff --git a/include/drm/drm_color_mgmt.h b/include/drm/drm_color_mgmt.h
> index 90ef999..3e17381 100644
> --- a/include/drm/drm_color_mgmt.h
> +++ b/include/drm/drm_color_mgmt.h
> @@ -29,6 +29,15 @@
> struct drm_crtc;
> struct drm_plane;
>
> +/* Preoffset values for YUV to RGB Conversion */
> +#define PREOFF_YUV_TO_RGB_HI 0x1800
> +#define PREOFF_YUV_TO_RGB_ME 0x1F00
> +#define PREOFF_YUV_TO_RGB_LO 0x1800
Why are these here when all the other numbers are in
icl_program_input_csc_coeff()? I'd rather just put
everything into icl_program_input_csc_coeff().
> +
> +#define ROFF(x) (((x) & 0xffff) << 16)
> +#define GOFF(x) (((x) & 0xffff) << 0)
> +#define BOFF(x) (((x) & 0xffff) << 16)
> +
> uint32_t drm_color_lut_extract(uint32_t user_input, uint32_t bit_precision);
>
> void drm_crtc_enable_color_mgmt(struct drm_crtc *crtc,
> --
> 1.9.1
>
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> Intel-gfx@lists.freedesktop.org
> https://lists.freedesktop.org/mailman/listinfo/intel-gfx
--
Ville Syrjälä
Intel
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