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SubjectRe: [PATCH v2 2/4] drm/komeda: Introduce komeda_color_manager/state
Date
Hi James,

On Tuesday, 13 August 2019 05:56:07 BST james qian wang (Arm Technology China) wrote:
> Many komeda component support color management like layer and IPS, so
> komeda_color_manager/state are introduced to manager gamma, csc and degamma
> together for easily share it to multiple componpent.
>
> And for komeda_color_manager which:
> - convert drm 3d gamma lut to komeda specific gamma coeffs
> - gamma table management and hide the HW difference for komeda-CORE
>
> Signed-off-by: James Qian Wang (Arm Technology China) <james.qian.wang@arm.com>
> ---
> .../arm/display/komeda/komeda_color_mgmt.c | 126 ++++++++++++++++++
> .../arm/display/komeda/komeda_color_mgmt.h | 32 ++++-
> 2 files changed, 156 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/gpu/drm/arm/display/komeda/komeda_color_mgmt.c b/drivers/gpu/drm/arm/display/komeda/komeda_color_mgmt.c
> index 9d14a92dbb17..bf2388d641b9 100644
> --- a/drivers/gpu/drm/arm/display/komeda/komeda_color_mgmt.c
> +++ b/drivers/gpu/drm/arm/display/komeda/komeda_color_mgmt.c
> @@ -4,7 +4,9 @@
> * Author: James.Qian.Wang <james.qian.wang@arm.com>
> *
> */
> +#include <drm/drm_print.h>
>
> +#include "malidp_utils.h"
> #include "komeda_color_mgmt.h"
>
> /* 10bit precision YUV2RGB matrix */
> @@ -65,3 +67,127 @@ const s32 *komeda_select_yuv2rgb_coeffs(u32 color_encoding, u32 color_range)
>
> return coeffs;
> }
> +
> +struct gamma_curve_sector {
> + u32 boundary_start;
> + u32 num_of_segments;
> + u32 segment_width;
> +};
> +
> +struct gamma_curve_segment {
> + u32 start;
> + u32 end;
> +};
> +
> +static struct gamma_curve_sector sector_tbl[] = {
> + { 0, 4, 4 },
> + { 16, 4, 4 },
> + { 32, 4, 8 },
> + { 64, 4, 16 },
> + { 128, 4, 32 },
> + { 256, 4, 64 },
> + { 512, 16, 32 },
> + { 1024, 24, 128 },
> +};
> +
> +static struct gamma_curve_sector igamma_sector_tbl[] = {
> + {0, 64, 64},
> +};
> +
> +static void
> +drm_lut_to_coeffs(struct drm_property_blob *lut_blob, u32 *coeffs,
> + struct gamma_curve_sector *sector_tbl, u32 num_sectors)
> +{
> + struct drm_color_lut *lut;
> + u32 i, j, in, num = 0;
> +
> + if (!lut_blob)
> + return;
> +
> + lut = lut_blob->data;
> +
> + for (i = 0; i < num_sectors; i++) {
> + for (j = 0; j < sector_tbl[i].num_of_segments; j++) {
> + in = sector_tbl[i].boundary_start +
> + j * sector_tbl[i].segment_width;
> +
> + coeffs[num++] = drm_color_lut_extract(lut[in].red,
> + KOMEDA_COLOR_PRECISION);
> + }
> + }
> +
> + coeffs[num] = BIT(KOMEDA_COLOR_PRECISION);
> +}
> +
> +void drm_lut_to_igamma_coeffs(struct drm_property_blob *lut_blob, u32 *coeffs)
> +{
> + drm_lut_to_coeffs(lut_blob, coeffs,
> + igamma_sector_tbl, ARRAY_SIZE(igamma_sector_tbl));
> +}
> +
> +void drm_lut_to_fgamma_coeffs(struct drm_property_blob *lut_blob, u32 *coeffs)
> +{
> + drm_lut_to_coeffs(lut_blob, coeffs,
> + sector_tbl, ARRAY_SIZE(sector_tbl));
> +}
> +
> +void drm_ctm_to_coeffs(struct drm_property_blob *ctm_blob, u32 *coeffs)
> +{
> + struct drm_color_ctm *ctm;
> + u32 i;
> +
> + if (!ctm_blob)
> + return;
> +
> + ctm = ctm_blob->data;
> +
> + for (i = 0; i < KOMEDA_N_CTM_COEFFS; ++i) {
> + /* Convert from S31.32 to Q3.12. */
> + s64 v = ctm->matrix[i];
> +
> + coeffs[i] = clamp_val(v, 1 - (1LL << 34), (1LL << 34) - 1) >> 20;
CTM matrix values are S31.32, i.e. sign-magnitude, so clamp_val won't
give you the right result for negative coeffs. See
malidp_crtc_atomic_check_ctm for the sign-mag -> 2's complement
conversion.
> + }
> +}
> +
> +void komeda_color_duplicate_state(struct komeda_color_state *new,
> + struct komeda_color_state *old)
[bikeshed] not really a _duplicate_state if all it does is refcounts.
kmemdup here and return a pointer (with ERR_PTR on fail), or memcpy if
you want to keep the signature?
> +{
> + new->igamma = komeda_coeffs_get(old->igamma);
> + new->fgamma = komeda_coeffs_get(old->fgamma);
> +}
> +
> +void komeda_color_cleanup_state(struct komeda_color_state *color_st)
> +{
> + komeda_coeffs_put(color_st->igamma);
> + komeda_coeffs_put(color_st->fgamma);
> +}
> +
> +int komeda_color_validate(struct komeda_color_manager *mgr,
> + struct komeda_color_state *st,
> + struct drm_property_blob *igamma_blob,
> + struct drm_property_blob *fgamma_blob)
> +{
> + u32 coeffs[KOMEDA_N_GAMMA_COEFFS];
> +
> + komeda_color_cleanup_state(st);
> +
> + if (igamma_blob) {
> + drm_lut_to_igamma_coeffs(igamma_blob, coeffs);
> + st->igamma = komeda_coeffs_request(mgr->igamma_mgr, coeffs);
> + if (!st->igamma) {
> + DRM_DEBUG_ATOMIC("request igamma table failed.\n");
> + return -EBUSY;
> + }
> + }
> +
> + if (fgamma_blob) {
> + drm_lut_to_fgamma_coeffs(fgamma_blob, coeffs);
> + st->fgamma = komeda_coeffs_request(mgr->fgamma_mgr, coeffs);
> + if (!st->fgamma) {
> + DRM_DEBUG_ATOMIC("request fgamma table failed.\n");
> + return -EBUSY;
> + }
> + }
> +
> + return 0;
> +}
> diff --git a/drivers/gpu/drm/arm/display/komeda/komeda_color_mgmt.h b/drivers/gpu/drm/arm/display/komeda/komeda_color_mgmt.h
> index a2df218f58e7..41a96b3b540f 100644
> --- a/drivers/gpu/drm/arm/display/komeda/komeda_color_mgmt.h
> +++ b/drivers/gpu/drm/arm/display/komeda/komeda_color_mgmt.h
> @@ -4,14 +4,42 @@
> * Author: James.Qian.Wang <james.qian.wang@arm.com>
> *
> */
> -
> #ifndef _KOMEDA_COLOR_MGMT_H_
> #define _KOMEDA_COLOR_MGMT_H_
>
> #include <drm/drm_color_mgmt.h>
> +#include "komeda_coeffs.h"
>
> #define KOMEDA_N_YUV2RGB_COEFFS 12
> +#define KOMEDA_N_RGB2YUV_COEFFS 12
> +#define KOMEDA_COLOR_PRECISION 12
> +#define KOMEDA_N_GAMMA_COEFFS 65
> +#define KOMEDA_COLOR_LUT_SIZE BIT(KOMEDA_COLOR_PRECISION)
I don't see how the number of LUT entries has anything to do with the
bit-precision of each entry.
> +#define KOMEDA_N_CTM_COEFFS 9
> +
> +struct komeda_color_manager {
> + struct komeda_coeffs_manager *igamma_mgr;
> + struct komeda_coeffs_manager *fgamma_mgr;
> + bool has_ctm;
> +};
> +
> +struct komeda_color_state {
> + struct komeda_coeffs_table *igamma;
> + struct komeda_coeffs_table *fgamma;
> +};
> +
> +void komeda_color_duplicate_state(struct komeda_color_state *new,
> + struct komeda_color_state *old);
> +void komeda_color_cleanup_state(struct komeda_color_state *color_st);
> +int komeda_color_validate(struct komeda_color_manager *mgr,
> + struct komeda_color_state *st,
> + struct drm_property_blob *igamma_blob,
> + struct drm_property_blob *fgamma_blob);
> +
> +void drm_lut_to_igamma_coeffs(struct drm_property_blob *lut_blob, u32 *coeffs);
> +void drm_lut_to_fgamma_coeffs(struct drm_property_blob *lut_blob, u32 *coeffs);
> +void drm_ctm_to_coeffs(struct drm_property_blob *ctm_blob, u32 *coeffs);
>
> const s32 *komeda_select_yuv2rgb_coeffs(u32 color_encoding, u32 color_range);
>
> -#endif
> +#endif /*_KOMEDA_COLOR_MGMT_H_*/
>

BR,
Mihail



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