drm/amd/display: Fix the delta clamping for shaper LUT

[ Upstream commit 27fc10d1095f7a7de7c917638d7134033a190dd8 ]

The shaper LUT requires a 10-bit value of the delta between segments. We
were using dc_fixpt_clamp_u0d10() to do that but it doesn't do what we
want it to do. It will preserve 10-bit precision after the decimal
point, but that's not quite what we want. We want 14-bit precision and
discard the 4 most-significant bytes.

To do that we'll do dc_fixpt_clamp_u0d14() & 0x3ff instead.

Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Reviewed-by: Krunoslav Kovac <krunoslav.kovac@amd.com>
Acked-by: Rodrigo Siqueira <rodrigo.siqueira@amd.com>
Signed-off-by: Harry Wentland <harry.wentland@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Stable-dep-of: 6f395cebdd89 ("drm/amd/display: Fix MPCC 1DLUT programming")
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/drivers/gpu/drm/amd/display/dc/dcn10/dcn10_cm_common.c b/drivers/gpu/drm/amd/display/dc/dcn10/dcn10_cm_common.c
index 7a00fe5..3538973 100644 (file)
--- a/drivers/gpu/drm/amd/display/dc/dcn10/dcn10_cm_common.c
+++ b/drivers/gpu/drm/amd/display/dc/dcn10/dcn10_cm_common.c
@@ -308,7 +308,10 @@ bool cm_helper_convert_to_custom_float(
 #define NUMBER_REGIONS     32
 #define NUMBER_SW_SEGMENTS 16
 
-bool cm_helper_translate_curve_to_hw_format(
+#define DC_LOGGER \
+               ctx->logger
+
+bool cm_helper_translate_curve_to_hw_format(struct dc_context *ctx,
                                const struct dc_transfer_func *output_tf,
                                struct pwl_params *lut_params, bool fixpoint)
 {
@@ -482,10 +485,18 @@ bool cm_helper_translate_curve_to_hw_format(
                rgb->delta_green = dc_fixpt_sub(rgb_plus_1->green, rgb->green);
                rgb->delta_blue  = dc_fixpt_sub(rgb_plus_1->blue,  rgb->blue);
 
+
                if (fixpoint == true) {
-                       rgb->delta_red_reg   = dc_fixpt_clamp_u0d10(rgb->delta_red);
-                       rgb->delta_green_reg = dc_fixpt_clamp_u0d10(rgb->delta_green);
-                       rgb->delta_blue_reg  = dc_fixpt_clamp_u0d10(rgb->delta_blue);
+                       uint32_t red_clamp = dc_fixpt_clamp_u0d14(rgb->delta_red);
+                       uint32_t green_clamp = dc_fixpt_clamp_u0d14(rgb->delta_green);
+                       uint32_t blue_clamp = dc_fixpt_clamp_u0d14(rgb->delta_blue);
+
+                       if (red_clamp >> 10 || green_clamp >> 10 || blue_clamp >> 10)
+                               DC_LOG_WARNING("Losing delta precision while programming shaper LUT.");
+
+                       rgb->delta_red_reg   = red_clamp & 0x3ff;
+                       rgb->delta_green_reg = green_clamp & 0x3ff;
+                       rgb->delta_blue_reg  = blue_clamp & 0x3ff;
                        rgb->red_reg         = dc_fixpt_clamp_u0d14(rgb->red);
                        rgb->green_reg       = dc_fixpt_clamp_u0d14(rgb->green);
                        rgb->blue_reg        = dc_fixpt_clamp_u0d14(rgb->blue);

diff --git a/drivers/gpu/drm/amd/display/dc/dcn10/dcn10_cm_common.h b/drivers/gpu/drm/amd/display/dc/dcn10/dcn10_cm_common.h
index 3b8cd74..0a68b63 100644 (file)
--- a/drivers/gpu/drm/amd/display/dc/dcn10/dcn10_cm_common.h
+++ b/drivers/gpu/drm/amd/display/dc/dcn10/dcn10_cm_common.h
@@ -106,6 +106,7 @@ bool cm_helper_convert_to_custom_float(
                bool fixpoint);
 
 bool cm_helper_translate_curve_to_hw_format(
+               struct dc_context *ctx,
                const struct dc_transfer_func *output_tf,
                struct pwl_params *lut_params, bool fixpoint);
 

diff --git a/drivers/gpu/drm/amd/display/dc/dcn10/dcn10_hw_sequencer.c b/drivers/gpu/drm/amd/display/dc/dcn10/dcn10_hw_sequencer.c
index 3940271..d84579d 100644 (file)
--- a/drivers/gpu/drm/amd/display/dc/dcn10/dcn10_hw_sequencer.c
+++ b/drivers/gpu/drm/amd/display/dc/dcn10/dcn10_hw_sequencer.c
@@ -1867,7 +1867,7 @@ bool dcn10_set_output_transfer_func(struct dc *dc, struct pipe_ctx *pipe_ctx,
        /* dcn10_translate_regamma_to_hw_format takes 750us, only do it when full
         * update.
         */
-       else if (cm_helper_translate_curve_to_hw_format(
+       else if (cm_helper_translate_curve_to_hw_format(dc->ctx,
                        stream->out_transfer_func,
                        &dpp->regamma_params, false)) {
                dpp->funcs->dpp_program_regamma_pwl(

diff --git a/drivers/gpu/drm/amd/display/dc/dcn20/dcn20_hwseq.c b/drivers/gpu/drm/amd/display/dc/dcn20/dcn20_hwseq.c
index fbc1888..9bd6a57 100644 (file)
--- a/drivers/gpu/drm/amd/display/dc/dcn20/dcn20_hwseq.c
+++ b/drivers/gpu/drm/amd/display/dc/dcn20/dcn20_hwseq.c
@@ -843,7 +843,7 @@ bool dcn20_set_output_transfer_func(struct dc *dc, struct pipe_ctx *pipe_ctx,
                        params = &stream->out_transfer_func->pwl;
                else if (pipe_ctx->stream->out_transfer_func->type ==
                        TF_TYPE_DISTRIBUTED_POINTS &&
-                       cm_helper_translate_curve_to_hw_format(
+                       cm_helper_translate_curve_to_hw_format(dc->ctx,
                        stream->out_transfer_func,
                        &mpc->blender_params, false))
                        params = &mpc->blender_params;
@@ -872,7 +872,7 @@ bool dcn20_set_blend_lut(
                if (plane_state->blend_tf->type == TF_TYPE_HWPWL)
                        blend_lut = &plane_state->blend_tf->pwl;
                else if (plane_state->blend_tf->type == TF_TYPE_DISTRIBUTED_POINTS) {
-                       cm_helper_translate_curve_to_hw_format(
+                       cm_helper_translate_curve_to_hw_format(plane_state->ctx,
                                        plane_state->blend_tf,
                                        &dpp_base->regamma_params, false);
                        blend_lut = &dpp_base->regamma_params;
@@ -894,7 +894,7 @@ bool dcn20_set_shaper_3dlut(
                if (plane_state->in_shaper_func->type == TF_TYPE_HWPWL)
                        shaper_lut = &plane_state->in_shaper_func->pwl;
                else if (plane_state->in_shaper_func->type == TF_TYPE_DISTRIBUTED_POINTS) {
-                       cm_helper_translate_curve_to_hw_format(
+                       cm_helper_translate_curve_to_hw_format(plane_state->ctx,
                                        plane_state->in_shaper_func,
                                        &dpp_base->shaper_params, true);
                        shaper_lut = &dpp_base->shaper_params;

diff --git a/drivers/gpu/drm/amd/display/dc/dcn30/dcn30_dwb_cm.c b/drivers/gpu/drm/amd/display/dc/dcn30/dcn30_dwb_cm.c
index 6a3d3a0..701c7d8 100644 (file)
--- a/drivers/gpu/drm/amd/display/dc/dcn30/dcn30_dwb_cm.c
+++ b/drivers/gpu/drm/amd/display/dc/dcn30/dcn30_dwb_cm.c
@@ -280,7 +280,7 @@ bool dwb3_ogam_set_input_transfer_func(
        dwb_ogam_lut = kzalloc(sizeof(*dwb_ogam_lut), GFP_KERNEL);
 
        if (dwb_ogam_lut) {
-               cm_helper_translate_curve_to_hw_format(
+               cm_helper_translate_curve_to_hw_format(dwbc->ctx,
                        in_transfer_func_dwb_ogam,
                        dwb_ogam_lut, false);
 

diff --git a/drivers/gpu/drm/amd/display/dc/dcn30/dcn30_hwseq.c b/drivers/gpu/drm/amd/display/dc/dcn30/dcn30_hwseq.c
index 07691b4..53262f6 100644 (file)
--- a/drivers/gpu/drm/amd/display/dc/dcn30/dcn30_hwseq.c
+++ b/drivers/gpu/drm/amd/display/dc/dcn30/dcn30_hwseq.c
@@ -107,7 +107,7 @@ static bool dcn30_set_mpc_shaper_3dlut(struct pipe_ctx *pipe_ctx,
                if (stream->func_shaper->type == TF_TYPE_HWPWL) {
                        shaper_lut = &stream->func_shaper->pwl;
                } else if (stream->func_shaper->type == TF_TYPE_DISTRIBUTED_POINTS) {
-                       cm_helper_translate_curve_to_hw_format(stream->func_shaper,
+                       cm_helper_translate_curve_to_hw_format(stream->ctx, stream->func_shaper,
                                                               &dpp_base->shaper_params, true);
                        shaper_lut = &dpp_base->shaper_params;
                }

diff --git a/drivers/gpu/drm/amd/display/dc/dcn32/dcn32_hwseq.c b/drivers/gpu/drm/amd/display/dc/dcn32/dcn32_hwseq.c
index 50b3547..f69e7d7 100644 (file)
--- a/drivers/gpu/drm/amd/display/dc/dcn32/dcn32_hwseq.c
+++ b/drivers/gpu/drm/amd/display/dc/dcn32/dcn32_hwseq.c
@@ -530,7 +530,7 @@ static bool dcn32_set_mpc_shaper_3dlut(
                if (stream->func_shaper->type == TF_TYPE_HWPWL)
                        shaper_lut = &stream->func_shaper->pwl;
                else if (stream->func_shaper->type == TF_TYPE_DISTRIBUTED_POINTS) {
-                       cm_helper_translate_curve_to_hw_format(
+                       cm_helper_translate_curve_to_hw_format(stream->ctx,
                                        stream->func_shaper,
                                        &dpp_base->shaper_params, true);
                        shaper_lut = &dpp_base->shaper_params;
@@ -566,7 +566,7 @@ bool dcn32_set_mcm_luts(
                if (plane_state->blend_tf->type == TF_TYPE_HWPWL)
                        lut_params = &plane_state->blend_tf->pwl;
                else if (plane_state->blend_tf->type == TF_TYPE_DISTRIBUTED_POINTS) {
-                       cm_helper_translate_curve_to_hw_format(
+                       cm_helper_translate_curve_to_hw_format(plane_state->ctx,
                                        plane_state->blend_tf,
                                        &dpp_base->regamma_params, false);
                        lut_params = &dpp_base->regamma_params;
@@ -581,7 +581,7 @@ bool dcn32_set_mcm_luts(
                else if (plane_state->in_shaper_func->type == TF_TYPE_DISTRIBUTED_POINTS) {
                        // TODO: dpp_base replace
                        ASSERT(false);
-                       cm_helper_translate_curve_to_hw_format(
+                       cm_helper_translate_curve_to_hw_format(plane_state->ctx,
                                        plane_state->in_shaper_func,
                                        &dpp_base->shaper_params, true);
                        lut_params = &dpp_base->shaper_params;