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drm/imx/dcss: allow using nearest neighbor interpolation scaling
This patch adds support for using NN interpolation scaling by setting the SCALING_FILTER plane property to 1. Otherwise, the default method is used. Signed-off-by: Laurentiu Palcu <laurentiu.palcu@oss.nxp.com> Reviewed-by: Lucas Stach <l.stach@pengutronix.de> Signed-off-by: Lucas Stach <l.stach@pengutronix.de> Link: https://patchwork.freedesktop.org/patch/msgid/20201105145018.27255-1-laurentiu.palcu@oss.nxp.com
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@ -7,6 +7,7 @@
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#define __DCSS_PRV_H__
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#include <drm/drm_fourcc.h>
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#include <drm/drm_plane.h>
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#include <linux/io.h>
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#include <video/videomode.h>
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@ -165,6 +166,8 @@ void dcss_ss_sync_set(struct dcss_ss *ss, struct videomode *vm,
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/* SCALER */
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int dcss_scaler_init(struct dcss_dev *dcss, unsigned long scaler_base);
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void dcss_scaler_exit(struct dcss_scaler *scl);
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void dcss_scaler_set_filter(struct dcss_scaler *scl, int ch_num,
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enum drm_scaling_filter scaling_filter);
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void dcss_scaler_setup(struct dcss_scaler *scl, int ch_num,
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const struct drm_format_info *format,
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int src_xres, int src_yres, int dst_xres, int dst_yres,
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@ -257,7 +257,8 @@ static bool dcss_plane_needs_setup(struct drm_plane_state *state,
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state->src_h != old_state->src_h ||
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fb->format->format != old_fb->format->format ||
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fb->modifier != old_fb->modifier ||
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state->rotation != old_state->rotation;
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state->rotation != old_state->rotation ||
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state->scaling_filter != old_state->scaling_filter;
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}
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static void dcss_plane_atomic_update(struct drm_plane *plane,
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@ -313,6 +314,9 @@ static void dcss_plane_atomic_update(struct drm_plane *plane,
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is_rotation_90_or_270 = state->rotation & (DRM_MODE_ROTATE_90 |
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DRM_MODE_ROTATE_270);
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dcss_scaler_set_filter(dcss->scaler, dcss_plane->ch_num,
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state->scaling_filter);
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dcss_scaler_setup(dcss->scaler, dcss_plane->ch_num,
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state->fb->format,
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is_rotation_90_or_270 ? src_h : src_w,
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@ -394,6 +398,10 @@ struct dcss_plane *dcss_plane_init(struct drm_device *drm,
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if (ret)
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return ERR_PTR(ret);
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drm_plane_create_scaling_filter_property(&dcss_plane->base,
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BIT(DRM_SCALING_FILTER_DEFAULT) |
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BIT(DRM_SCALING_FILTER_NEAREST_NEIGHBOR));
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drm_plane_create_rotation_property(&dcss_plane->base,
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DRM_MODE_ROTATE_0,
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DRM_MODE_ROTATE_0 |
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@ -77,6 +77,8 @@ struct dcss_scaler_ch {
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u32 c_vstart;
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u32 c_hstart;
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bool use_nn_interpolation;
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};
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struct dcss_scaler {
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@ -243,6 +245,17 @@ static void dcss_scaler_gaussian_filter(int fc_q, bool use_5_taps,
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}
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}
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static void dcss_scaler_nearest_neighbor_filter(bool use_5_taps,
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int coef[][PSC_NUM_TAPS])
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{
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int i, j;
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for (i = 0; i < PSC_STORED_PHASES; i++)
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for (j = 0; j < PSC_NUM_TAPS; j++)
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coef[i][j] = j == PSC_NUM_TAPS >> 1 ?
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(1 << PSC_COEFF_PRECISION) : 0;
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}
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/**
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* dcss_scaler_filter_design() - Compute filter coefficients using
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* Gaussian filter.
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@ -253,7 +266,8 @@ static void dcss_scaler_gaussian_filter(int fc_q, bool use_5_taps,
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*/
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static void dcss_scaler_filter_design(int src_length, int dst_length,
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bool use_5_taps, bool phase0_identity,
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int coef[][PSC_NUM_TAPS])
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int coef[][PSC_NUM_TAPS],
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bool nn_interpolation)
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{
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int fc_q;
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@ -263,8 +277,11 @@ static void dcss_scaler_filter_design(int src_length, int dst_length,
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else
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fc_q = div_q(dst_length, src_length * PSC_NUM_PHASES);
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/* compute gaussian filter coefficients */
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dcss_scaler_gaussian_filter(fc_q, use_5_taps, phase0_identity, coef);
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if (nn_interpolation)
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dcss_scaler_nearest_neighbor_filter(use_5_taps, coef);
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else
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/* compute gaussian filter coefficients */
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dcss_scaler_gaussian_filter(fc_q, use_5_taps, phase0_identity, coef);
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}
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static void dcss_scaler_write(struct dcss_scaler_ch *ch, u32 val, u32 ofs)
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@ -653,12 +670,14 @@ static void dcss_scaler_yuv_coef_set(struct dcss_scaler_ch *ch,
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/* horizontal luma */
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dcss_scaler_filter_design(src_xres, dst_xres, false,
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src_xres == dst_xres, coef);
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src_xres == dst_xres, coef,
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ch->use_nn_interpolation);
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dcss_scaler_program_7_coef_set(ch, DCSS_SCALER_COEF_HLUM, coef);
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/* vertical luma */
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dcss_scaler_filter_design(src_yres, dst_yres, program_5_taps,
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src_yres == dst_yres, coef);
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src_yres == dst_yres, coef,
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ch->use_nn_interpolation);
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if (program_5_taps)
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dcss_scaler_program_5_coef_set(ch, DCSS_SCALER_COEF_VLUM, coef);
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@ -678,14 +697,14 @@ static void dcss_scaler_yuv_coef_set(struct dcss_scaler_ch *ch,
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/* horizontal chroma */
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dcss_scaler_filter_design(src_xres, dst_xres, false,
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(src_xres == dst_xres) && (ch->c_hstart == 0),
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coef);
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coef, ch->use_nn_interpolation);
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dcss_scaler_program_7_coef_set(ch, DCSS_SCALER_COEF_HCHR, coef);
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/* vertical chroma */
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dcss_scaler_filter_design(src_yres, dst_yres, program_5_taps,
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(src_yres == dst_yres) && (ch->c_vstart == 0),
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coef);
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coef, ch->use_nn_interpolation);
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if (program_5_taps)
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dcss_scaler_program_5_coef_set(ch, DCSS_SCALER_COEF_VCHR, coef);
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else
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@ -700,12 +719,14 @@ static void dcss_scaler_rgb_coef_set(struct dcss_scaler_ch *ch,
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/* horizontal RGB */
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dcss_scaler_filter_design(src_xres, dst_xres, false,
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src_xres == dst_xres, coef);
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src_xres == dst_xres, coef,
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ch->use_nn_interpolation);
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dcss_scaler_program_7_coef_set(ch, DCSS_SCALER_COEF_HLUM, coef);
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/* vertical RGB */
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dcss_scaler_filter_design(src_yres, dst_yres, false,
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src_yres == dst_yres, coef);
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src_yres == dst_yres, coef,
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ch->use_nn_interpolation);
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dcss_scaler_program_7_coef_set(ch, DCSS_SCALER_COEF_VLUM, coef);
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}
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@ -751,6 +772,14 @@ static void dcss_scaler_set_rgb10_order(struct dcss_scaler_ch *ch,
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ch->sdata_ctrl |= a2r10g10b10_format << A2R10G10B10_FORMAT_POS;
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}
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void dcss_scaler_set_filter(struct dcss_scaler *scl, int ch_num,
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enum drm_scaling_filter scaling_filter)
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{
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struct dcss_scaler_ch *ch = &scl->ch[ch_num];
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ch->use_nn_interpolation = scaling_filter == DRM_SCALING_FILTER_NEAREST_NEIGHBOR;
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}
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void dcss_scaler_setup(struct dcss_scaler *scl, int ch_num,
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const struct drm_format_info *format,
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int src_xres, int src_yres, int dst_xres, int dst_yres,
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