diff options
Diffstat (limited to 'drivers/gpu/drm/imx/dcss/dcss-scaler.c')
-rw-r--r-- | drivers/gpu/drm/imx/dcss/dcss-scaler.c | 47 |
1 files changed, 38 insertions, 9 deletions
diff --git a/drivers/gpu/drm/imx/dcss/dcss-scaler.c b/drivers/gpu/drm/imx/dcss/dcss-scaler.c index cd21905de580..47852b9dd5ea 100644 --- a/drivers/gpu/drm/imx/dcss/dcss-scaler.c +++ b/drivers/gpu/drm/imx/dcss/dcss-scaler.c @@ -77,6 +77,8 @@ struct dcss_scaler_ch { u32 c_vstart; u32 c_hstart; + + bool use_nn_interpolation; }; struct dcss_scaler { @@ -243,6 +245,17 @@ static void dcss_scaler_gaussian_filter(int fc_q, bool use_5_taps, } } +static void dcss_scaler_nearest_neighbor_filter(bool use_5_taps, + int coef[][PSC_NUM_TAPS]) +{ + int i, j; + + for (i = 0; i < PSC_STORED_PHASES; i++) + for (j = 0; j < PSC_NUM_TAPS; j++) + coef[i][j] = j == PSC_NUM_TAPS >> 1 ? + (1 << PSC_COEFF_PRECISION) : 0; +} + /** * dcss_scaler_filter_design() - Compute filter coefficients using * Gaussian filter. @@ -253,7 +266,8 @@ static void dcss_scaler_gaussian_filter(int fc_q, bool use_5_taps, */ static void dcss_scaler_filter_design(int src_length, int dst_length, bool use_5_taps, bool phase0_identity, - int coef[][PSC_NUM_TAPS]) + int coef[][PSC_NUM_TAPS], + bool nn_interpolation) { int fc_q; @@ -263,8 +277,11 @@ static void dcss_scaler_filter_design(int src_length, int dst_length, else fc_q = div_q(dst_length, src_length * PSC_NUM_PHASES); - /* compute gaussian filter coefficients */ - dcss_scaler_gaussian_filter(fc_q, use_5_taps, phase0_identity, coef); + if (nn_interpolation) + dcss_scaler_nearest_neighbor_filter(use_5_taps, coef); + else + /* compute gaussian filter coefficients */ + dcss_scaler_gaussian_filter(fc_q, use_5_taps, phase0_identity, coef); } static void dcss_scaler_write(struct dcss_scaler_ch *ch, u32 val, u32 ofs) @@ -653,12 +670,14 @@ static void dcss_scaler_yuv_coef_set(struct dcss_scaler_ch *ch, /* horizontal luma */ dcss_scaler_filter_design(src_xres, dst_xres, false, - src_xres == dst_xres, coef); + src_xres == dst_xres, coef, + ch->use_nn_interpolation); dcss_scaler_program_7_coef_set(ch, DCSS_SCALER_COEF_HLUM, coef); /* vertical luma */ dcss_scaler_filter_design(src_yres, dst_yres, program_5_taps, - src_yres == dst_yres, coef); + src_yres == dst_yres, coef, + ch->use_nn_interpolation); if (program_5_taps) dcss_scaler_program_5_coef_set(ch, DCSS_SCALER_COEF_VLUM, coef); @@ -678,14 +697,14 @@ static void dcss_scaler_yuv_coef_set(struct dcss_scaler_ch *ch, /* horizontal chroma */ dcss_scaler_filter_design(src_xres, dst_xres, false, (src_xres == dst_xres) && (ch->c_hstart == 0), - coef); + coef, ch->use_nn_interpolation); dcss_scaler_program_7_coef_set(ch, DCSS_SCALER_COEF_HCHR, coef); /* vertical chroma */ dcss_scaler_filter_design(src_yres, dst_yres, program_5_taps, (src_yres == dst_yres) && (ch->c_vstart == 0), - coef); + coef, ch->use_nn_interpolation); if (program_5_taps) dcss_scaler_program_5_coef_set(ch, DCSS_SCALER_COEF_VCHR, coef); else @@ -700,12 +719,14 @@ static void dcss_scaler_rgb_coef_set(struct dcss_scaler_ch *ch, /* horizontal RGB */ dcss_scaler_filter_design(src_xres, dst_xres, false, - src_xres == dst_xres, coef); + src_xres == dst_xres, coef, + ch->use_nn_interpolation); dcss_scaler_program_7_coef_set(ch, DCSS_SCALER_COEF_HLUM, coef); /* vertical RGB */ dcss_scaler_filter_design(src_yres, dst_yres, false, - src_yres == dst_yres, coef); + src_yres == dst_yres, coef, + ch->use_nn_interpolation); dcss_scaler_program_7_coef_set(ch, DCSS_SCALER_COEF_VLUM, coef); } @@ -751,6 +772,14 @@ static void dcss_scaler_set_rgb10_order(struct dcss_scaler_ch *ch, ch->sdata_ctrl |= a2r10g10b10_format << A2R10G10B10_FORMAT_POS; } +void dcss_scaler_set_filter(struct dcss_scaler *scl, int ch_num, + enum drm_scaling_filter scaling_filter) +{ + struct dcss_scaler_ch *ch = &scl->ch[ch_num]; + + ch->use_nn_interpolation = scaling_filter == DRM_SCALING_FILTER_NEAREST_NEIGHBOR; +} + void dcss_scaler_setup(struct dcss_scaler *scl, int ch_num, const struct drm_format_info *format, int src_xres, int src_yres, int dst_xres, int dst_yres, |