1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * Support for Intel Camera Imaging ISP subsystem.
4 * Copyright (c) 2015, Intel Corporation.
5 *
6 * This program is free software; you can redistribute it and/or modify it
7 * under the terms and conditions of the GNU General Public License,
8 * version 2, as published by the Free Software Foundation.
9 *
10 * This program is distributed in the hope it will be useful, but WITHOUT
11 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
12 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
13 * more details.
14 */
15
16 #include "atomisp_internal.h"
17
18 #include "ia_css_vf.host.h"
19 #include <assert_support.h>
20 #include <ia_css_err.h>
21 #include <ia_css_frame.h>
22 #include <ia_css_frame_public.h>
23 #include <ia_css_pipeline.h>
24 #define IA_CSS_INCLUDE_CONFIGURATIONS
25 #include "ia_css_isp_configs.h"
26
27 #include "isp.h"
28
29 void
ia_css_vf_config(struct sh_css_isp_vf_isp_config * to,const struct ia_css_vf_configuration * from,unsigned int size)30 ia_css_vf_config(
31 struct sh_css_isp_vf_isp_config *to,
32 const struct ia_css_vf_configuration *from,
33 unsigned int size)
34 {
35 unsigned int elems_a = ISP_VEC_NELEMS;
36
37 (void)size;
38 to->vf_downscale_bits = from->vf_downscale_bits;
39 to->enable = from->info != NULL;
40
41 if (from->info) {
42 ia_css_frame_info_to_frame_sp_info(&to->info, from->info);
43 ia_css_dma_configure_from_info(&to->dma.port_b, from->info);
44 to->dma.width_a_over_b = elems_a / to->dma.port_b.elems;
45
46 /* Assume divisiblity here, may need to generalize to fixed point. */
47 assert(elems_a % to->dma.port_b.elems == 0);
48 }
49 }
50
51 /* compute the log2 of the downscale factor needed to get closest
52 * to the requested viewfinder resolution on the upper side. The output cannot
53 * be smaller than the requested viewfinder resolution.
54 */
55 int
sh_css_vf_downscale_log2(const struct ia_css_frame_info * out_info,const struct ia_css_frame_info * vf_info,unsigned int * downscale_log2)56 sh_css_vf_downscale_log2(
57 const struct ia_css_frame_info *out_info,
58 const struct ia_css_frame_info *vf_info,
59 unsigned int *downscale_log2) {
60 unsigned int ds_log2 = 0;
61 unsigned int out_width;
62
63 if ((!out_info) || (!vf_info))
64 return -EINVAL;
65
66 out_width = out_info->res.width;
67
68 if (out_width == 0)
69 return -EINVAL;
70
71 /* downscale until width smaller than the viewfinder width. We don't
72 * test for the height since the vmem buffers only put restrictions on
73 * the width of a line, not on the number of lines in a frame.
74 */
75 while (out_width >= vf_info->res.width)
76 {
77 ds_log2++;
78 out_width /= 2;
79 }
80 /* now width is smaller, so we go up one step */
81 if ((ds_log2 > 0) && (out_width < ia_css_binary_max_vf_width()))
82 ds_log2--;
83 /* TODO: use actual max input resolution of vf_pp binary */
84 if ((out_info->res.width >> ds_log2) >= 2 * ia_css_binary_max_vf_width())
85 return -EINVAL;
86 *downscale_log2 = ds_log2;
87 return 0;
88 }
89
90 static int
configure_kernel(const struct ia_css_binary_info * info,const struct ia_css_frame_info * out_info,const struct ia_css_frame_info * vf_info,unsigned int * downscale_log2,struct ia_css_vf_configuration * config)91 configure_kernel(
92 const struct ia_css_binary_info *info,
93 const struct ia_css_frame_info *out_info,
94 const struct ia_css_frame_info *vf_info,
95 unsigned int *downscale_log2,
96 struct ia_css_vf_configuration *config) {
97 int err;
98 unsigned int vf_log_ds = 0;
99
100 /* First compute value */
101 if (vf_info)
102 {
103 err = sh_css_vf_downscale_log2(out_info, vf_info, &vf_log_ds);
104 if (err)
105 return err;
106 }
107 vf_log_ds = min(vf_log_ds, info->vf_dec.max_log_downscale);
108 *downscale_log2 = vf_log_ds;
109
110 /* Then store it in isp config section */
111 config->vf_downscale_bits = vf_log_ds;
112 return 0;
113 }
114
115 static void
configure_dma(struct ia_css_vf_configuration * config,const struct ia_css_frame_info * vf_info)116 configure_dma(
117 struct ia_css_vf_configuration *config,
118 const struct ia_css_frame_info *vf_info)
119 {
120 config->info = vf_info;
121 }
122
123 int
ia_css_vf_configure(const struct ia_css_binary * binary,const struct ia_css_frame_info * out_info,struct ia_css_frame_info * vf_info,unsigned int * downscale_log2)124 ia_css_vf_configure(
125 const struct ia_css_binary *binary,
126 const struct ia_css_frame_info *out_info,
127 struct ia_css_frame_info *vf_info,
128 unsigned int *downscale_log2) {
129 int err;
130 struct ia_css_vf_configuration config;
131 const struct ia_css_binary_info *info = &binary->info->sp;
132
133 err = configure_kernel(info, out_info, vf_info, downscale_log2, &config);
134 if (err)
135 dev_warn(atomisp_dev, "Couldn't setup downscale\n");
136
137 configure_dma(&config, vf_info);
138
139 if (vf_info)
140 vf_info->raw_bit_depth = info->dma.vfdec_bits_per_pixel;
141 ia_css_configure_vf(binary, &config);
142
143 return 0;
144 }
145