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
ia_css_vf_config(struct sh_css_isp_vf_isp_config * to,const struct ia_css_vf_configuration * from,unsigned int size)29 int ia_css_vf_config(struct sh_css_isp_vf_isp_config *to,
30 const struct ia_css_vf_configuration *from,
31 unsigned int size)
32 {
33 unsigned int elems_a = ISP_VEC_NELEMS;
34 int ret;
35
36 to->vf_downscale_bits = from->vf_downscale_bits;
37 to->enable = from->info != NULL;
38
39 if (from->info) {
40 ia_css_frame_info_to_frame_sp_info(&to->info, from->info);
41 ret = ia_css_dma_configure_from_info(&to->dma.port_b, from->info);
42 if (ret)
43 return ret;
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 if (elems_a % to->dma.port_b.elems != 0)
48 return -EINVAL;
49 }
50 return 0;
51 }
52
53 /* compute the log2 of the downscale factor needed to get closest
54 * to the requested viewfinder resolution on the upper side. The output cannot
55 * be smaller than the requested viewfinder resolution.
56 */
57 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)58 sh_css_vf_downscale_log2(
59 const struct ia_css_frame_info *out_info,
60 const struct ia_css_frame_info *vf_info,
61 unsigned int *downscale_log2) {
62 unsigned int ds_log2 = 0;
63 unsigned int out_width;
64
65 if ((!out_info) || (!vf_info))
66 return -EINVAL;
67
68 out_width = out_info->res.width;
69
70 if (out_width == 0)
71 return -EINVAL;
72
73 /* downscale until width smaller than the viewfinder width. We don't
74 * test for the height since the vmem buffers only put restrictions on
75 * the width of a line, not on the number of lines in a frame.
76 */
77 while (out_width >= vf_info->res.width)
78 {
79 ds_log2++;
80 out_width /= 2;
81 }
82 /* now width is smaller, so we go up one step */
83 if ((ds_log2 > 0) && (out_width < ia_css_binary_max_vf_width()))
84 ds_log2--;
85 /* TODO: use actual max input resolution of vf_pp binary */
86 if ((out_info->res.width >> ds_log2) >= 2 * ia_css_binary_max_vf_width())
87 return -EINVAL;
88 *downscale_log2 = ds_log2;
89 return 0;
90 }
91
92 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)93 configure_kernel(
94 const struct ia_css_binary_info *info,
95 const struct ia_css_frame_info *out_info,
96 const struct ia_css_frame_info *vf_info,
97 unsigned int *downscale_log2,
98 struct ia_css_vf_configuration *config) {
99 int err;
100 unsigned int vf_log_ds = 0;
101
102 /* First compute value */
103 if (vf_info)
104 {
105 err = sh_css_vf_downscale_log2(out_info, vf_info, &vf_log_ds);
106 if (err)
107 return err;
108 }
109 vf_log_ds = min(vf_log_ds, info->vf_dec.max_log_downscale);
110 *downscale_log2 = vf_log_ds;
111
112 /* Then store it in isp config section */
113 config->vf_downscale_bits = vf_log_ds;
114 return 0;
115 }
116
117 static void
configure_dma(struct ia_css_vf_configuration * config,const struct ia_css_frame_info * vf_info)118 configure_dma(
119 struct ia_css_vf_configuration *config,
120 const struct ia_css_frame_info *vf_info)
121 {
122 config->info = vf_info;
123 }
124
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)125 int ia_css_vf_configure(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 {
130 int err;
131 struct ia_css_vf_configuration config;
132 const struct ia_css_binary_info *info = &binary->info->sp;
133
134 err = configure_kernel(info, out_info, vf_info, downscale_log2, &config);
135 if (err)
136 dev_warn(atomisp_dev, "Couldn't setup downscale\n");
137
138 configure_dma(&config, vf_info);
139
140 if (vf_info)
141 vf_info->raw_bit_depth = info->dma.vfdec_bits_per_pixel;
142
143 return ia_css_configure_vf(binary, &config);
144 }
145