ARM: dts: rockchip: Use interpolated brightness tables for veyron
Use interpolated brightness tables (added by commit 573fe6d1c2
("backlight: pwm_bl: Linear interpolation between
brightness-levels") for veyron, instead of specifying every single
step. Some devices/panels have intervals that are smaller than
the specified 'num-interpolated-steps', the driver interprets
these intervals as a single step.
Another option would be to switch to a perceptual brightness curve
(CIE 1931), with the caveat that it would change the behavior of
the backlight. Also the concept of a minimum brightness level is
currently not supported for CIE 1931 curves.
Signed-off-by: Matthias Kaehlcke <mka@chromium.org>
Reviewed-by: Douglas Anderson <dianders@chromium.org>
Link: https://lore.kernel.org/r/20191003094137.v2.1.Ic9fd698810ea569c465350154da40b85d24f805b@changeid
Signed-off-by: Heiko Stuebner <heiko@sntech.de>
This commit is contained in:
Matthias Kaehlcke
Heiko Stuebner
parent
cee0534a08
commit
6233269bce
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@ -41,39 +41,8 @@
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backlight: backlight {
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compatible = "pwm-backlight";
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brightness-levels = <
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0 1 2 3 4 5 6 7
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8 9 10 11 12 13 14 15
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16 17 18 19 20 21 22 23
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24 25 26 27 28 29 30 31
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32 33 34 35 36 37 38 39
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40 41 42 43 44 45 46 47
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48 49 50 51 52 53 54 55
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56 57 58 59 60 61 62 63
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64 65 66 67 68 69 70 71
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72 73 74 75 76 77 78 79
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80 81 82 83 84 85 86 87
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88 89 90 91 92 93 94 95
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96 97 98 99 100 101 102 103
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104 105 106 107 108 109 110 111
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112 113 114 115 116 117 118 119
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120 121 122 123 124 125 126 127
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128 129 130 131 132 133 134 135
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136 137 138 139 140 141 142 143
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144 145 146 147 148 149 150 151
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152 153 154 155 156 157 158 159
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160 161 162 163 164 165 166 167
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168 169 170 171 172 173 174 175
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176 177 178 179 180 181 182 183
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184 185 186 187 188 189 190 191
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192 193 194 195 196 197 198 199
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200 201 202 203 204 205 206 207
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208 209 210 211 212 213 214 215
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216 217 218 219 220 221 222 223
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224 225 226 227 228 229 230 231
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232 233 234 235 236 237 238 239
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240 241 242 243 244 245 246 247
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248 249 250 251 252 253 254 255>;
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brightness-levels = <0 255>;
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num-interpolated-steps = <255>;
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default-brightness-level = <128>;
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enable-gpios = <&gpio7 RK_PA2 GPIO_ACTIVE_HIGH>;
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pinctrl-names = "default";
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@ -20,39 +20,8 @@
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&backlight {
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/* Jaq panel PWM must be >= 3%, so start non-zero brightness at 8 */
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brightness-levels = <
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0
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8 9 10 11 12 13 14 15
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16 17 18 19 20 21 22 23
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24 25 26 27 28 29 30 31
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32 33 34 35 36 37 38 39
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40 41 42 43 44 45 46 47
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48 49 50 51 52 53 54 55
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56 57 58 59 60 61 62 63
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64 65 66 67 68 69 70 71
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72 73 74 75 76 77 78 79
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80 81 82 83 84 85 86 87
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88 89 90 91 92 93 94 95
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96 97 98 99 100 101 102 103
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104 105 106 107 108 109 110 111
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112 113 114 115 116 117 118 119
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120 121 122 123 124 125 126 127
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128 129 130 131 132 133 134 135
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136 137 138 139 140 141 142 143
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144 145 146 147 148 149 150 151
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152 153 154 155 156 157 158 159
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160 161 162 163 164 165 166 167
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168 169 170 171 172 173 174 175
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176 177 178 179 180 181 182 183
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184 185 186 187 188 189 190 191
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192 193 194 195 196 197 198 199
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200 201 202 203 204 205 206 207
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208 209 210 211 212 213 214 215
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216 217 218 219 220 221 222 223
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224 225 226 227 228 229 230 231
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232 233 234 235 236 237 238 239
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240 241 242 243 244 245 246 247
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248 249 250 251 252 253 254 255>;
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brightness-levels = <0 8 255>;
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num-interpolated-steps = <247>;
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};
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&rk808 {
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@ -38,39 +38,8 @@
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&backlight {
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/* Minnie panel PWM must be >= 1%, so start non-zero brightness at 3 */
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brightness-levels = <
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0 3 4 5 6 7
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8 9 10 11 12 13 14 15
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16 17 18 19 20 21 22 23
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24 25 26 27 28 29 30 31
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32 33 34 35 36 37 38 39
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40 41 42 43 44 45 46 47
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48 49 50 51 52 53 54 55
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56 57 58 59 60 61 62 63
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64 65 66 67 68 69 70 71
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72 73 74 75 76 77 78 79
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80 81 82 83 84 85 86 87
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88 89 90 91 92 93 94 95
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96 97 98 99 100 101 102 103
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104 105 106 107 108 109 110 111
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112 113 114 115 116 117 118 119
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120 121 122 123 124 125 126 127
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128 129 130 131 132 133 134 135
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136 137 138 139 140 141 142 143
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144 145 146 147 148 149 150 151
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152 153 154 155 156 157 158 159
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160 161 162 163 164 165 166 167
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168 169 170 171 172 173 174 175
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176 177 178 179 180 181 182 183
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184 185 186 187 188 189 190 191
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192 193 194 195 196 197 198 199
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200 201 202 203 204 205 206 207
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208 209 210 211 212 213 214 215
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216 217 218 219 220 221 222 223
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224 225 226 227 228 229 230 231
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232 233 234 235 236 237 238 239
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240 241 242 243 244 245 246 247
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248 249 250 251 252 253 254 255>;
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brightness-levels = <0 3 255>;
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num-interpolated-steps = <252>;
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};
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&i2c_tunnel {
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@ -23,39 +23,8 @@
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&backlight {
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/* Tiger panel PWM must be >= 1%, so start non-zero brightness at 3 */
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brightness-levels = <
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0 3 4 5 6 7
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8 9 10 11 12 13 14 15
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16 17 18 19 20 21 22 23
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24 25 26 27 28 29 30 31
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32 33 34 35 36 37 38 39
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40 41 42 43 44 45 46 47
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48 49 50 51 52 53 54 55
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56 57 58 59 60 61 62 63
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64 65 66 67 68 69 70 71
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72 73 74 75 76 77 78 79
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80 81 82 83 84 85 86 87
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88 89 90 91 92 93 94 95
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96 97 98 99 100 101 102 103
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104 105 106 107 108 109 110 111
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112 113 114 115 116 117 118 119
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120 121 122 123 124 125 126 127
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128 129 130 131 132 133 134 135
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136 137 138 139 140 141 142 143
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144 145 146 147 148 149 150 151
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152 153 154 155 156 157 158 159
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160 161 162 163 164 165 166 167
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168 169 170 171 172 173 174 175
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176 177 178 179 180 181 182 183
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184 185 186 187 188 189 190 191
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192 193 194 195 196 197 198 199
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200 201 202 203 204 205 206 207
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208 209 210 211 212 213 214 215
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216 217 218 219 220 221 222 223
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224 225 226 227 228 229 230 231
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232 233 234 235 236 237 238 239
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240 241 242 243 244 245 246 247
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248 249 250 251 252 253 254 255>;
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brightness-levels = <0 3 255>;
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num-interpolated-steps = <252>;
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};
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&backlight_regulator {
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