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| author | Matthias Kaehlcke <mka@chromium.org> | 2019-10-03 09:41:52 -0700 |
|---|---|---|
| committer | Heiko Stuebner <heiko@sntech.de> | 2019-10-10 23:23:17 +0200 |
| commit | 6233269bce47bd450196a671ab28eb1ec5eb88d9 (patch) | |
| tree | e694d39d3fd9620316b416ac7f42f850e146784a /arch/arm/boot/dts/rk3288-veyron-jaq.dts | |
| parent | cee0534a08d0ccc07b4e4405d77c5c9da78a4fa9 (diff) | |
| download | lwn-6233269bce47bd450196a671ab28eb1ec5eb88d9.tar.gz lwn-6233269bce47bd450196a671ab28eb1ec5eb88d9.zip | |
ARM: dts: rockchip: Use interpolated brightness tables for veyron
Use interpolated brightness tables (added by commit 573fe6d1c25
("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>
Diffstat (limited to 'arch/arm/boot/dts/rk3288-veyron-jaq.dts')
| -rw-r--r-- | arch/arm/boot/dts/rk3288-veyron-jaq.dts | 35 |
1 files changed, 2 insertions, 33 deletions
diff --git a/arch/arm/boot/dts/rk3288-veyron-jaq.dts b/arch/arm/boot/dts/rk3288-veyron-jaq.dts index 80386203e85b..a4966e505a2f 100644 --- a/arch/arm/boot/dts/rk3288-veyron-jaq.dts +++ b/arch/arm/boot/dts/rk3288-veyron-jaq.dts @@ -20,39 +20,8 @@ &backlight { /* Jaq panel PWM must be >= 3%, so start non-zero brightness at 8 */ - brightness-levels = < - 0 - 8 9 10 11 12 13 14 15 - 16 17 18 19 20 21 22 23 - 24 25 26 27 28 29 30 31 - 32 33 34 35 36 37 38 39 - 40 41 42 43 44 45 46 47 - 48 49 50 51 52 53 54 55 - 56 57 58 59 60 61 62 63 - 64 65 66 67 68 69 70 71 - 72 73 74 75 76 77 78 79 - 80 81 82 83 84 85 86 87 - 88 89 90 91 92 93 94 95 - 96 97 98 99 100 101 102 103 - 104 105 106 107 108 109 110 111 - 112 113 114 115 116 117 118 119 - 120 121 122 123 124 125 126 127 - 128 129 130 131 132 133 134 135 - 136 137 138 139 140 141 142 143 - 144 145 146 147 148 149 150 151 - 152 153 154 155 156 157 158 159 - 160 161 162 163 164 165 166 167 - 168 169 170 171 172 173 174 175 - 176 177 178 179 180 181 182 183 - 184 185 186 187 188 189 190 191 - 192 193 194 195 196 197 198 199 - 200 201 202 203 204 205 206 207 - 208 209 210 211 212 213 214 215 - 216 217 218 219 220 221 222 223 - 224 225 226 227 228 229 230 231 - 232 233 234 235 236 237 238 239 - 240 241 242 243 244 245 246 247 - 248 249 250 251 252 253 254 255>; + brightness-levels = <0 8 255>; + num-interpolated-steps = <247>; }; &rk808 { |