Re: [PATCH] arm64: dts: rockchip: move backlight from sapphire to excavator

Enric Balletbo Serra
2018-10-30T16:58:49Z

Hi Vicente,

Missatge de Vicente Bergas <vicencb@gmail.com> del dia dt., 30 d’oct.
2018 a les 16:21:
>
> The backlight is for the eDP panel and it has the connector on the excavator baseboard.
>
> Signed-off-by: Vicente Bergas <vicencb@gmail.com>
> ---
> .../rockchip/rk3399-sapphire-excavator.dts | 46 +++++++++++++++++--
> .../boot/dts/rockchip/rk3399-sapphire.dtsi | 39 ----------------
> 2 files changed, 41 insertions(+), 44 deletions(-)
>
> diff --git a/arch/arm64/boot/dts/rockchip/rk3399-sapphire-excavator.dts b/arch/arm64/boot/dts/rockchip/rk3399-sapphire-excavator.dts
> index fef2c0608..0b8f1edbd 100644
> --- a/arch/arm64/boot/dts/rockchip/rk3399-sapphire-excavator.dts
> +++ b/arch/arm64/boot/dts/rockchip/rk3399-sapphire-excavator.dts
> @@ -42,6 +42,47 @@
> };
> };
>
> + backlight: backlight {
> + compatible = "pwm-backlight";
> + brightness-levels = <
> + 0 1 2 3 4 5 6 7
> + 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>;
> + default-brightness-level = <200>;

Could you try if just removing the brightness-level table and
default-brightness-level properties gives you a good backlight
experience?

After commit 88ba95bedb79 ("backlight: pwm_bl: Compute brightness of LED
linearly to human eye") the pwm_bl driver is able to calculate a default
brightness table. The calculated table for this PWM will have more
granularity and will be adjusted to change the brightness linearly to
the human eye.

If it works maybe we can just get rid of this awful brightness-table.

Best regards,
Enric

> + enable-gpios = <&gpio1 RK_PB5 GPIO_ACTIVE_HIGH>;
> + pwms = <&pwm0 0 25000 0>;
> + status = "okay";
> + };
> +
> edp_panel: edp-panel {
> compatible ="lg,lp079qx1-sp0v", "simple-panel";
> backlight = <&backlight>;
> @@ -95,11 +136,6 @@
> };
> };
>
> -&backlight {
> - enable-gpios = <&gpio1 RK_PB5 GPIO_ACTIVE_HIGH>;
> - status = "okay";
> -};
> -
> &edp {
> status = "okay";
>
> diff --git a/arch/arm64/boot/dts/rockchip/rk3399-sapphire.dtsi b/arch/arm64/boot/dts/rockchip/rk3399-sapphire.dtsi
> index 2eb6489d4..6ce5a42c9 100644
> --- a/arch/arm64/boot/dts/rockchip/rk3399-sapphire.dtsi
> +++ b/arch/arm64/boot/dts/rockchip/rk3399-sapphire.dtsi
> @@ -15,45 +15,6 @@
> stdout-path = "serial2:1500000n8";
> };
>
> - backlight: backlight {
> - compatible = "pwm-backlight";
> - brightness-levels = <
> - 0 1 2 3 4 5 6 7
> - 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>;
> - default-brightness-level = <200>;
> - pwms = <&pwm0 0 25000 0>;
> - };
> -
> clkin_gmac: external-gmac-clock {
> compatible = "fixed-clock";
> clock-frequency = <125000000>;
> --
> 2.19.1
>
>
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