On 30/05/2023 00:11, Marijn Suijten wrote:
On 2023-05-22 04:16:20, Dmitry Baryshkov wrote:
<snip>
+ if (ctx->dsi->dsc) {
dsi->dsc is always set, thus this condition can be dropped.
I want to leave room for possibly running the panel without DSC (at a
lower resolution/refresh rate, or at higher power consumption if there
is enough BW) by not assigning the pointer, if we get access to panel
documentation: probably one of the magic commands sent in this driver
controls it but we don't know which.
This sounds like 'a possible room for expansion' which might never be
actually used. I think, if we ever get such information or when the
panel's DSC config gets variadic following the mode, we can reintroduce
this check.
+ drm_dsc_pps_payload_pack(&pps, ctx->dsi->dsc);
+
+ ret = mipi_dsi_picture_parameter_set(ctx->dsi, &pps);
+ if (ret < 0) {
+ dev_err(panel->dev, "failed to transmit PPS: %d\n", ret);
+ goto fail;
+ }
+ ret = mipi_dsi_compression_mode(ctx->dsi, true);
+ if (ret < 0) {
+ dev_err(dev, "failed to enable compression mode: %d\n", ret);
+ goto fail;
+ }
+
+ msleep(28);
+ }
+
+ ctx->prepared = true;
+ return 0;
+
+fail:
+ gpiod_set_value_cansleep(ctx->reset_gpio, 0);
+ regulator_disable(ctx->vddio);
+ return ret;
+}
<snip>
+ /* This panel only supports DSC; unconditionally enable it */
--
With best wishes
Dmitry
