drm/panel: sharp: lq101r1sx01: Respect power timings
Before shutting down the display using the DCS display_off command, wait for 4 frames according to the datasheet. Furthermore, after enabling the power supply, the supply voltage needs around 10 ms to settle. After that, another 120 ms is required before a DCS exit_sleep_mode command can be sent. While at it, no longer send the DCS soft_reset command. This is totally unnecessary because we've just powered up the display, hence it will be in a reset state already. Signed-off-by: Thierry Reding <treding@nvidia.com>
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@ -116,6 +116,8 @@ static int sharp_panel_unprepare(struct drm_panel *panel)
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if (!sharp->prepared)
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return 0;
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sharp_wait_frames(sharp, 4);
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err = mipi_dsi_dcs_set_display_off(sharp->link1);
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if (err < 0)
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dev_err(panel->dev, "failed to set display off: %d\n", err);
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@ -180,15 +182,13 @@ static int sharp_panel_prepare(struct drm_panel *panel)
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if (err < 0)
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return err;
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usleep_range(10000, 20000);
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err = mipi_dsi_dcs_soft_reset(sharp->link1);
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if (err < 0) {
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dev_err(panel->dev, "soft reset failed: %d\n", err);
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goto poweroff;
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}
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msleep(120);
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/*
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* According to the datasheet, the panel needs around 10 ms to fully
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* power up. At least another 120 ms is required before exiting sleep
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* mode to make sure the panel is ready. Throw in another 20 ms for
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* good measure.
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*/
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msleep(150);
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err = mipi_dsi_dcs_exit_sleep_mode(sharp->link1);
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if (err < 0) {
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