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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>
hifive-unleashed-5.1
Thierry Reding 2014-12-08 15:38:17 +01:00
parent 4569619d0f
commit ee920bca27
1 changed files with 9 additions and 9 deletions
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18
drivers/gpu/drm/panel/panel-sharp-lq101r1sx01.c
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@ -116,6 +116,8 @@ static int sharp_panel_unprepare(struct drm_panel *panel)
if (!sharp->prepared)
return 0;
sharp_wait_frames(sharp, 4);
err = mipi_dsi_dcs_set_display_off(sharp->link1);
if (err < 0)
dev_err(panel->dev, "failed to set display off: %d\n", err);
@ -180,15 +182,13 @@ static int sharp_panel_prepare(struct drm_panel *panel)
if (err < 0)
return err;
usleep_range(10000, 20000);
err = mipi_dsi_dcs_soft_reset(sharp->link1);
if (err < 0) {
dev_err(panel->dev, "soft reset failed: %d\n", err);
goto poweroff;
}
msleep(120);
/*
* According to the datasheet, the panel needs around 10 ms to fully
* power up. At least another 120 ms is required before exiting sleep
* mode to make sure the panel is ready. Throw in another 20 ms for
* good measure.
*/
msleep(150);
err = mipi_dsi_dcs_exit_sleep_mode(sharp->link1);
if (err < 0) {