Document the DSI panel enable / disable sequences from the spec, for easy comparison between the code and the spec. Signed-off-by: Hans de Goede <hdegoede@xxxxxxxxxx> Acked-by: Jani Nikula <jani.nikula@xxxxxxxxx> --- Changes in v2: -Make the comment a table with 3 columns for easier comparison of the 3 sequences --- drivers/gpu/drm/i915/intel_dsi.c | 37 +++++++++++++++++++++++++++++++++++++ 1 file changed, 37 insertions(+) diff --git a/drivers/gpu/drm/i915/intel_dsi.c b/drivers/gpu/drm/i915/intel_dsi.c index 20ed799..c271475 100644 --- a/drivers/gpu/drm/i915/intel_dsi.c +++ b/drivers/gpu/drm/i915/intel_dsi.c @@ -554,6 +554,43 @@ static void intel_dsi_prepare(struct intel_encoder *intel_encoder, struct intel_crtc_state *pipe_config); static void intel_dsi_unprepare(struct intel_encoder *encoder); +/* + * Panel enable/disable sequences from the VBT spec. + * + * Note the spec has AssertReset / DeassertReset swapped from their + * usual naming. We use the normal names to avoid confusion (so below + * they are swapped compared to the spec). + * + * Steps starting with MIPI refer to VBT sequences, note that for v2 + * VBTs several steps which have a VBT in v2 are expected to be handled + * directly by the driver, by directly driving gpios for example. + * + * v2 video mode seq v3 video mode seq command mode seq + * - power on - MIPIPanelPowerOn - power on + * - wait t1+t2 - wait t1+t2 + * - MIPIDeassertResetPin - MIPIDeassertResetPin - MIPIDeassertResetPin + * - io lines to lp-11 - io lines to lp-11 - io lines to lp-11 + * - MIPISendInitialDcsCmds - MIPISendInitialDcsCmds - MIPISendInitialDcsCmds + * - MIPITearOn + * - MIPIDisplayOn + * - turn on DPI - turn on DPI - set pipe to dsr mode + * - MIPIDisplayOn - MIPIDisplayOn + * - wait t5 - wait t5 + * - backlight on - MIPIBacklightOn - backlight on + * ... ... ... issue mem cmds ... + * - backlight off - MIPIBacklightOff - backlight off + * - wait t6 - wait t6 + * - MIPIDisplayOff + * - turn off DPI - turn off DPI - disable pipe dsr mode + * - MIPITearOff + * - MIPIDisplayOff - MIPIDisplayOff + * - io lines to lp-00 - io lines to lp-00 - io lines to lp-00 + * - MIPIAssertResetPin - MIPIAssertResetPin - MIPIAssertResetPin + * - wait t3 - wait t3 + * - power off - MIPIPanelPowerOff - power off + * - wait t4 - wait t4 + */ + static void intel_dsi_pre_enable(struct intel_encoder *encoder, struct intel_crtc_state *pipe_config, struct drm_connector_state *conn_state) -- 2.9.3 _______________________________________________ dri-devel mailing list dri-devel@xxxxxxxxxxxxxxxxxxxxx https://lists.freedesktop.org/mailman/listinfo/dri-devel
