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drm/i915/dsi: Document the panel enable / disable sequences from the spec 

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@redhat.com>
Acked-by: Jani Nikula <jani.nikula@intel.com>
Reviewed-by: Bob Paauwe <bob.j.paauwe@intel.com>
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1488374106-4949-2-git-send-email-jani.nikula@intel.com
This commit is contained in:
Hans de Goede 2017-03-01 15:14:57 +02:00 committed by Jani Nikula
parent 9160095c0e
commit 249f696235
1 changed files with 37 additions and 0 deletions
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37
drivers/gpu/drm/i915/intel_dsi.c
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@ -725,6 +725,43 @@ 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)