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Commit 249f6962 authored by Hans de Goede's avatar Hans de Goede Committed by Jani Nikula
Browse files

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: default avatarHans de Goede <hdegoede@redhat.com>
Acked-by: default avatarJani Nikula <jani.nikula@intel.com>
Reviewed-by: default avatarBob Paauwe <bob.j.paauwe@intel.com>
Signed-off-by: default avatarJani Nikula <jani.nikula@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1488374106-4949-2-git-send-email-jani.nikula@intel.com
parent 9160095c

drivers/gpu/drm/i915/intel_dsi.c

+37 −0
Original line number Diff line number Diff line
@@ -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)