On Tuesday 19 April 2011 02:52 PM, Valkeinen, Tomi wrote:
ULPS (Ultra-Low Power State) is a power saving method for DSI bus. When the ULPS is entered, the host sends an ULPS entry sequence and pulls the DSI lines down. On ULPS exit, the host sends an exit sequence and continues normal operation. This allows both the host and the DSI peripheral to save some power while in ULPS. This patch set implements ULPS support for DSS2. ULPS can be used with DSI command mode displays, and as command mode displays can refresh the panel independently using its own framebuffer, entering ULPS allows OMAP DSS HW to be totally turned off while the image on the display stays. This in turn may allow OMAP to enter deep sleep. Taal panel driver implements an inactivity timer which is used to enter ULPS after a certain period. The period can configured via sysfs, "ulps_timeout" file. A good value for the ulps_timeout depends on the use case and board, but is most likely around 100-500ms. The patch set does not enable the ULPS timeout, but it has to be enabled either manually via sysfs or from the board file. Tested on OMAP 4430 Blaze board. The patches are based on the current DSS2 master branch.
Tested on 4430sdp and 3430sdp with Taal Panel. Archit
Tomi Tomi Valkeinen (19): OMAP: DSS2: DSI: Add lane override functions OMAP: DSS2: DSI: Remove CIO LDO status check OMAP: DSS2: DSI: implement ULPS enter and exit OMAP: DSS2: DSI: add option to leave DSI lanes powered on OMAP: DSS2: DSI: rename complexio related functions OMAP: DSS2: Add FEAT_DSI_REVERSE_TXCLKESC OMAP: DSS2: DSI: fix _dsi_print_reset_status OMAP: DSS2: DSI: implement enable/disable SCP clk OMAP: DSS2: DSI: fix CIO init and uninit OMAP: DSS2: DSI: wait for TXCLKESC domain to come out of reset OMAP: DSS2: DSI: add parameter to enter ulps on disable OMAP: DSS2: DSI: Add DSI pad muxing support OMAP: DSS2: DSI: ensure VDDS_DSI is disabled on exit OMAP: DSS2: Taal: Implement configurable ESD interval OMAP: DSS2: Taal: Clean up ESD queueing OMAP: DSS2: Taal: Add sysfs file for ESD interval OMAP: DSS2: Taal: Separate panel reset OMAP: DSS2: Taal: Rename esd_wq to workqueue OMAP: DSS2: Taal: Implement ULPS functionality arch/arm/mach-omap2/board-4430sdp.c | 2 +- arch/arm/plat-omap/include/plat/display.h | 4 +- arch/arm/plat-omap/include/plat/nokia-dsi-panel.h | 6 +- drivers/video/omap2/displays/panel-taal.c | 420 +++++++++++++++++++-- drivers/video/omap2/dss/dpi.c | 4 +- drivers/video/omap2/dss/dsi.c | 427 +++++++++++++++++---- drivers/video/omap2/dss/dss.h | 2 +- drivers/video/omap2/dss/dss_features.c | 4 +- drivers/video/omap2/dss/dss_features.h | 6 +- 9 files changed, 764 insertions(+), 111 deletions(-) -- To unsubscribe from this list: send the line "unsubscribe linux-omap" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
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