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authorMagnus Damm <damm@igel.co.jp>2008-12-19 15:34:41 +0900
committerPaul Mundt <lethal@linux-sh.org>2008-12-22 18:44:48 +0900
commit8564557a03c12adb9c4b76ae1e86db4113a04d13 (patch)
tree680fbc6f67382b76262477259fff4601c5e7a45e /include/video
parent37b4837959cb9aa60686ca0d85f73d819251abad (diff)
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video: sh_mobile_lcdcfb deferred io support
This patch adds sh_mobile_lcdcfb deferred io support for SYS panels. The LCDC hardware block managed by the sh_mobile_lcdcfb driver supports RGB or SYS panel configurations. SYS panels come with an external display controller that is resposible for refreshing the actual LCD panel. RGB panels are controlled directly by the LCDC and they need to be refreshed by the LCDC hardware. In the case of SYS panels we can save some power by configuring the LCDC hardware block in one-shot mode. In this one-shot mode panel refresh is managed by software. This works well together with deferred io since it allows us to stop clocks for most of the time and only enable clocks when we actually want to trigger an update. When there is no fbdev activity the clocks are kept stopped which allows us to deep sleep. The refresh rate in deferred io mode is set using platform data. The same platform data can also be used to disable deferred io mode. As with other deferred io frame buffers user space code should use fsync() on the frame buffer device to trigger an update. Signed-off-by: Magnus Damm <damm@igel.co.jp> Signed-off-by: Paul Mundt <lethal@linux-sh.org>
Diffstat (limited to 'include/video')
-rw-r--r--include/video/sh_mobile_lcdc.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/include/video/sh_mobile_lcdc.h b/include/video/sh_mobile_lcdc.h
index 1a4bc6ada60..25144ab22b9 100644
--- a/include/video/sh_mobile_lcdc.h
+++ b/include/video/sh_mobile_lcdc.h
@@ -37,6 +37,7 @@ enum { LCDC_CLK_BUS, LCDC_CLK_PERIPHERAL, LCDC_CLK_EXTERNAL };
struct sh_mobile_lcdc_sys_bus_cfg {
unsigned long ldmt2r;
unsigned long ldmt3r;
+ unsigned long deferred_io_msec;
};
struct sh_mobile_lcdc_sys_bus_ops {