You cannot select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
129 lines
4.4 KiB
Diff
129 lines
4.4 KiB
Diff
From a2ef813d2f439a3e9f377d33a2e5baad098afb7e Mon Sep 17 00:00:00 2001
|
|
From: Harald Welte <laforge@openmoko.org>
|
|
Date: Wed, 8 Oct 2008 21:36:23 +0100
|
|
Subject: [PATCH] glamo_fb: Implement screen blanking
|
|
|
|
This patch implements fb_blank() for the glamo-fb driver, which switches off
|
|
the pixel clock (DCLK) for power saving.
|
|
|
|
We currently delay the actual pixel clock switch until we enter
|
|
FB_BLANK_POWERDOWN, since the backlight fade is slow and we don't want the
|
|
user to see artefacts on the screen while the backlight is fading out.
|
|
|
|
So since the X server first sends FB_BLANK_{V,H}SYNC_SUSPEND, we start the
|
|
backlight fade here, and only once we get FB_BLANK_POWERDOWN the pixel clock is
|
|
disabled.
|
|
|
|
There are no measurements yet, but the power savings should be double, since
|
|
there is no longer any generation of the high-frequency LCM signals, and
|
|
there are no video-related SDRAM accesses anymore.
|
|
|
|
Signed-off-by: Harald Welte <laforge@openmoko.org>
|
|
---
|
|
drivers/mfd/glamo/glamo-core.c | 32 ++++++++++++++++++++++++++++++++
|
|
drivers/mfd/glamo/glamo-core.h | 6 ++++++
|
|
drivers/mfd/glamo/glamo-fb.c | 29 ++++++++++++++++++++++++++++-
|
|
3 files changed, 66 insertions(+), 1 deletions(-)
|
|
|
|
diff --git a/drivers/mfd/glamo/glamo-core.c b/drivers/mfd/glamo/glamo-core.c
|
|
index 2619c5f..58ee3e2 100644
|
|
--- a/drivers/mfd/glamo/glamo-core.c
|
|
+++ b/drivers/mfd/glamo/glamo-core.c
|
|
@@ -524,6 +524,38 @@ int glamo_engine_disable(struct glamo_core *glamo, enum glamo_engine engine)
|
|
}
|
|
EXPORT_SYMBOL_GPL(glamo_engine_disable);
|
|
|
|
+static const u_int16_t engine_clock_regs[__NUM_GLAMO_ENGINES] = {
|
|
+ [GLAMO_ENGINE_LCD] = GLAMO_REG_CLOCK_LCD,
|
|
+ [GLAMO_ENGINE_MMC] = GLAMO_REG_CLOCK_MMC,
|
|
+ [GLAMO_ENGINE_ISP] = GLAMO_REG_CLOCK_ISP,
|
|
+ [GLAMO_ENGINE_JPEG] = GLAMO_REG_CLOCK_JPEG,
|
|
+ [GLAMO_ENGINE_3D] = GLAMO_REG_CLOCK_3D,
|
|
+ [GLAMO_ENGINE_2D] = GLAMO_REG_CLOCK_2D,
|
|
+ [GLAMO_ENGINE_MPEG_ENC] = GLAMO_REG_CLOCK_MPEG,
|
|
+ [GLAMO_ENGINE_MPEG_DEC] = GLAMO_REG_CLOCK_MPEG,
|
|
+};
|
|
+
|
|
+void glamo_engine_clkreg_set(struct glamo_core *glamo,
|
|
+ enum glamo_engine engine,
|
|
+ u_int16_t mask, u_int16_t val)
|
|
+{
|
|
+ reg_set_bit_mask(glamo, engine_clock_regs[engine], mask, val);
|
|
+}
|
|
+EXPORT_SYMBOL_GPL(glamo_engine_clkreg_set);
|
|
+
|
|
+u_int16_t glamo_engine_clkreg_get(struct glamo_core *glamo,
|
|
+ enum glamo_engine engine)
|
|
+{
|
|
+ u_int16_t val;
|
|
+
|
|
+ spin_lock(&glamo->lock);
|
|
+ val = __reg_read(glamo, engine_clock_regs[engine]);
|
|
+ spin_unlock(&glamo->lock);
|
|
+
|
|
+ return val;
|
|
+}
|
|
+EXPORT_SYMBOL_GPL(glamo_engine_clkreg_get);
|
|
+
|
|
struct glamo_script reset_regs[] = {
|
|
[GLAMO_ENGINE_LCD] = {
|
|
GLAMO_REG_CLOCK_LCD, GLAMO_CLOCK_LCD_RESET
|
|
diff --git a/drivers/mfd/glamo/glamo-core.h b/drivers/mfd/glamo/glamo-core.h
|
|
index ac5eacf..fb5f0f6 100644
|
|
--- a/drivers/mfd/glamo/glamo-core.h
|
|
+++ b/drivers/mfd/glamo/glamo-core.h
|
|
@@ -98,4 +98,10 @@ void glamo_engine_reset(struct glamo_core *glamo, enum glamo_engine engine);
|
|
int glamo_engine_reclock(struct glamo_core *glamo,
|
|
enum glamo_engine engine, int ps);
|
|
|
|
+void glamo_engine_clkreg_set(struct glamo_core *glamo,
|
|
+ enum glamo_engine engine,
|
|
+ u_int16_t mask, u_int16_t val);
|
|
+
|
|
+u_int16_t glamo_engine_clkreg_get(struct glamo_core *glamo,
|
|
+ enum glamo_engine engine);
|
|
#endif /* __GLAMO_CORE_H */
|
|
diff --git a/drivers/mfd/glamo/glamo-fb.c b/drivers/mfd/glamo/glamo-fb.c
|
|
index 8f5d6b1..5cd6e05 100644
|
|
--- a/drivers/mfd/glamo/glamo-fb.c
|
|
+++ b/drivers/mfd/glamo/glamo-fb.c
|
|
@@ -420,7 +420,34 @@ static int glamofb_set_par(struct fb_info *info)
|
|
|
|
static int glamofb_blank(int blank_mode, struct fb_info *info)
|
|
{
|
|
- /* FIXME */
|
|
+ struct glamofb_handle *gfb = info->par;
|
|
+ struct glamo_core *gcore = gfb->mach_info->glamo;
|
|
+
|
|
+ dev_dbg(gfb->dev, "glamofb_blank(%u)\n", blank_mode);
|
|
+
|
|
+ switch (blank_mode) {
|
|
+ case FB_BLANK_VSYNC_SUSPEND:
|
|
+ case FB_BLANK_HSYNC_SUSPEND:
|
|
+ /* FIXME: add pdata hook/flag to indicate whether
|
|
+ * we should already switch off pixel clock here */
|
|
+ break;
|
|
+ case FB_BLANK_POWERDOWN:
|
|
+ /* disable the pixel clock */
|
|
+ glamo_engine_clkreg_set(gcore, GLAMO_ENGINE_LCD,
|
|
+ GLAMO_CLOCK_LCD_EN_DCLK, 0);
|
|
+ break;
|
|
+ case FB_BLANK_UNBLANK:
|
|
+ case FB_BLANK_NORMAL:
|
|
+ /* enable the pixel clock */
|
|
+ glamo_engine_clkreg_set(gcore, GLAMO_ENGINE_LCD,
|
|
+ GLAMO_CLOCK_LCD_EN_DCLK,
|
|
+ GLAMO_CLOCK_LCD_EN_DCLK);
|
|
+ break;
|
|
+ }
|
|
+
|
|
+ /* FIXME: once we have proper clock management in glamo-core,
|
|
+ * we can determine if other units need MCLK1 or the PLL, and
|
|
+ * disable it if not used. */
|
|
return 0;
|
|
}
|
|
|
|
--
|
|
1.5.6.5
|
|
|