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fc54b9bf15
(stable-branch of Openmoko) git-svn-id: svn://svn.openwrt.org/openwrt/trunk@13613 3c298f89-4303-0410-b956-a3cf2f4a3e73
129 lines
4.4 KiB
Diff
129 lines
4.4 KiB
Diff
From a2ef813d2f439a3e9f377d33a2e5baad098afb7e Mon Sep 17 00:00:00 2001
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From: Harald Welte <laforge@openmoko.org>
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Date: Wed, 8 Oct 2008 21:36:23 +0100
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Subject: [PATCH] glamo_fb: Implement screen blanking
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This patch implements fb_blank() for the glamo-fb driver, which switches off
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the pixel clock (DCLK) for power saving.
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We currently delay the actual pixel clock switch until we enter
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FB_BLANK_POWERDOWN, since the backlight fade is slow and we don't want the
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user to see artefacts on the screen while the backlight is fading out.
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So since the X server first sends FB_BLANK_{V,H}SYNC_SUSPEND, we start the
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backlight fade here, and only once we get FB_BLANK_POWERDOWN the pixel clock is
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disabled.
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There are no measurements yet, but the power savings should be double, since
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there is no longer any generation of the high-frequency LCM signals, and
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there are no video-related SDRAM accesses anymore.
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Signed-off-by: Harald Welte <laforge@openmoko.org>
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---
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drivers/mfd/glamo/glamo-core.c | 32 ++++++++++++++++++++++++++++++++
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drivers/mfd/glamo/glamo-core.h | 6 ++++++
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drivers/mfd/glamo/glamo-fb.c | 29 ++++++++++++++++++++++++++++-
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3 files changed, 66 insertions(+), 1 deletions(-)
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diff --git a/drivers/mfd/glamo/glamo-core.c b/drivers/mfd/glamo/glamo-core.c
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index 2619c5f..58ee3e2 100644
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--- a/drivers/mfd/glamo/glamo-core.c
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+++ b/drivers/mfd/glamo/glamo-core.c
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@@ -524,6 +524,38 @@ int glamo_engine_disable(struct glamo_core *glamo, enum glamo_engine engine)
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}
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EXPORT_SYMBOL_GPL(glamo_engine_disable);
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+static const u_int16_t engine_clock_regs[__NUM_GLAMO_ENGINES] = {
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+ [GLAMO_ENGINE_LCD] = GLAMO_REG_CLOCK_LCD,
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+ [GLAMO_ENGINE_MMC] = GLAMO_REG_CLOCK_MMC,
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+ [GLAMO_ENGINE_ISP] = GLAMO_REG_CLOCK_ISP,
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+ [GLAMO_ENGINE_JPEG] = GLAMO_REG_CLOCK_JPEG,
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+ [GLAMO_ENGINE_3D] = GLAMO_REG_CLOCK_3D,
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+ [GLAMO_ENGINE_2D] = GLAMO_REG_CLOCK_2D,
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+ [GLAMO_ENGINE_MPEG_ENC] = GLAMO_REG_CLOCK_MPEG,
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+ [GLAMO_ENGINE_MPEG_DEC] = GLAMO_REG_CLOCK_MPEG,
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+};
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+
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+void glamo_engine_clkreg_set(struct glamo_core *glamo,
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+ enum glamo_engine engine,
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+ u_int16_t mask, u_int16_t val)
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+{
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+ reg_set_bit_mask(glamo, engine_clock_regs[engine], mask, val);
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+}
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+EXPORT_SYMBOL_GPL(glamo_engine_clkreg_set);
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+
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+u_int16_t glamo_engine_clkreg_get(struct glamo_core *glamo,
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+ enum glamo_engine engine)
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+{
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+ u_int16_t val;
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+
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+ spin_lock(&glamo->lock);
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+ val = __reg_read(glamo, engine_clock_regs[engine]);
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+ spin_unlock(&glamo->lock);
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+
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+ return val;
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+}
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+EXPORT_SYMBOL_GPL(glamo_engine_clkreg_get);
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+
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struct glamo_script reset_regs[] = {
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[GLAMO_ENGINE_LCD] = {
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GLAMO_REG_CLOCK_LCD, GLAMO_CLOCK_LCD_RESET
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diff --git a/drivers/mfd/glamo/glamo-core.h b/drivers/mfd/glamo/glamo-core.h
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index ac5eacf..fb5f0f6 100644
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--- a/drivers/mfd/glamo/glamo-core.h
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+++ b/drivers/mfd/glamo/glamo-core.h
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@@ -98,4 +98,10 @@ void glamo_engine_reset(struct glamo_core *glamo, enum glamo_engine engine);
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int glamo_engine_reclock(struct glamo_core *glamo,
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enum glamo_engine engine, int ps);
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+void glamo_engine_clkreg_set(struct glamo_core *glamo,
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+ enum glamo_engine engine,
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+ u_int16_t mask, u_int16_t val);
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+
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+u_int16_t glamo_engine_clkreg_get(struct glamo_core *glamo,
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+ enum glamo_engine engine);
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#endif /* __GLAMO_CORE_H */
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diff --git a/drivers/mfd/glamo/glamo-fb.c b/drivers/mfd/glamo/glamo-fb.c
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index 8f5d6b1..5cd6e05 100644
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--- a/drivers/mfd/glamo/glamo-fb.c
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+++ b/drivers/mfd/glamo/glamo-fb.c
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@@ -420,7 +420,34 @@ static int glamofb_set_par(struct fb_info *info)
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static int glamofb_blank(int blank_mode, struct fb_info *info)
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{
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- /* FIXME */
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+ struct glamofb_handle *gfb = info->par;
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+ struct glamo_core *gcore = gfb->mach_info->glamo;
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+
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+ dev_dbg(gfb->dev, "glamofb_blank(%u)\n", blank_mode);
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+
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+ switch (blank_mode) {
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+ case FB_BLANK_VSYNC_SUSPEND:
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+ case FB_BLANK_HSYNC_SUSPEND:
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+ /* FIXME: add pdata hook/flag to indicate whether
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+ * we should already switch off pixel clock here */
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+ break;
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+ case FB_BLANK_POWERDOWN:
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+ /* disable the pixel clock */
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+ glamo_engine_clkreg_set(gcore, GLAMO_ENGINE_LCD,
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+ GLAMO_CLOCK_LCD_EN_DCLK, 0);
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+ break;
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+ case FB_BLANK_UNBLANK:
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+ case FB_BLANK_NORMAL:
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+ /* enable the pixel clock */
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+ glamo_engine_clkreg_set(gcore, GLAMO_ENGINE_LCD,
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+ GLAMO_CLOCK_LCD_EN_DCLK,
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+ GLAMO_CLOCK_LCD_EN_DCLK);
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+ break;
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+ }
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+
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+ /* FIXME: once we have proper clock management in glamo-core,
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+ * we can determine if other units need MCLK1 or the PLL, and
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+ * disable it if not used. */
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return 0;
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}
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--
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1.5.6.5
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