From d6456697fa63719b245bf1cfe35b77e6ac7fe63c Mon Sep 17 00:00:00 2001 From: Harald Welte Date: Wed, 19 Nov 2008 17:11:00 +0000 Subject: 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 --- drivers/mfd/glamo/glamo-core.c | 32 ++++++++++++++++++++++++++++++++ 1 file changed, 32 insertions(+) (limited to 'drivers/mfd/glamo/glamo-core.c') diff --git a/drivers/mfd/glamo/glamo-core.c b/drivers/mfd/glamo/glamo-core.c index 0fea4f4ea0e..77e25a65a9b 100644 --- a/drivers/mfd/glamo/glamo-core.c +++ b/drivers/mfd/glamo/glamo-core.c @@ -526,6 +526,38 @@ 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 -- cgit v1.2.3