diff options
Diffstat (limited to 'target/linux/s3c24xx/patches-2.6.24/1299-glamo_fb-Implement-screen-blanking.patch')
| -rw-r--r-- | target/linux/s3c24xx/patches-2.6.24/1299-glamo_fb-Implement-screen-blanking.patch | 128 |
1 files changed, 128 insertions, 0 deletions
diff --git a/target/linux/s3c24xx/patches-2.6.24/1299-glamo_fb-Implement-screen-blanking.patch b/target/linux/s3c24xx/patches-2.6.24/1299-glamo_fb-Implement-screen-blanking.patch new file mode 100644 index 0000000000..3004a832ef --- /dev/null +++ b/target/linux/s3c24xx/patches-2.6.24/1299-glamo_fb-Implement-screen-blanking.patch @@ -0,0 +1,128 @@ +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 + |