From 8f368f56f412006c19e9a98eb419603d7e178ee9 Mon Sep 17 00:00:00 2001 From: Jason Chen Date: Thu, 28 Apr 2011 11:23:36 +0800 Subject: [PATCH] ENGR00141552 ipuv3: fix display pin's power leak If you disable display, the display port's pin may keep high voltage which may cause power leakage. Fix this issue by make all pin go into low level after display disable. Signed-off-by: Jason Chen --- drivers/mxc/ipu3/ipu_disp.c | 19 +++++++++++++++++++ drivers/video/mxc/mxc_ipuv3_fb.c | 1 + include/linux/ipu.h | 2 ++ 3 files changed, 22 insertions(+) diff --git a/drivers/mxc/ipu3/ipu_disp.c b/drivers/mxc/ipu3/ipu_disp.c index f2c6beee6522..9e8d70379d36 100644 --- a/drivers/mxc/ipu3/ipu_disp.c +++ b/drivers/mxc/ipu3/ipu_disp.c @@ -1475,6 +1475,25 @@ int32_t ipu_init_sync_panel(int disp, uint32_t pixel_clk, } EXPORT_SYMBOL(ipu_init_sync_panel); +void ipu_uninit_sync_panel(int disp) +{ + unsigned long lock_flags; + uint32_t reg; + uint32_t di_gen; + + spin_lock_irqsave(&ipu_lock, lock_flags); + + di_gen = __raw_readl(DI_GENERAL(disp)); + di_gen |= 0x3ff | DI_GEN_POLARITY_DISP_CLK; + __raw_writel(di_gen, DI_GENERAL(disp)); + + reg = __raw_readl(DI_POL(disp)); + reg |= 0x3ffffff; + __raw_writel(reg, DI_POL(disp)); + + spin_unlock_irqrestore(&ipu_lock, lock_flags); +} +EXPORT_SYMBOL(ipu_uninit_sync_panel); int ipu_init_async_panel(int disp, int type, uint32_t cycle_time, uint32_t pixel_fmt, ipu_adc_sig_cfg_t sig) diff --git a/drivers/video/mxc/mxc_ipuv3_fb.c b/drivers/video/mxc/mxc_ipuv3_fb.c index 03c07b984961..1107bea05e7f 100644 --- a/drivers/video/mxc/mxc_ipuv3_fb.c +++ b/drivers/video/mxc/mxc_ipuv3_fb.c @@ -1226,6 +1226,7 @@ static int mxcfb_blank(int blank, struct fb_info *info) case FB_BLANK_HSYNC_SUSPEND: case FB_BLANK_NORMAL: ipu_disable_channel(mxc_fbi->ipu_ch, true); + ipu_uninit_sync_panel(mxc_fbi->ipu_di); ipu_uninit_channel(mxc_fbi->ipu_ch); break; case FB_BLANK_UNBLANK: diff --git a/include/linux/ipu.h b/include/linux/ipu.h index 2e2b3ceff389..768ec3de9937 100644 --- a/include/linux/ipu.h +++ b/include/linux/ipu.h @@ -956,6 +956,8 @@ int32_t ipu_init_sync_panel(int disp, uint16_t v_sync_width, uint16_t v_end_width, uint32_t v_to_h_sync, ipu_di_signal_cfg_t sig); +void ipu_uninit_sync_panel(int disp); + int32_t ipu_disp_set_window_pos(ipu_channel_t channel, int16_t x_pos, int16_t y_pos); int32_t ipu_disp_get_window_pos(ipu_channel_t channel, int16_t *x_pos, -- 2.39.5