From mboxrd@z Thu Jan 1 00:00:00 1970 Return-path: Received: from mail.free-electrons.com ([88.190.12.23]) by canuck.infradead.org with esmtp (Exim 4.72 #1 (Red Hat Linux)) id 1PgFK3-0003Gl-3Y for barebox@lists.infradead.org; Fri, 21 Jan 2011 11:38:33 +0000 Message-ID: <4D39700F.3030707@free-electrons.com> Date: Fri, 21 Jan 2011 12:37:51 +0100 From: Gregory CLEMENT MIME-Version: 1.0 List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: barebox-bounces@lists.infradead.org Errors-To: barebox-bounces+u.kleine-koenig=pengutronix.de@lists.infradead.org Subject: [PATCH v2 1/1] fb i.MX23/28: Add the reset control of LCD To: barebox , Sascha Hauer Video controller of STM allow to control the reset bit of an external LCD controller. When reset_lcd is set, CTRL1_RESET bit is used to enable and disable LCD. Handle USE_LCD_RESET as a flag in imx_fb_platformdata. Signed-off-by: Gregory CLEMENT --- arch/arm/mach-mxs/include/mach/fb.h | 3 +++ drivers/video/stm.c | 11 +++++++++++ 2 files changed, 14 insertions(+), 0 deletions(-) diff --git a/arch/arm/mach-mxs/include/mach/fb.h b/arch/arm/mach-mxs/include/mach/fb.h index 2b61dee..2b6825f 100644 --- a/arch/arm/mach-mxs/include/mach/fb.h +++ b/arch/arm/mach-mxs/include/mach/fb.h @@ -31,6 +31,8 @@ /** swap RGB to BGR */ #define FB_SYNC_SWAP_RGB (1 << 31) +#define USE_LCD_RESET 1 + struct imx_fb_platformdata { struct fb_videomode *mode_list; unsigned mode_cnt; @@ -42,6 +44,7 @@ struct imx_fb_platformdata { void *fixed_screen; /**< if != NULL use this as framebuffer memory */ unsigned fixed_screen_size; /**< framebuffer memory size for fixed_screen */ + unsigned flags; void (*enable)(int enable); /**< hook to enable backlight */ }; diff --git a/drivers/video/stm.c b/drivers/video/stm.c index 205cad1..ee2f026 100644 --- a/drivers/video/stm.c +++ b/drivers/video/stm.c @@ -48,6 +48,7 @@ # define CTRL1_FIFO_CLEAR (1 << 21) # define SET_BYTE_PACKAGING(x) (((x) & 0xf) << 16) # define GET_BYTE_PACKAGING(x) (((x) >> 16) & 0xf) +# define CTRL1_RESET (1 << 0) #ifdef CONFIG_ARCH_IMX28 # define HW_LCDIF_CTRL2 0x20 @@ -253,6 +254,11 @@ static void stmfb_enable_controller(struct fb_info *fb_info) /* stop FIFO reset */ writel(CTRL1_FIFO_CLEAR, fbi->base + HW_LCDIF_CTRL1 + BIT_CLR); + + /* enable LCD using LCD_RESET signal*/ + if (fbi->pdata->flags & USE_LCD_RESET) + writel(CTRL1_RESET, fbi->base + HW_LCDIF_CTRL1 + BIT_SET); + /* start the engine right now */ writel(CTRL_RUN, fbi->base + HW_LCDIF_CTRL + BIT_SET); @@ -266,6 +272,11 @@ static void stmfb_disable_controller(struct fb_info *fb_info) unsigned loop; uint32_t reg; + + /* disable LCD using LCD_RESET signal*/ + if (fbi->pdata->flags & USE_LCD_RESET) + writel(CTRL1_RESET, fbi->base + HW_LCDIF_CTRL1 + BIT_CLR); + if (fbi->pdata->enable) fbi->pdata->enable(0); -- 1.7.0.4 _______________________________________________ barebox mailing list barebox@lists.infradead.org http://lists.infradead.org/mailman/listinfo/barebox