From: Gregory CLEMENT <gregory.clement@free-electrons.com>
To: barebox <barebox@lists.infradead.org>
Subject: [PATCH 4/4] ARM STM/i.MX: Add the reset control of LCD
Date: Tue, 04 Jan 2011 15:35:44 +0100 [thread overview]
Message-ID: <4D233040.3090606@free-electrons.com> (raw)
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.
Signed-off-by: Gregory CLEMENT <gregory.clement@free-electrons.com>
---
arch/arm/mach-stm/include/mach/fb.h | 1 +
drivers/video/stm.c | 11 +++++++++++
2 files changed, 12 insertions(+), 0 deletions(-)
diff --git a/arch/arm/mach-stm/include/mach/fb.h b/arch/arm/mach-stm/include/mach/fb.h
index f899433..3d40479 100644
--- a/arch/arm/mach-stm/include/mach/fb.h
+++ b/arch/arm/mach-stm/include/mach/fb.h
@@ -39,6 +39,7 @@ struct imx_fb_videomode {
unsigned ld_intf_width; /**< refer STMLCDIF_* macros */
unsigned data_mode;
u32 bits_per_pixel;
+ unsigned reset_lcd; /** use LCD_RESET signal*/
};
#endif /* __MACH_FB_H */
diff --git a/drivers/video/stm.c b/drivers/video/stm.c
index 3dc2abe..b1bb9b3 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
@@ -271,6 +272,11 @@ 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->reset_lcd)
+ 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);
}
@@ -281,6 +287,11 @@ static void stmfb_disable_controller(struct fb_info *fb_info)
unsigned loop;
uint32_t reg;
+
+ /* disable LCD using LCD_RESET signal*/
+ if (fbi->pdata->reset_lcd)
+ writel(CTRL1_RESET, fbi->base + HW_LCDIF_CTRL1 + BIT_CLR);
+
/*
* Even if we disable the controller here, it will still continue
* until its FIFOs are running out of data
--
1.7.0.4
_______________________________________________
barebox mailing list
barebox@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/barebox
reply other threads:[~2011-01-04 14:36 UTC|newest]
Thread overview: [no followups] expand[flat|nested] mbox.gz Atom feed
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=4D233040.3090606@free-electrons.com \
--to=gregory.clement@free-electrons.com \
--cc=barebox@lists.infradead.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.