Patchwork [U-Boot,V4,3/7] lcd: calculate line_length after lcd_ctrl_init()

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Submitter Stephen Warren
Date Nov. 27, 2012, 4:38 a.m.
Message ID <1353991097-12918-3-git-send-email-swarren@wwwdotorg.org>
Download mbox | patch
Permalink /patch/202089/
State Superseded
Delegated to: Anatolij Gustschin
Headers show

Comments

Stephen Warren - Nov. 27, 2012, 4:38 a.m.
When an LCD driver is actually driving a regular external display, e.g.
an HDMI monitor, the display resolution might not be known until the
display controller has initialized, i.e. during lcd_ctrl_init(). However,
lcd.c calculates lcd_line_length before calling this function, thus
relying on a hard-coded resolution in struct panel_info.

Instead, defer this calculation until after lcd_ctrl_init() has had the
chance to dynamically determine the resolution. This needs to happen
before lcd_clear(), since the value is used there.

grep indicates that no code outside lcd.c uses this lcd_line_length; in
particular, no lcd_ctrl_init() implementations read it.

Signed-off-by: Stephen Warren <swarren@wwwdotorg.org>
Acked-by: Anatolij Gustschin <agust@denx.de>
--
v4: Rebased onto latest u-boot-arm/master; adjusted to addition of
    lcd_get_size() function.
v3: No change.
---
 common/lcd.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

Patch

diff --git a/common/lcd.c b/common/lcd.c
index 3017604..eb2f33a 100644
--- a/common/lcd.c
+++ b/common/lcd.c
@@ -384,8 +384,6 @@  int drv_lcd_init (void)
 
 	lcd_base = (void *)(gd->fb_base);
 
-	lcd_get_size(&lcd_line_length);
-
 	lcd_init(lcd_base);		/* LCD initialization */
 
 	/* Device initialization */
@@ -468,6 +466,8 @@  static int lcd_init(void *lcdbase)
 	debug("[LCD] Initializing LCD frambuffer at %p\n", lcdbase);
 
 	lcd_ctrl_init(lcdbase);
+	lcd_get_size(&lcd_line_length);
+	lcd_line_length = (panel_info.vl_col * NBITS(panel_info.vl_bpix)) / 8;
 	lcd_is_enabled = 1;
 	lcd_clear();
 	lcd_enable ();