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gxfb: don't enable the CRT DACs when we are in flatpanel mode 

When the FP strap is enabled, don't turn on the CRT DACs - that will save
about 35 mA of power.

Updated/cleaned up by Andres Salomon.

Signed-off-by: Andres Salomon <dilinger@debian.org>
Signed-off-by: Jordan Crouse <jordan.crouse@amd.com>
Cc: "Antonino A. Daplas" <adaplas@pol.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Jordan Crouse 2008-04-28 02:14:56 -07:00 committed by Linus Torvalds
parent f0a0c1f20f
commit e2b1180909
1 changed files with 17 additions and 15 deletions
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32
drivers/video/geode/video_gx.c
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@ -239,18 +239,6 @@ static void gx_configure_display(struct fb_info *info)
struct geodefb_par *par = info->par;
u32 dcfg, misc;
/* Set up the MISC register */
misc = readl(par->vid_regs + GX_MISC);
/* Power up the DAC */
misc &= ~(GX_MISC_A_PWRDN | GX_MISC_DAC_PWRDN);
/* Disable gamma correction */
misc |= GX_MISC_GAM_EN;
writel(misc, par->vid_regs + GX_MISC);
/* Write the display configuration */
dcfg = readl(par->vid_regs + GX_DCFG);
@ -269,14 +257,28 @@ static void gx_configure_display(struct fb_info *info)
/* Enable hsync and vsync. */
dcfg |= GX_DCFG_HSYNC_EN | GX_DCFG_VSYNC_EN;
/* Only change the sync polarities if we are running
* in CRT mode. The FP polarities will be handled in
* gxfb_configure_tft */
misc = readl(par->vid_regs + GX_MISC);
/* Disable gamma correction */
misc |= GX_MISC_GAM_EN;
if (par->enable_crt) {
/* Power up the CRT DACs */
misc &= ~(GX_MISC_A_PWRDN | GX_MISC_DAC_PWRDN);
writel(misc, par->vid_regs + GX_MISC);
/* Only change the sync polarities if we are running
* in CRT mode. The FP polarities will be handled in
* gxfb_configure_tft */
if (!(info->var.sync & FB_SYNC_HOR_HIGH_ACT))
dcfg |= GX_DCFG_CRT_HSYNC_POL;
if (!(info->var.sync & FB_SYNC_VERT_HIGH_ACT))
dcfg |= GX_DCFG_CRT_VSYNC_POL;
} else {
/* Power down the CRT DACs if in FP mode */
misc |= (GX_MISC_A_PWRDN | GX_MISC_DAC_PWRDN);
writel(misc, par->vid_regs + GX_MISC);
}
/* Enable the display logic */