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>

1 files changed, 17 insertions, 15 deletions

diff --git a/drivers/video/geode/video_gx.c b/drivers/video/geode/video_gx.c
index 06245a8400c..cfe2c80b025 100644
--- a/drivers/video/geode/video_gx.c
+++ b/drivers/video/geode/video_gx.c
@@ -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 */