Attachment 120331 Details for Bug 93246 – A new function called VIASetDFPBackLight was added

A new function called VIASetDFPBackLight was added

0010-Added-a-new-function-called-VIASetDFPBackLight-to-vi.patch (text/plain), 2.60 KB, created by Kevin Brace on 2015-12-04 08:11:16 UTC

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Creator: Kevin Brace

Created: 2015-12-04 08:11:16 UTC

Size: 2.60 KB

patch

obsolete

>From 6aa09171f55bdc2f10b20d3565af26b068579737 Mon Sep 17 00:00:00 2001
>From: Kevin Brace <kevinbrace@gmx.com>
>Date: Thu, 3 Dec 2015 23:13:51 -0800
>Subject: [PATCH 10/10] Added a new function called VIASetDFPBackLight to
> via_lvds.c. This function turns the DFP (Digital Flat
> Panel) back light on or off. Previously, DFP back
> light was not being turned off when the computer
> turns the screen off, leading to unnecessary
> consumption of power. This improvement is especially
> helpful in a mobile environment where conserving
> power is key to extending battery life.      The
> compiled device driver was tested on the following
> computer.
>
> - Epic 1314 laptop (MSI VR321 laptop equivalent, VN896 chipset)
>   with Lubuntu 12.04 i386
>---
> src/via_lvds.c |   31 +++++++++++++++++++++++++++++--
> 1 file changed, 29 insertions(+), 2 deletions(-)
>
>diff --git a/src/via_lvds.c b/src/via_lvds.c
>index ed5bd79..fbb2299 100644
>--- a/src/via_lvds.c
>+++ b/src/via_lvds.c
>@@ -386,12 +386,35 @@ ViaLCDPower(xf86OutputPtr output, Bool On)
>     usleep(1);
> }
> 
>-static void
>-via_lvds_dpms(xf86OutputPtr output, int mode)
>+static void VIASetDFPBackLight(ScrnInfoPtr pScrn, Bool on)
>+{
>+
>+    vgaHWPtr hwp = VGAHWPTR(pScrn);
>+
>+    DEBUG(xf86DrvMsg(pScrn->scrnIndex, X_INFO, "Entered VIASetDFPBackLight.\n"));
>+
>+    if (on) {
>+
>+/* Turn on LVDS-based DFP back light. */
>+        ViaCrtcMask(hwp, 0xd3, 0x00, 0x40);
>+
>+    } else {
>+
>+/* Turn off LVDS-based DFP back light. */
>+        ViaCrtcMask(hwp, 0xd3, 0x40, 0x40);
>+
>+    }
>+
>+    DEBUG(xf86DrvMsg(pScrn->scrnIndex, X_INFO, "Exiting VIASetDFPBackLight.\n"));
>+}
>+
>+static void via_lvds_dpms(xf86OutputPtr output, int mode)
> {
>     ScrnInfoPtr pScrn = output->scrn;
>     VIAPtr pVia = VIAPTR(pScrn);
> 
>+    DEBUG(xf86DrvMsg(pScrn->scrnIndex, X_INFO, "Entered via_lvds_dpms.\n"));
>+
>     if (pVia->pVbe) {
>         ViaVbePanelPower(pVia->pVbe, (mode == DPMSModeOn));
>     } else {
>@@ -404,6 +427,7 @@ via_lvds_dpms(xf86OutputPtr output, int mode)
>             case VIA_VX855:
>             case VIA_VX900:
>                 ViaLVDSPower(pScrn, TRUE);
>+                VIASetDFPBackLight(pScrn, TRUE);
>                 break;
>             }
>             ViaLCDPower(output, TRUE);
>@@ -419,12 +443,15 @@ via_lvds_dpms(xf86OutputPtr output, int mode)
>             case VIA_VX855:
>             case VIA_VX900:
>                 ViaLVDSPower(pScrn, FALSE);
>+                VIASetDFPBackLight(pScrn, FALSE);
>                 break;
>             }
>             ViaLCDPower(output, FALSE);
>             break;
>         }
>     }
>+
>+    DEBUG(xf86DrvMsg(pScrn->scrnIndex, X_INFO, "Exiting via_lvds_dpm.\n"));
> }
> 
> static void
>-- 
>1.7.9.5
>

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