linux-kernel - [PATCH 2/4] radeonfb: add new module parameter to force PLL calculation

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Date:	Tue, 4 Sep 2007 12:59:08 +0200
From:	aherrman@...or.de
To:	benh@...nel.crashing.org, linux-fbdev-devel@...ts.sourceforge.net,
	linux-kernel@...r.kernel.org
Subject: [PATCH 2/4] radeonfb: add new module parameter to force PLL calculation

On my Acer Aspire 5100 (with 0x5975) I need to force PLL caclulation.
Most probably the BIOS dividers are incorrect/insufficient. Without pll
calculation console goes blank.

Signed-off-by: Andreas Herrmann <aherrman@...or.de>
---
 drivers/video/aty/radeon_base.c |    7 ++++++-
 1 files changed, 6 insertions(+), 1 deletions(-)

diff --git a/drivers/video/aty/radeon_base.c b/drivers/video/aty/radeon_base.c
index 90a3957..f672c0c 100644
--- a/drivers/video/aty/radeon_base.c
+++ b/drivers/video/aty/radeon_base.c
@@ -268,6 +268,7 @@ static int mirror = 0;
 static int panel_yres = 0;
 static int force_dfp = 0;
 static int force_measure_pll = 0;
+static int force_pll_calc = 0;
 #ifdef CONFIG_MTRR
 static int nomtrr = 0;
 #endif
@@ -1590,7 +1591,7 @@ static int radeonfb_set_par(struct fb_info *info)
 
 		pixClock = 100000000 / rinfo->panel_info.clock;
 
-		if (rinfo->panel_info.use_bios_dividers) {
+		if (rinfo->panel_info.use_bios_dividers && !force_pll_calc) {
 			nopllcalc = 1;
 			newmode->ppll_div_3 = rinfo->panel_info.fbk_divider |
 				(rinfo->panel_info.post_divider << 16);
@@ -2495,6 +2496,8 @@ static int __init radeonfb_setup (char *options)
 			nomodeset = 1;
 		} else if (!strncmp(this_opt, "force_measure_pll", 17)) {
 			force_measure_pll = 1;
+		} else if (!strncmp(this_opt, "force_pll_calc", 17)) {
+			force_pll_calc = 1;
 		} else if (!strncmp(this_opt, "ignore_edid", 11)) {
 			ignore_edid = 1;
 #if defined(CONFIG_PM) && defined(CONFIG_X86)
@@ -2550,6 +2553,8 @@ module_param(monitor_layout, charp, 0);
 MODULE_PARM_DESC(monitor_layout, "Specify monitor mapping (like XFree86)");
 module_param(force_measure_pll, bool, 0);
 MODULE_PARM_DESC(force_measure_pll, "Force measurement of PLL (debug)");
+module_param(force_pll_calc, bool, 0400);
+MODULE_PARM_DESC(force_pll_calc, "Force calculation of PLL");
 #ifdef CONFIG_MTRR
 module_param(nomtrr, bool, 0);
 MODULE_PARM_DESC(nomtrr, "bool: disable use of MTRR registers");
-- 
1.5.3


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