[PATCH] radeonfb: resume support for Samsung P35 laptops

Make resume from suspend-to-ram possible for Samsung P35 laptops.

The radeon mobility 9700 chip on Samsung P35 laptops locks up everything on
resume from suspend-to-ram if it is not reinitialized.

VGA compatible controller: ATI Technologies Inc RV350 [Mobility Radeon 9600 M10]
Class 0300: 1002:4e50
       Subsystem: 144d:c00c

Unfortunately, the DMI strings are mostly identical for all Samsung
laptops.  So we match the PCI ID and subsystem ID of the graphics card
which is unique for each Samsung laptop model.
Signed-off-by: Carl-Daniel Hailfinger <c-d.hailfinger.devel.2006@gmx.net>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

drivers/video/aty/radeon_pm.c

@@ -1321,8 +1321,6 @@ static void radeon_pm_full_reset_sdram(struct radeonfb_info *rinfo)
 	mdelay( 15);
 }
 
-#ifdef CONFIG_PPC_OF
-
 static void radeon_pm_reset_pad_ctlr_strength(struct radeonfb_info *rinfo)
 {
 	u32 tmp, tmp2;
@@ -1836,6 +1834,8 @@ static void radeon_reinitialize_M10(struct radeonfb_info *rinfo)
 	radeon_pm_m10_enable_lvds_spread_spectrum(rinfo);
 }
 
+#ifdef CONFIG_PPC_OF
+
 static void radeon_pm_m9p_reconfigure_mc(struct radeonfb_info *rinfo)
 {
 	OUTREG(MC_CNTL, rinfo->save_regs[46]);
@@ -2728,13 +2728,23 @@ void radeonfb_pm_init(struct radeonfb_info *rinfo, int dynclk)
 		printk("radeonfb: Dynamic Clock Power Management disabled\n");
 	}
 
+#if defined(CONFIG_PM)
 	/* Check if we can power manage on suspend/resume. We can do
 	 * D2 on M6, M7 and M9, and we can resume from D3 cold a few other
 	 * "Mac" cards, but that's all. We need more infos about what the
 	 * BIOS does tho. Right now, all this PM stuff is pmac-only for that
 	 * reason. --BenH
 	 */
-#if defined(CONFIG_PM) && defined(CONFIG_PPC_PMAC)
+	/* Special case for Samsung P35 laptops
+	 */
+	if ((rinfo->pdev->vendor == PCI_VENDOR_ID_ATI) &&
+	    (rinfo->pdev->device == PCI_CHIP_RV350_NP) &&
+	    (rinfo->pdev->subsystem_vendor == PCI_VENDOR_ID_SAMSUNG) &&
+	    (rinfo->pdev->subsystem_device == 0xc00c)) {
+		rinfo->reinit_func = radeon_reinitialize_M10;
+		rinfo->pm_mode |= radeon_pm_off;
+	}
+#if defined(CONFIG_PPC_PMAC)
 	if (_machine == _MACH_Pmac && rinfo->of_node) {
 		if (rinfo->is_mobility && rinfo->pm_reg &&
 		    rinfo->family <= CHIP_FAMILY_RV250)
@@ -2778,7 +2788,8 @@ void radeonfb_pm_init(struct radeonfb_info *rinfo, int dynclk)
 		OUTREG(TV_DAC_CNTL, INREG(TV_DAC_CNTL) | 0x07000000);
 #endif
 	}
-#endif /* defined(CONFIG_PM) && defined(CONFIG_PPC_PMAC) */
+#endif /* defined(CONFIG_PPC_PMAC) */
+#endif /* defined(CONFIG_PM) */
 }
 
 void radeonfb_pm_exit(struct radeonfb_info *rinfo)