[PATCH] nvidiafb: Fix mode setting & PPC support

This patch fixes nvifiafb mode setting code to be closer to what the X
driver does, which actually makes it work on the 5200FX I have access to.
It also fix the routine that gets the EDID from Open Firmware on PPC, it
was broken in various ways and would crash at boot.  Compared to the patch
I posted to linux-fbdev last week, this one just changes a printk to be
closer to the other ones in the driver.

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: "Antonino A. Daplas" <adaplas@hotpop.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

drivers/video/Kconfig

@@ -703,7 +703,7 @@ config FB_NVIDIA
 
 config FB_NVIDIA_I2C
        bool "Enable DDC Support"
-       depends on FB_NVIDIA && !PPC_OF
+       depends on FB_NVIDIA
        help
 	  This enables I2C support for nVidia Chipsets.  This is used
 	  only for getting EDID information from the attached display

drivers/video/nvidia/nv_of.c

@@ -27,34 +27,60 @@
 #include "nv_local.h"
 #include "nv_proto.h"
 
-void nvidia_create_i2c_busses(struct nvidia_par *par) {}
-void nvidia_delete_i2c_busses(struct nvidia_par *par) {}
+#include "../edid.h"
 
-int nvidia_probe_i2c_connector(struct fb_info *info, int conn, u8 **out_edid)
+int nvidia_probe_of_connector(struct fb_info *info, int conn, u8 **out_edid)
 {
 	struct nvidia_par *par = info->par;
-	struct device_node *dp;
+	struct device_node *parent, *dp;
 	unsigned char *pedid = NULL;
-	unsigned char *disptype = NULL;
 	static char *propnames[] = {
-		"DFP,EDID", "LCD,EDID", "EDID", "EDID1", "EDID,B", "EDID,A", NULL };
+		"DFP,EDID", "LCD,EDID", "EDID", "EDID1",
+		"EDID,B", "EDID,A", NULL };
 	int i;
 
-	dp = pci_device_to_OF_node(par->pci_dev);
-	for (; dp != NULL; dp = dp->child) {
-		disptype = (unsigned char *)get_property(dp, "display-type", NULL);
-		if (disptype == NULL)
-			continue;
-		if (strncmp(disptype, "LCD", 3) != 0)
-			continue;
+	parent = pci_device_to_OF_node(par->pci_dev);
+	if (parent == NULL)
+		return -1;
+	if (par->twoHeads) {
+		char *pname;
+		int len;
+
+		for (dp = NULL;
+		     (dp = of_get_next_child(parent, dp)) != NULL;) {
+			pname = (char *)get_property(dp, "name", NULL);
+			if (!pname)
+				continue;
+			len = strlen(pname);
+			if ((pname[len-1] == 'A' && conn == 1) ||
+			    (pname[len-1] == 'B' && conn == 2)) {
+				for (i = 0; propnames[i] != NULL; ++i) {
+					pedid = (unsigned char *)
+						get_property(dp, propnames[i],
+							     NULL);
+					if (pedid != NULL)
+						break;
+				}
+				of_node_put(dp);
+				break;
+			}
+		}
+	}
+	if (pedid == NULL) {
 		for (i = 0; propnames[i] != NULL; ++i) {
 			pedid = (unsigned char *)
-				get_property(dp, propnames[i], NULL);
-			if (pedid != NULL) {
-				*out_edid = pedid;
-				return 0;
-			}
+				get_property(parent, propnames[i], NULL);
+			if (pedid != NULL)
+				break;
 		}
 	}
-	return 1;
+	if (pedid) {
+		*out_edid = kmalloc(EDID_LENGTH, GFP_KERNEL);
+		if (*out_edid == NULL)
+			return -1;
+		memcpy(*out_edid, pedid, EDID_LENGTH);
+		printk(KERN_DEBUG "nvidiafb: Found OF EDID for head %d\n", conn);
+		return 0;
+	}
+	return -1;
 }

drivers/video/nvidia/nv_proto.h

@@ -31,7 +31,7 @@ int NVShowHideCursor(struct nvidia_par *par, int);
 void NVLockUnlock(struct nvidia_par *par, int);
 
 /* in nvidia-i2c.c */
-#if defined(CONFIG_FB_NVIDIA_I2C) || defined (CONFIG_PPC_OF)
+#ifdef CONFIG_FB_NVIDIA_I2C
 void nvidia_create_i2c_busses(struct nvidia_par *par);
 void nvidia_delete_i2c_busses(struct nvidia_par *par);
 int nvidia_probe_i2c_connector(struct fb_info *info, int conn,
@@ -39,10 +39,14 @@ int nvidia_probe_i2c_connector(struct fb_info *info, int conn,
 #else
 #define nvidia_create_i2c_busses(...)
 #define nvidia_delete_i2c_busses(...)
-#define nvidia_probe_i2c_connector(p, c, edid) \
-do {                                           \
-	*(edid) = NULL;                        \
-} while(0)
+#define nvidia_probe_i2c_connector(p, c, edid) (-1)
+#endif
+
+#ifdef CONFIG_FB_OF
+int nvidia_probe_of_connector(struct fb_info *info, int conn,
+			      u8 ** out_edid);
+#else
+#define nvidia_probe_of_connector(p, c, edid)  (-1)
 #endif
 
 /* in nv_accel.c */

drivers/video/nvidia/nv_setup.c

@@ -190,9 +190,9 @@ static int NVIsConnected(struct nvidia_par *par, int output)
 	present = (NV_RD32(PRAMDAC, 0x0608) & (1 << 28)) ? 1 : 0;
 
 	if (present)
-		printk("nvidiafb: CRTC%i found\n", output);
+		printk("nvidiafb: CRTC%i analog found\n", output);
 	else
-		printk("nvidiafb: CRTC%i not found\n", output);
+		printk("nvidiafb: CRTC%i analog not found\n", output);
 
 	NV_WR32(par->PRAMDAC0, 0x0608, NV_RD32(par->PRAMDAC0, 0x0608) &
 		0x0000EFFF);
@@ -305,6 +305,9 @@ void NVCommonSetup(struct fb_info *info)
 	int FlatPanel = -1;	/* really means the CRTC is slaved */
 	int Television = 0;
 
+	memset(&monitorA, 0, sizeof(struct fb_monspecs));
+	memset(&monitorB, 0, sizeof(struct fb_monspecs));
+
 	par->PRAMIN = par->REGS + (0x00710000 / 4);
 	par->PCRTC0 = par->REGS + (0x00600000 / 4);
 	par->PRAMDAC0 = par->REGS + (0x00680000 / 4);
@@ -401,7 +404,8 @@ void NVCommonSetup(struct fb_info *info)
 	nvidia_create_i2c_busses(par);
 	if (!par->twoHeads) {
 		par->CRTCnumber = 0;
-		nvidia_probe_i2c_connector(info, 1, &edidA);
+		if (nvidia_probe_i2c_connector(info, 1, &edidA))
+			nvidia_probe_of_connector(info, 1, &edidA);
 		if (edidA && !fb_parse_edid(edidA, &var)) {
 			printk("nvidiafb: EDID found from BUS1\n");
 			monA = &monitorA;
@@ -488,14 +492,16 @@ void NVCommonSetup(struct fb_info *info)
 		oldhead = NV_RD32(par->PCRTC0, 0x00000860);
 		NV_WR32(par->PCRTC0, 0x00000860, oldhead | 0x00000010);
 
-		nvidia_probe_i2c_connector(info, 1, &edidA);
+		if (nvidia_probe_i2c_connector(info, 1, &edidA))
+			nvidia_probe_of_connector(info, 1, &edidA);
 		if (edidA && !fb_parse_edid(edidA, &var)) {
 			printk("nvidiafb: EDID found from BUS1\n");
 			monA = &monitorA;
 			fb_edid_to_monspecs(edidA, monA);
 		}
 
-		nvidia_probe_i2c_connector(info, 2, &edidB);
+		if (nvidia_probe_i2c_connector(info, 2, &edidB))
+			nvidia_probe_of_connector(info, 2, &edidB);
 		if (edidB && !fb_parse_edid(edidB, &var)) {
 			printk("nvidiafb: EDID found from BUS2\n");
 			monB = &monitorB;

drivers/video/nvidia/nvidia.c

@@ -627,41 +627,85 @@ static void nvidia_save_vga(struct nvidia_par *par,
 	NVTRACE_LEAVE();
 }
 
+#undef DUMP_REG
+
 static void nvidia_write_regs(struct nvidia_par *par)
 {
 	struct _riva_hw_state *state = &par->ModeReg;
 	int i;
 
 	NVTRACE_ENTER();
-	NVWriteCrtc(par, 0x11, 0x00);
-
-	NVLockUnlock(par, 0);
 
 	NVLoadStateExt(par, state);
 
 	NVWriteMiscOut(par, state->misc_output);
 
+	for (i = 1; i < NUM_SEQ_REGS; i++) {
+#ifdef DUMP_REG
+		printk(" SEQ[%02x] = %08x\n", i, state->seq[i]);
+#endif
+		NVWriteSeq(par, i, state->seq[i]);
+	}
+
+	/* Ensure CRTC registers 0-7 are unlocked by clearing bit 7 of CRTC[17] */
+	NVWriteCrtc(par, 0x11, state->crtc[0x11] & ~0x80);
+
 	for (i = 0; i < NUM_CRT_REGS; i++) {
 		switch (i) {
 		case 0x19:
 		case 0x20 ... 0x40:
 			break;
 		default:
+#ifdef DUMP_REG
+			printk("CRTC[%02x] = %08x\n", i, state->crtc[i]);
+#endif
 			NVWriteCrtc(par, i, state->crtc[i]);
 		}
 	}
 
-	for (i = 0; i < NUM_ATC_REGS; i++)
-		NVWriteAttr(par, i, state->attr[i]);
-
-	for (i = 0; i < NUM_GRC_REGS; i++)
+	for (i = 0; i < NUM_GRC_REGS; i++) {
+#ifdef DUMP_REG
+		printk(" GRA[%02x] = %08x\n", i, state->gra[i]);
+#endif
 		NVWriteGr(par, i, state->gra[i]);
+	}
+
+	for (i = 0; i < NUM_ATC_REGS; i++) {
+#ifdef DUMP_REG
+		printk("ATTR[%02x] = %08x\n", i, state->attr[i]);
+#endif
+		NVWriteAttr(par, i, state->attr[i]);
+	}
 
-	for (i = 0; i < NUM_SEQ_REGS; i++)
-		NVWriteSeq(par, i, state->seq[i]);
 	NVTRACE_LEAVE();
 }
 
+static void nvidia_vga_protect(struct nvidia_par *par, int on)
+{
+	unsigned char tmp;
+
+	if (on) {
+		/*
+		 * Turn off screen and disable sequencer.
+		 */
+		tmp = NVReadSeq(par, 0x01);
+
+		NVWriteSeq(par, 0x00, 0x01);		/* Synchronous Reset */
+		NVWriteSeq(par, 0x01, tmp | 0x20);	/* disable the display */
+	} else {
+		/*
+		 * Reenable sequencer, then turn on screen.
+		 */
+
+		tmp = NVReadSeq(par, 0x01);
+
+		NVWriteSeq(par, 0x01, tmp & ~0x20);	/* reenable display */
+		NVWriteSeq(par, 0x00, 0x03);		/* End Reset */
+	}
+}
+
+
+
 static int nvidia_calc_regs(struct fb_info *info)
 {
 	struct nvidia_par *par = info->par;
@@ -868,7 +912,7 @@ static void nvidia_init_vga(struct fb_info *info)
 	for (i = 0; i < 0x10; i++)
 		state->attr[i] = i;
 	state->attr[0x10] = 0x41;
-	state->attr[0x11] = 0x01;
+	state->attr[0x11] = 0xff;
 	state->attr[0x12] = 0x0f;
 	state->attr[0x13] = 0x00;
 	state->attr[0x14] = 0x00;
@@ -991,7 +1035,6 @@ static int nvidiafb_set_par(struct fb_info *info)
 
 	nvidia_init_vga(info);
 	nvidia_calc_regs(info);
-	nvidia_write_regs(par);
 
 	NVLockUnlock(par, 0);
 	if (par->twoHeads) {
@@ -1000,7 +1043,22 @@ static int nvidiafb_set_par(struct fb_info *info)
 		NVLockUnlock(par, 0);
 	}
 
-	NVWriteCrtc(par, 0x11, 0x00);
+	nvidia_vga_protect(par, 1);
+
+	nvidia_write_regs(par);
+
+#if defined (__BIG_ENDIAN)
+	/* turn on LFB swapping */
+	{
+		unsigned char tmp;
+
+		VGA_WR08(par->PCIO, 0x3d4, 0x46);
+		tmp = VGA_RD08(par->PCIO, 0x3d5);
+		tmp |= (1 << 7);
+		VGA_WR08(par->PCIO, 0x3d5, tmp);
+    }
+#endif
+
 	info->fix.line_length = (info->var.xres_virtual *
 				 info->var.bits_per_pixel) >> 3;
 	if (info->var.accel_flags) {
@@ -1022,7 +1080,7 @@ static int nvidiafb_set_par(struct fb_info *info)
 
 	par->cursor_reset = 1;
 
-	NVWriteCrtc(par, 0x11, 0xff);
+	nvidia_vga_protect(par, 0);
 
 	NVTRACE_LEAVE();
 	return 0;