linux-fbdev.vger.kernel.org archive mirror
 help / color / mirror / Atom feed
* [PATCH 1/2] Support overriding fields FW tells us with the DMI data.
@ 2011-03-31 14:33 Peter Jones
  2011-04-06 16:42 ` Paul Mundt
                   ` (3 more replies)
  0 siblings, 4 replies; 5+ messages in thread
From: Peter Jones @ 2011-03-31 14:33 UTC (permalink / raw)
  To: linux-fbdev

Some machines apparently give us bogus linelength/stride/pitch data, so
we need to support letting the DMI table override the supplied data.

I bet you can't guess whose machines I'm talking about.
---
 drivers/video/efifb.c |  149 +++++++++++++++++++++++++++++--------------------
 1 files changed, 88 insertions(+), 61 deletions(-)

diff --git a/drivers/video/efifb.c b/drivers/video/efifb.c
index a9645b8..2359b64 100644
--- a/drivers/video/efifb.c
+++ b/drivers/video/efifb.c
@@ -68,41 +68,48 @@ enum {
 	M_UNKNOWN	/* placeholder */
 };
 
+#define OVERRIDE_NONE	0x0
+#define OVERRIDE_BASE	0x1
+#define OVERRIDE_STRIDE	0x2
+#define OVERRIDE_HEIGHT	0x4
+#define OVERRIDE_WIDTH	0x8
+
 static struct efifb_dmi_info {
 	char *optname;
 	unsigned long base;
 	int stride;
 	int width;
 	int height;
+	int flags;
 } dmi_list[] __initdata = {
-	[M_I17] = { "i17", 0x80010000, 1472 * 4, 1440, 900 },
-	[M_I20] = { "i20", 0x80010000, 1728 * 4, 1680, 1050 }, /* guess */
-	[M_I20_SR] = { "imac7", 0x40010000, 1728 * 4, 1680, 1050 },
-	[M_I24] = { "i24", 0x80010000, 2048 * 4, 1920, 1200 }, /* guess */
-	[M_I24_8_1] = { "imac8", 0xc0060000, 2048 * 4, 1920, 1200 },
-	[M_I24_10_1] = { "imac10", 0xc0010000, 2048 * 4, 1920, 1080 },
-	[M_I27_11_1] = { "imac11", 0xc0010000, 2560 * 4, 2560, 1440 },
-	[M_MINI]= { "mini", 0x80000000, 2048 * 4, 1024, 768 },
-	[M_MINI_3_1] = { "mini31", 0x40010000, 1024 * 4, 1024, 768 },
-	[M_MINI_4_1] = { "mini41", 0xc0010000, 2048 * 4, 1920, 1200 },
-	[M_MB] = { "macbook", 0x80000000, 2048 * 4, 1280, 800 },
-	[M_MB_5_1] = { "macbook51", 0x80010000, 2048 * 4, 1280, 800 },
-	[M_MB_6_1] = { "macbook61", 0x80010000, 2048 * 4, 1280, 800 },
-	[M_MB_7_1] = { "macbook71", 0x80010000, 2048 * 4, 1280, 800 },
-	[M_MBA] = { "mba", 0x80000000, 2048 * 4, 1280, 800 },
-	[M_MBP] = { "mbp", 0x80010000, 1472 * 4, 1440, 900 },
-	[M_MBP_2] = { "mbp2", 0, 0, 0, 0 }, /* placeholder */
-	[M_MBP_2_2] = { "mbp22", 0x80010000, 1472 * 4, 1440, 900 },
-	[M_MBP_SR] = { "mbp3", 0x80030000, 2048 * 4, 1440, 900 },
-	[M_MBP_4] = { "mbp4", 0xc0060000, 2048 * 4, 1920, 1200 },
-	[M_MBP_5_1] = { "mbp51", 0xc0010000, 2048 * 4, 1440, 900 },
-	[M_MBP_5_2] = { "mbp52", 0xc0010000, 2048 * 4, 1920, 1200 },
-	[M_MBP_5_3] = { "mbp53", 0xd0010000, 2048 * 4, 1440, 900 },
-	[M_MBP_6_1] = { "mbp61", 0x90030000, 2048 * 4, 1920, 1200 },
-	[M_MBP_6_2] = { "mbp62", 0x90030000, 2048 * 4, 1680, 1050 },
-	[M_MBP_7_1] = { "mbp71", 0xc0010000, 2048 * 4, 1280, 800 },
-	[M_MBP_8_2] = { "mbp82", 0x90010000, 1472 * 4, 1440, 900 },
-	[M_UNKNOWN] = { NULL, 0, 0, 0, 0 }
+	[M_I17] = { "i17", 0x80010000, 1472 * 4, 1440, 900, OVERRIDE_NONE },
+	[M_I20] = { "i20", 0x80010000, 1728 * 4, 1680, 1050, OVERRIDE_NONE }, /* guess */
+	[M_I20_SR] = { "imac7", 0x40010000, 1728 * 4, 1680, 1050, OVERRIDE_NONE },
+	[M_I24] = { "i24", 0x80010000, 2048 * 4, 1920, 1200, OVERRIDE_NONE }, /* guess */
+	[M_I24_8_1] = { "imac8", 0xc0060000, 2048 * 4, 1920, 1200, OVERRIDE_NONE },
+	[M_I24_10_1] = { "imac10", 0xc0010000, 2048 * 4, 1920, 1080, OVERRIDE_NONE },
+	[M_I27_11_1] = { "imac11", 0xc0010000, 2560 * 4, 2560, 1440, OVERRIDE_NONE },
+	[M_MINI]= { "mini", 0x80000000, 2048 * 4, 1024, 768, OVERRIDE_NONE },
+	[M_MINI_3_1] = { "mini31", 0x40010000, 1024 * 4, 1024, 768, OVERRIDE_NONE },
+	[M_MINI_4_1] = { "mini41", 0xc0010000, 2048 * 4, 1920, 1200, OVERRIDE_NONE },
+	[M_MB] = { "macbook", 0x80000000, 2048 * 4, 1280, 800, OVERRIDE_NONE },
+	[M_MB_5_1] = { "macbook51", 0x80010000, 2048 * 4, 1280, 800, OVERRIDE_NONE },
+	[M_MB_6_1] = { "macbook61", 0x80010000, 2048 * 4, 1280, 800, OVERRIDE_NONE },
+	[M_MB_7_1] = { "macbook71", 0x80010000, 2048 * 4, 1280, 800, OVERRIDE_NONE },
+	[M_MBA] = { "mba", 0x80000000, 2048 * 4, 1280, 800, OVERRIDE_NONE },
+	[M_MBP] = { "mbp", 0x80010000, 1472 * 4, 1440, 900, OVERRIDE_NONE },
+	[M_MBP_2] = { "mbp2", 0, 0, 0, 0, OVERRIDE_NONE }, /* placeholder */
+	[M_MBP_2_2] = { "mbp22", 0x80010000, 1472 * 4, 1440, 900, OVERRIDE_NONE },
+	[M_MBP_SR] = { "mbp3", 0x80030000, 2048 * 4, 1440, 900, OVERRIDE_NONE },
+	[M_MBP_4] = { "mbp4", 0xc0060000, 2048 * 4, 1920, 1200, OVERRIDE_NONE },
+	[M_MBP_5_1] = { "mbp51", 0xc0010000, 2048 * 4, 1440, 900, OVERRIDE_NONE },
+	[M_MBP_5_2] = { "mbp52", 0xc0010000, 2048 * 4, 1920, 1200, OVERRIDE_NONE },
+	[M_MBP_5_3] = { "mbp53", 0xd0010000, 2048 * 4, 1440, 900, OVERRIDE_NONE },
+	[M_MBP_6_1] = { "mbp61", 0x90030000, 2048 * 4, 1920, 1200, OVERRIDE_NONE },
+	[M_MBP_6_2] = { "mbp62", 0x90030000, 2048 * 4, 1680, 1050, OVERRIDE_NONE },
+	[M_MBP_7_1] = { "mbp71", 0xc0010000, 2048 * 4, 1280, 800, OVERRIDE_NONE },
+	[M_MBP_8_2] = { "mbp82", 0x90010000, 1472 * 4, 1440, 900, OVERRIDE_NONE },
+	[M_UNKNOWN] = { NULL, 0, 0, 0, 0, OVERRIDE_NONE }
 };
 
 static int set_system(const struct dmi_system_id *id);
@@ -157,16 +164,22 @@ static const struct dmi_system_id dmi_system_table[] __initconst = {
 	{},
 };
 
+#define choose_value(dmivalue, fwvalue, field, flags) ({	\
+		typeof(fwvalue) _ret_ = fwvalue;		\
+		if ((flags) & (field))				\
+			_ret_ = dmivalue;			\
+		else if ((fwvalue) = 0)			\
+			_ret_ = dmivalue;			\
+		_ret_;						\
+	})
+
 static int set_system(const struct dmi_system_id *id)
 {
 	struct efifb_dmi_info *info = id->driver_data;
-	if (info->base = 0)
-		return 0;
 
-	printk(KERN_INFO "efifb: dmi detected %s - framebuffer at %p "
-			 "(%dx%d, stride %d)\n", id->ident,
-			 (void *)info->base, info->width, info->height,
-			 info->stride);
+	if (info->base = 0 && info->height = 0 && info->width = 0
+			&& info->stride = 0)
+		return 0;
 
 	/* Trust the bootloader over the DMI tables */
 	if (screen_info.lfb_base = 0) {
@@ -174,40 +187,47 @@ static int set_system(const struct dmi_system_id *id)
 		struct pci_dev *dev = NULL;
 		int found_bar = 0;
 #endif
-		screen_info.lfb_base = info->base;
+		if (info->base) {
+			screen_info.lfb_base = choose_value(info->base,
+				screen_info.lfb_base, OVERRIDE_BASE,
+				info->flags);
 
 #if defined(CONFIG_PCI)
-		/* make sure that the address in the table is actually on a
-		 * VGA device's PCI BAR */
-
-		for_each_pci_dev(dev) {
-			int i;
-			if ((dev->class >> 8) != PCI_CLASS_DISPLAY_VGA)
-				continue;
-			for (i = 0; i < DEVICE_COUNT_RESOURCE; i++) {
-				resource_size_t start, end;
-
-				start = pci_resource_start(dev, i);
-				if (start = 0)
-					break;
-				end = pci_resource_end(dev, i);
-				if (screen_info.lfb_base >= start &&
-						screen_info.lfb_base < end) {
-					found_bar = 1;
+			/* make sure that the address in the table is actually
+			 * on a VGA device's PCI BAR */
+
+			for_each_pci_dev(dev) {
+				int i;
+				if ((dev->class >> 8) != PCI_CLASS_DISPLAY_VGA)
+					continue;
+				for (i = 0; i < DEVICE_COUNT_RESOURCE; i++) {
+					resource_size_t start, end;
+
+					start = pci_resource_start(dev, i);
+					if (start = 0)
+						break;
+					end = pci_resource_end(dev, i);
+					if (screen_info.lfb_base >= start &&
+					    screen_info.lfb_base < end) {
+						found_bar = 1;
+					}
 				}
 			}
-		}
-		if (!found_bar)
-			screen_info.lfb_base = 0;
+			if (!found_bar)
+				screen_info.lfb_base = 0;
 #endif
+		}
 	}
 	if (screen_info.lfb_base) {
-		if (screen_info.lfb_linelength = 0)
-			screen_info.lfb_linelength = info->stride;
-		if (screen_info.lfb_width = 0)
-			screen_info.lfb_width = info->width;
-		if (screen_info.lfb_height = 0)
-			screen_info.lfb_height = info->height;
+		screen_info.lfb_linelength = choose_value(info->stride,
+			screen_info.lfb_linelength, OVERRIDE_STRIDE,
+			info->flags);
+		screen_info.lfb_width = choose_value(info->width,
+			screen_info.lfb_width, OVERRIDE_WIDTH,
+			info->flags);
+		screen_info.lfb_height = choose_value(info->height,
+			screen_info.lfb_height, OVERRIDE_HEIGHT,
+			info->flags);
 		if (screen_info.orig_video_isVGA = 0)
 			screen_info.orig_video_isVGA = VIDEO_TYPE_EFI;
 	} else {
@@ -217,6 +237,13 @@ static int set_system(const struct dmi_system_id *id)
 		screen_info.orig_video_isVGA = 0;
 		return 0;
 	}
+
+	printk(KERN_INFO "efifb: dmi detected %s - framebuffer at %p "
+			 "(%dx%d, stride %d)\n", id->ident,
+			 (void *)screen_info.lfb_base, screen_info.lfb_width,
+			 screen_info.lfb_height, screen_info.lfb_linelength);
+
+
 	return 1;
 }
 
-- 
1.7.4


^ permalink raw reply related	[flat|nested] 5+ messages in thread
end of thread, other threads:[~2011-04-06 17:59 UTC | newest]

Thread overview: 5+ messages (download: mbox.gz follow: Atom feed
-- links below jump to the message on this page --
2011-03-31 14:33 [PATCH 1/2] Support overriding fields FW tells us with the DMI data Peter Jones
2011-04-06 16:42 ` Paul Mundt
2011-04-06 17:31 ` [PATCH 1/2] Support overriding fields FW tells us with the DMI Peter Jones
2011-04-06 17:34 ` [PATCH 1/2] Support overriding fields FW tells us with the DMI data Peter Jones
2011-04-06 17:59 ` Paul Mundt

This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).