[VIDEO] ffb: Fix two DAC handling bugs.
The determination of whether the DAC has inverted cursor logic is
broken, import the version checks the X.org driver uses to fix this.
Next, when we change the timing generator, borrow code from X.org that
does 10 NOP reads of the timing generator register afterwards to make
sure the video-enable transition occurs cleanly.
Finally, use macros for the DAC registers and fields in order to
provide documentation for the next person who reads this code.
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/drivers/video/ffb.c b/drivers/video/ffb.c
index 15854ae..1d4e835 100644
--- a/drivers/video/ffb.c
+++ b/drivers/video/ffb.c
@@ -336,14 +336,30 @@
u32 value2;
};
+#define FFB_DAC_UCTRL 0x1001 /* User Control */
+#define FFB_DAC_UCTRL_MANREV 0x00000f00 /* 4-bit Manufacturing Revision */
+#define FFB_DAC_UCTRL_MANREV_SHIFT 8
+#define FFB_DAC_TGEN 0x6000 /* Timing Generator */
+#define FFB_DAC_TGEN_VIDE 0x00000001 /* Video Enable */
+#define FFB_DAC_DID 0x8000 /* Device Identification */
+#define FFB_DAC_DID_PNUM 0x0ffff000 /* Device Part Number */
+#define FFB_DAC_DID_PNUM_SHIFT 12
+#define FFB_DAC_DID_REV 0xf0000000 /* Device Revision */
+#define FFB_DAC_DID_REV_SHIFT 28
+
+#define FFB_DAC_CUR_CTRL 0x100
+#define FFB_DAC_CUR_CTRL_P0 0x00000001
+#define FFB_DAC_CUR_CTRL_P1 0x00000002
+
struct ffb_par {
spinlock_t lock;
struct ffb_fbc __iomem *fbc;
struct ffb_dac __iomem *dac;
u32 flags;
-#define FFB_FLAG_AFB 0x00000001
-#define FFB_FLAG_BLANKED 0x00000002
+#define FFB_FLAG_AFB 0x00000001 /* AFB m3 or m6 */
+#define FFB_FLAG_BLANKED 0x00000002 /* screen is blanked */
+#define FFB_FLAG_INVCURSOR 0x00000004 /* DAC has inverted cursor logic */
u32 fg_cache __attribute__((aligned (8)));
u32 bg_cache;
@@ -354,7 +370,6 @@
unsigned long physbase;
unsigned long fbsize;
- int dac_rev;
int board_type;
};
@@ -426,11 +441,12 @@
FFBWait(par);
/* Disable cursor. */
- upa_writel(0x100, &dac->type2);
- if (par->dac_rev <= 2)
+ upa_writel(FFB_DAC_CUR_CTRL, &dac->type2);
+ if (par->flags & FFB_FLAG_INVCURSOR)
upa_writel(0, &dac->value2);
else
- upa_writel(3, &dac->value2);
+ upa_writel((FFB_DAC_CUR_CTRL_P0 |
+ FFB_DAC_CUR_CTRL_P1), &dac->value2);
spin_unlock_irqrestore(&par->lock, flags);
}
@@ -664,18 +680,18 @@
struct ffb_par *par = (struct ffb_par *) info->par;
struct ffb_dac __iomem *dac = par->dac;
unsigned long flags;
- u32 tmp;
+ u32 val;
+ int i;
spin_lock_irqsave(&par->lock, flags);
FFBWait(par);
+ upa_writel(FFB_DAC_TGEN, &dac->type);
+ val = upa_readl(&dac->value);
switch (blank) {
case FB_BLANK_UNBLANK: /* Unblanking */
- upa_writel(0x6000, &dac->type);
- tmp = (upa_readl(&dac->value) | 0x1);
- upa_writel(0x6000, &dac->type);
- upa_writel(tmp, &dac->value);
+ val |= FFB_DAC_TGEN_VIDE;
par->flags &= ~FFB_FLAG_BLANKED;
break;
@@ -683,13 +699,16 @@
case FB_BLANK_VSYNC_SUSPEND: /* VESA blank (vsync off) */
case FB_BLANK_HSYNC_SUSPEND: /* VESA blank (hsync off) */
case FB_BLANK_POWERDOWN: /* Poweroff */
- upa_writel(0x6000, &dac->type);
- tmp = (upa_readl(&dac->value) & ~0x1);
- upa_writel(0x6000, &dac->type);
- upa_writel(tmp, &dac->value);
+ val &= ~FFB_DAC_TGEN_VIDE;
par->flags |= FFB_FLAG_BLANKED;
break;
}
+ upa_writel(FFB_DAC_TGEN, &dac->type);
+ upa_writel(val, &dac->value);
+ for (i = 0; i < 10; i++) {
+ upa_writel(FFB_DAC_TGEN, &dac->type);
+ upa_readl(&dac->value);
+ }
spin_unlock_irqrestore(&par->lock, flags);
@@ -894,6 +913,7 @@
struct ffb_dac __iomem *dac;
struct all_info *all;
int err;
+ u32 dac_pnum, dac_rev, dac_mrev;
all = kzalloc(sizeof(*all), GFP_KERNEL);
if (!all)
@@ -948,17 +968,31 @@
if ((upa_readl(&fbc->ucsr) & FFB_UCSR_ALL_ERRORS) != 0)
upa_writel(FFB_UCSR_ALL_ERRORS, &fbc->ucsr);
- ffb_switch_from_graph(&all->par);
-
dac = all->par.dac;
- upa_writel(0x8000, &dac->type);
- all->par.dac_rev = upa_readl(&dac->value) >> 0x1c;
+ upa_writel(FFB_DAC_DID, &dac->type);
+ dac_pnum = upa_readl(&dac->value);
+ dac_rev = (dac_pnum & FFB_DAC_DID_REV) >> FFB_DAC_DID_REV_SHIFT;
+ dac_pnum = (dac_pnum & FFB_DAC_DID_PNUM) >> FFB_DAC_DID_PNUM_SHIFT;
+
+ upa_writel(FFB_DAC_UCTRL, &dac->type);
+ dac_mrev = upa_readl(&dac->value);
+ dac_mrev = (dac_mrev & FFB_DAC_UCTRL_MANREV) >>
+ FFB_DAC_UCTRL_MANREV_SHIFT;
/* Elite3D has different DAC revision numbering, and no DAC revisions
- * have the reversed meaning of cursor enable.
+ * have the reversed meaning of cursor enable. Otherwise, Pacifica 1
+ * ramdacs with manufacturing revision less than 3 have inverted
+ * cursor logic. We identify Pacifica 1 as not Pacifica 2, the
+ * latter having a part number value of 0x236e.
*/
- if (all->par.flags & FFB_FLAG_AFB)
- all->par.dac_rev = 10;
+ if ((all->par.flags & FFB_FLAG_AFB) || dac_pnum == 0x236e) {
+ all->par.flags &= ~FFB_FLAG_INVCURSOR;
+ } else {
+ if (dac_mrev < 3)
+ all->par.flags |= FFB_FLAG_INVCURSOR;
+ }
+
+ ffb_switch_from_graph(&all->par);
/* Unblank it just to be sure. When there are multiple
* FFB/AFB cards in the system, or it is not the OBP
@@ -993,10 +1027,12 @@
dev_set_drvdata(&op->dev, all);
- printk("%s: %s at %016lx, type %d, DAC revision %d\n",
+ printk("%s: %s at %016lx, type %d, "
+ "DAC pnum[%x] rev[%d] manuf_rev[%d]\n",
dp->full_name,
((all->par.flags & FFB_FLAG_AFB) ? "AFB" : "FFB"),
- all->par.physbase, all->par.board_type, all->par.dac_rev);
+ all->par.physbase, all->par.board_type,
+ dac_pnum, dac_rev, dac_mrev);
return 0;
}