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drm/nv40: rework lvds table parsing

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All indications seem to be that the version 0x30 table should be handled
the same way as 0x40 (as used on G80), at least for the parts that we
currently try use.

This commit cleans up the parsing to make it clearer about what we're
actually trying to achieve, and unifies the 0x30/0x40 parsing.

Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
This commit is contained in:
Ben Skeggs 2010-03-18 12:05:43 +10:00
parent a76fb4e8ff
commit f3bbb9ccbf
2 changed files with 17 additions and 28 deletions
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44
drivers/gpu/drm/nouveau/nouveau_bios.c
View File

@ -3198,7 +3198,6 @@ static int run_lvds_table(struct drm_device *dev, struct dcb_entry *dcbent, int
struct nvbios *bios = &dev_priv->vbios;
unsigned int outputset = (dcbent->or == 4) ? 1 : 0;
uint16_t scriptptr = 0, clktable;
uint8_t clktableptr = 0;
/*
* For now we assume version 3.0 table - g80 support will need some
@ -3217,26 +3216,29 @@ static int run_lvds_table(struct drm_device *dev, struct dcb_entry *dcbent, int
scriptptr = ROM16(bios->data[bios->fp.lvdsmanufacturerpointer + 11 + outputset * 2]);
break;
case LVDS_RESET:
clktable = bios->fp.lvdsmanufacturerpointer + 15;
if (dcbent->or == 4)
clktable += 8;
if (dcbent->lvdsconf.use_straps_for_mode) {
if (bios->fp.dual_link)
clktableptr += 2;
if (bios->fp.BITbit1)
clktableptr++;
clktable += 4;
if (bios->fp.if_is_24bit)
clktable += 2;
} else {
/* using EDID */
uint8_t fallback = bios->data[bios->fp.lvdsmanufacturerpointer + 4];
int fallbackcmpval = (dcbent->or == 4) ? 4 : 1;
int cmpval_24bit = (dcbent->or == 4) ? 4 : 1;
if (bios->fp.dual_link) {
clktableptr += 2;
fallbackcmpval *= 2;
clktable += 4;
cmpval_24bit <<= 1;
}
if (fallbackcmpval & fallback)
clktableptr++;
if (bios->fp.strapless_is_24bit & cmpval_24bit)
clktable += 2;
}
/* adding outputset * 8 may not be correct */
clktable = ROM16(bios->data[bios->fp.lvdsmanufacturerpointer + 15 + clktableptr * 2 + outputset * 8]);
clktable = ROM16(bios->data[clktable]);
if (!clktable) {
NV_ERROR(dev, "Pixel clock comparison table not found\n");
return -ENOENT;
@ -3638,31 +3640,19 @@ int nouveau_bios_parse_lvds_table(struct drm_device *dev, int pxclk, bool *dl, b
*if_is_24bit = bios->data[lvdsofs] & 16;
break;
case 0x30:
/*
* My money would be on there being a 24 bit interface bit in
* this table, but I have no example of a laptop bios with a
* 24 bit panel to confirm that. Hence we shout loudly if any
* bit other than bit 0 is set (I've not even seen bit 1)
*/
if (bios->data[lvdsofs] > 1)
NV_ERROR(dev,
"You have a very unusual laptop display; please report it\n");
case 0x40:
/*
* No sign of the "power off for reset" or "reset for panel
* on" bits, but it's safer to assume we should
*/
bios->fp.power_off_for_reset = true;
bios->fp.reset_after_pclk_change = true;
/*
* It's ok lvdsofs is wrong for nv4x edid case; dual_link is
* over-written, and BITbit1 isn't used
* over-written, and if_is_24bit isn't used
*/
bios->fp.dual_link = bios->data[lvdsofs] & 1;
bios->fp.BITbit1 = bios->data[lvdsofs] & 2;
bios->fp.duallink_transition_clk = ROM16(bios->data[bios->fp.lvdsmanufacturerpointer + 5]) * 10;
break;
case 0x40:
bios->fp.dual_link = bios->data[lvdsofs] & 1;
bios->fp.if_is_24bit = bios->data[lvdsofs] & 2;
bios->fp.strapless_is_24bit = bios->data[bios->fp.lvdsmanufacturerpointer + 4];
bios->fp.duallink_transition_clk = ROM16(bios->data[bios->fp.lvdsmanufacturerpointer + 5]) * 10;

1
drivers/gpu/drm/nouveau/nouveau_bios.h
View File

@ -267,7 +267,6 @@ struct nvbios {
bool reset_after_pclk_change;
bool dual_link;
bool link_c_increment;
bool BITbit1;
bool if_is_24bit;
int duallink_transition_clk;
uint8_t strapless_is_24bit;