Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
drm/ast: Gen7: Switch default registers to gen4+ state
Change the default register settings for Gen7 to mach Gen4 and
later. Gen7 currently uses the settings for Gen1, which is most
likely incorrect.
Using Gen4+ settings enables E2M linear-access modes in VGACRA2.
It appears to be related to the chip's PCIE2MBOX feature, which
is unused.
Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Reviewed-by: Jocelyn Falempe <jfalempe@redhat.com>
Link: https://lore.kernel.org/r/20250706162816.211552-11-tzimmermann@suse.de
+1
-35
+1
-32
drivers/gpu/drm/ast/ast_2600.c
+1
-32
drivers/gpu/drm/ast/ast_2600.c
···
33
33
* POST
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34
*/
35
35
36
-
void ast_2600_set_def_ext_reg(struct ast_device *ast)
37
-
{
38
-
static const u8 extreginfo[] = { 0x0f, 0x04, 0x1c, 0xff };
39
-
u8 i, index, reg;
40
-
const u8 *ext_reg_info;
41
-
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-
/* reset scratch */
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-
for (i = 0x81; i <= 0x9f; i++)
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-
ast_set_index_reg(ast, AST_IO_VGACRI, i, 0x00);
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-
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-
ext_reg_info = extreginfo;
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-
index = 0xa0;
48
-
while (*ext_reg_info != 0xff) {
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-
ast_set_index_reg_mask(ast, AST_IO_VGACRI, index, 0x00, *ext_reg_info);
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-
index++;
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-
ext_reg_info++;
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-
}
53
-
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-
/* disable standard IO/MEM decode if secondary */
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-
/* ast_set_index_reg-mask(ast, AST_IO_VGACRI, 0xa1, 0xff, 0x3); */
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-
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-
/* Set Ext. Default */
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-
ast_set_index_reg_mask(ast, AST_IO_VGACRI, 0x8c, 0x00, 0x01);
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-
ast_set_index_reg_mask(ast, AST_IO_VGACRI, 0xb7, 0x00, 0x00);
60
-
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-
/* Enable RAMDAC for A1 */
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-
reg = 0x04;
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-
reg |= 0x20;
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-
ast_set_index_reg_mask(ast, AST_IO_VGACRI, 0xb6, 0xff, reg);
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-
}
66
-
67
36
int ast_2600_post(struct ast_device *ast)
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37
{
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-
ast_2600_set_def_ext_reg(ast);
38
+
ast_2300_set_def_ext_reg(ast);
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39
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40
if (ast->tx_chip == AST_TX_ASTDP)
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41
return ast_dp_launch(ast);