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drm/ast: Add VGACR99 register constants

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Add register constants for VGACR99 and use them when detecting the
size of the VGA memory. Aligns the code with the programming manual.
Also replace literal size values with Linux' SZ_ size constants.

Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Reviewed-by: Jocelyn Falempe <jfalempe@redhat.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20250305163207.267650-4-tzimmermann@suse.de
This commit is contained in:
Thomas Zimmermann
2025-03-05 17:30:42 +01:00
parent 9f711d1877
commit a958c7f13b
2 changed files with 7 additions and 7 deletions
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13
drivers/gpu/drm/ast/ast_mm.c
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@@ -35,9 +35,8 @@
static u32 ast_get_vram_size(struct ast_device *ast)
{
u8 jreg;
u32 vram_size;
u8 vgacraa;
u8 vgacr99, vgacraa;
vgacraa = ast_get_index_reg(ast, AST_IO_VGACRI, 0xaa);
switch (vgacraa & AST_IO_VGACRAA_VGAMEM_SIZE_MASK) {
@@ -55,16 +54,16 @@ static u32 ast_get_vram_size(struct ast_device *ast)
break;
}
jreg = ast_get_index_reg_mask(ast, AST_IO_VGACRI, 0x99, 0xff);
switch (jreg & 0x03) {
vgacr99 = ast_get_index_reg(ast, AST_IO_VGACRI, 0x99);
switch (vgacr99 & AST_IO_VGACR99_VGAMEM_RSRV_MASK) {
case 1:
vram_size -= 0x100000;
vram_size -= SZ_1M;
break;
case 2:
vram_size -= 0x200000;
vram_size -= SZ_2M;
break;
case 3:
vram_size -= 0x400000;
vram_size -= SZ_4M;
break;
}

1
drivers/gpu/drm/ast/ast_reg.h
View File

@@ -30,6 +30,7 @@
#define AST_IO_VGACRI (0x54)
#define AST_IO_VGACR80_PASSWORD (0xa8)
#define AST_IO_VGACR99_VGAMEM_RSRV_MASK GENMASK(1, 0)
#define AST_IO_VGACRA1_VGAIO_DISABLED BIT(1)
#define AST_IO_VGACRA1_MMIO_ENABLED BIT(2)
#define AST_IO_VGACRA3_DVO_ENABLED BIT(7)