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drm/ast: Add VGACRAA register constants

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Add register constants for VGACRAA and use them when detecting the
size of the VGA memory. Aligns the code with the programming manual.

Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Reviewed-by: Jocelyn Falempe <jfalempe@redhat.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20250305163207.267650-3-tzimmermann@suse.de
This commit is contained in:
Thomas Zimmermann 2025-03-05 17:30:41 +01:00
parent 2b7970e9a6
commit 9f711d1877
2 changed files with 4 additions and 2 deletions
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5
drivers/gpu/drm/ast/ast_mm.c
View File

@ -37,9 +37,10 @@ static u32 ast_get_vram_size(struct ast_device *ast)
{
u8 jreg;
u32 vram_size;
u8 vgacraa;
jreg = ast_get_index_reg_mask(ast, AST_IO_VGACRI, 0xaa, 0xff);
switch (jreg & 3) {
vgacraa = ast_get_index_reg(ast, AST_IO_VGACRI, 0xaa);
switch (vgacraa & AST_IO_VGACRAA_VGAMEM_SIZE_MASK) {
case 0:
vram_size = SZ_8M;
break;

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

@ -33,6 +33,7 @@
#define AST_IO_VGACRA1_VGAIO_DISABLED BIT(1)
#define AST_IO_VGACRA1_MMIO_ENABLED BIT(2)
#define AST_IO_VGACRA3_DVO_ENABLED BIT(7)
#define AST_IO_VGACRAA_VGAMEM_SIZE_MASK GENMASK(1, 0)
#define AST_IO_VGACRB6_HSYNC_OFF BIT(0)
#define AST_IO_VGACRB6_VSYNC_OFF BIT(1)
#define AST_IO_VGACRCB_HWC_16BPP BIT(0) /* set: ARGB4444, cleared: 2bpp palette */