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@xxxxxxx>
---
drivers/gpu/drm/ast/ast_mm.c | 5 +++--
drivers/gpu/drm/ast/ast_reg.h | 1 +
2 files changed, 4 insertions(+), 2 deletions(-)
diff --git a/drivers/gpu/drm/ast/ast_mm.c b/drivers/gpu/drm/ast/ast_mm.c
index 20d833632a01..8d8aac8c0814 100644
--- a/drivers/gpu/drm/ast/ast_mm.c
+++ b/drivers/gpu/drm/ast/ast_mm.c
@@ -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;
diff --git a/drivers/gpu/drm/ast/ast_reg.h b/drivers/gpu/drm/ast/ast_reg.h
index bb2cc1d8b84e..039b93bed19e 100644
--- a/drivers/gpu/drm/ast/ast_reg.h
+++ b/drivers/gpu/drm/ast/ast_reg.h
@@ -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 */
--
2.48.1
