From d6cbe630f3e9a5b11ba4082ff980ccc094224610 Mon Sep 17 00:00:00 2001
From: Jammy Huang <jammy_huang@aspeedtech.com>
Date: Fri, 16 Sep 2022 17:17:06 +0800
Subject: drm/ast: Fix video broken in some resolutions on ast2600
Git-commit: d6cbe630f3e9a5b11ba4082ff980ccc094224610
Patch-mainline: v6.1-rc1
References: jsc#PED-1465
Some cases are not handled well for ast2600.
Signed-off-by: Jammy Huang <jammy_huang@aspeedtech.com>
Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Link: https://patchwork.freedesktop.org/patch/msgid/20220916091706.4559-1-jammy_huang@aspeedtech.com
Acked-by: Thomas Zimmermann <tzimmermann@suse.de>
---
drivers/gpu/drm/ast/ast_mode.c | 10 ++++++++--
1 file changed, 8 insertions(+), 2 deletions(-)
diff --git a/drivers/gpu/drm/ast/ast_mode.c b/drivers/gpu/drm/ast/ast_mode.c
index b61334409637..1bc0220e6783 100644
--- a/drivers/gpu/drm/ast/ast_mode.c
+++ b/drivers/gpu/drm/ast/ast_mode.c
@@ -313,7 +313,7 @@ static void ast_set_crtc_reg(struct ast_private *ast,
u8 jreg05 = 0, jreg07 = 0, jreg09 = 0, jregAC = 0, jregAD = 0, jregAE = 0;
u16 temp, precache = 0;
- if ((ast->chip == AST2500) &&
+ if ((ast->chip == AST2500 || ast->chip == AST2600) &&
(vbios_mode->enh_table->flags & AST2500PreCatchCRT))
precache = 40;
@@ -354,6 +354,12 @@ static void ast_set_crtc_reg(struct ast_private *ast,
ast_set_index_reg_mask(ast, AST_IO_CRTC_PORT, 0xAC, 0x00, jregAC);
ast_set_index_reg_mask(ast, AST_IO_CRTC_PORT, 0xAD, 0x00, jregAD);
+ // Workaround for HSync Time non octave pixels (1920x1080@60Hz HSync 44 pixels);
+ if ((ast->chip == AST2600) && (mode->crtc_vdisplay == 1080))
+ ast_set_index_reg_mask(ast, AST_IO_CRTC_PORT, 0xFC, 0xFD, 0x02);
+ else
+ ast_set_index_reg_mask(ast, AST_IO_CRTC_PORT, 0xFC, 0xFD, 0x00);
+
/* vert timings */
temp = (mode->crtc_vtotal) - 2;
if (temp & 0x100)
@@ -431,7 +437,7 @@ static void ast_set_dclk_reg(struct ast_private *ast,
{
const struct ast_vbios_dclk_info *clk_info;
- if (ast->chip == AST2500)
+ if ((ast->chip == AST2500) || (ast->chip == AST2600))
clk_info = &dclk_table_ast2500[vbios_mode->enh_table->dclk_index];
else
clk_info = &dclk_table[vbios_mode->enh_table->dclk_index];
--
2.39.0