linux-kernel - [PATCH] drm/ast: Fix NO EDID on DP501

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Date:   Thu, 18 Aug 2022 13:49:02 +0800
From:   KuoHsiang Chou <kuohsiang_chou@...eedtech.com>
To:     <tzimmermann@...e.de>, <dri-devel@...ts.freedesktop.org>,
        <linux-kernel@...r.kernel.org>
CC:     <airlied@...hat.com>, <airlied@...ux.ie>, <daniel@...ll.ch>,
        <kuohsiang_chou@...eedtech.com>, <arc_sung@...eedtech.com>,
        <tommy_huang@...eedtech.com>, <hungju_huang@...eedtech.com>,
        <luke_chen@...eedtech.com>
Subject: [PATCH] drm/ast: Fix NO EDID on DP501

1. Corrected the definition of AST_DP501_PNP_CONNECTED.
2. Created the Base address for DP501 MCU.

Signed-off-by: KuoHsiang Chou <kuohsiang_chou@...eedtech.com>
---
 drivers/gpu/drm/ast/ast_dp501.c | 10 ++++++++--
 drivers/gpu/drm/ast/ast_drv.h   |  2 +-
 2 files changed, 9 insertions(+), 3 deletions(-)

diff --git a/drivers/gpu/drm/ast/ast_dp501.c b/drivers/gpu/drm/ast/ast_dp501.c
index 4f75a9efb..4693d68ca 100644
--- a/drivers/gpu/drm/ast/ast_dp501.c
+++ b/drivers/gpu/drm/ast/ast_dp501.c
@@ -180,7 +180,10 @@ void ast_set_dp501_video_output(struct drm_device *dev, u8 mode)

 static u32 get_fw_base(struct ast_private *ast)
 {
-	return ast_mindwm(ast, 0x1e6e2104) & 0x7fffffff;
+	if (ast->chip == AST2500)
+		return ast_mindwm(ast, 0x1e6e2104) & 0xfffffffe;
+	else
+		return ast_mindwm(ast, 0x1e6e2104) & 0x7fffffff;
 }

 bool ast_backup_fw(struct drm_device *dev, u8 *addr, u32 size)
@@ -257,7 +260,10 @@ static bool ast_launch_m68k(struct drm_device *dev)
 		ast_moutdwm(ast, 0x1e6e2000, 0x1688a8a8);

 		/* Launch FW */
-		ast_moutdwm(ast, 0x1e6e2104, 0x80000000 + boot_address);
+		if (ast->chip == AST2500)
+			ast_moutdwm(ast, 0x1e6e2104, boot_address | 0x00000001);
+		else
+			ast_moutdwm(ast, 0x1e6e2104, boot_address | 0x80000000);
 		ast_moutdwm(ast, 0x1e6e2100, 1);

 		/* Update Scratch */
diff --git a/drivers/gpu/drm/ast/ast_drv.h b/drivers/gpu/drm/ast/ast_drv.h
index 2e44b971c..81e1317d3 100644
--- a/drivers/gpu/drm/ast/ast_drv.h
+++ b/drivers/gpu/drm/ast/ast_drv.h
@@ -358,7 +358,7 @@ int ast_mode_config_init(struct ast_private *ast);

 #define AST_DP501_FW_VERSION_MASK	GENMASK(7, 4)
 #define AST_DP501_FW_VERSION_1		BIT(4)
-#define AST_DP501_PNP_CONNECTED		BIT(1)
+#define AST_DP501_PNP_CONNECTED		BIT(0)

 #define AST_DP501_DEFAULT_DCLK	65


base-commit: 8953e41fa70d4507c6f5508e030347f7eda3ba8a
--
2.27.0