linux-kernel - [PATCH] drm/ast: Update the sequence of Clearing Fast-reset

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Date:   Mon, 18 Jan 2021 16:57:55 +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>,
        <jenmin_yuan@...eedtech.com>, <kuohsiang_chou@...eedtech.com>,
        <arc_sung@...eedtech.com>, <tommy_huang@...eedtech.com>
Subject: [PATCH] drm/ast: Update the sequence of Clearing Fast-reset

[Bug][AST2500]
If SCU00 is not unlocked, just enter its password again.
It is unnecessary to clear AHB lock condition and restore WDT default
setting again, before Fast-reset clearing.

Signed-off-by: KuoHsiang Chou <kuohsiang_chou@...eedtech.com>
---
 drivers/gpu/drm/ast/ast_post.c | 5 +----
 1 file changed, 1 insertion(+), 4 deletions(-)

diff --git a/drivers/gpu/drm/ast/ast_post.c b/drivers/gpu/drm/ast/ast_post.c
index 1f0007daa005..4f194c5fd2c2 100644
--- a/drivers/gpu/drm/ast/ast_post.c
+++ b/drivers/gpu/drm/ast/ast_post.c
@@ -2030,7 +2030,6 @@ void ast_patch_ahb_2500(struct ast_private *ast)
 {
 	u32	data;

-patch_ahb_lock:
 	/* Clear bus lock condition */
 	ast_moutdwm(ast, 0x1e600000, 0xAEED1A03);
 	ast_moutdwm(ast, 0x1e600084, 0x00010000);
@@ -2044,11 +2043,9 @@ void ast_patch_ahb_2500(struct ast_private *ast)
 		ast_moutdwm(ast, 0x1E78500c, 0x00000033);
 		udelay(1000);
 	}
-	ast_moutdwm(ast, 0x1e6e2000, 0x1688A8A8);
 	do {
+		ast_moutdwm(ast, 0x1e6e2000, 0x1688A8A8);
 		data = ast_mindwm(ast, 0x1e6e2000);
-		if (data == 0xffffffff)
-			goto patch_ahb_lock;
 	}	while (data != 1);
 	ast_moutdwm(ast, 0x1e6e207c, 0x08000000);	/* clear fast reset */
 }
--
2.18.4