drm/ast: astdp: fix loop timeout check

This code has an issue because it loops until "i" is set to UINT_MAX but
the test for failure assumes that "i" is set to zero.  The result is that
it will only print an error message if we succeed on the very last try.
Reformat the loop to count forwards instead of backwards.

Fixes: 2281475168d2 ("drm/ast: astdp: Perform link training during atomic_enable")
Signed-off-by: Dan Carpenter <dan.carpenter@linaro.org>
Reviewed-by: Thomas Zimmermann <tzimmermann@suse.de>
Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Link: https://patchwork.freedesktop.org/patch/msgid/1ba8da25-2d09-4924-a4ff-c0714bfbb192@stanley.mountain

diff --git a/drivers/gpu/drm/ast/ast_dp.c b/drivers/gpu/drm/ast/ast_dp.c
index 5d07678b502c2dfd36ce418e4ff71a76807590eb..ca022c287785e851c0131133821f2e3a54170571 100644 (file)
--- a/drivers/gpu/drm/ast/ast_dp.c
+++ b/drivers/gpu/drm/ast/ast_dp.c
@@ -146,18 +146,19 @@ void ast_dp_power_on_off(struct drm_device *dev, bool on)
 void ast_dp_link_training(struct ast_device *ast)
 {
        struct drm_device *dev = &ast->base;
-       unsigned int i = 10;
+       int i;
 
-       while (i--) {
-               u8 vgacrdc = ast_get_index_reg(ast, AST_IO_VGACRI, 0xdc);
+       for (i = 0; i < 10; i++) {
+               u8 vgacrdc;
 
-               if (vgacrdc & AST_IO_VGACRDC_LINK_SUCCESS)
-                       break;
                if (i)
                        msleep(100);
+
+               vgacrdc = ast_get_index_reg(ast, AST_IO_VGACRI, 0xdc);
+               if (vgacrdc & AST_IO_VGACRDC_LINK_SUCCESS)
+                       return;
        }
-       if (!i)
-               drm_err(dev, "Link training failed\n");
+       drm_err(dev, "Link training failed\n");
 }
 
 void ast_dp_set_on_off(struct drm_device *dev, bool on)