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drm/ast: Fix test for VGA enabled

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commit 905f21a49d388de3e99438235f3301cabf0c0ef4 upstream.

The test to see if VGA was already enabled is doing an unnecessary
second test from a register that may or may not have been initialized
to a valid value. Remove it.

Signed-off-by: Y.C. Chen <yc_chen@aspeedtech.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Acked-by: Joel Stanley <joel@jms.id.au>
Tested-by: Y.C. Chen <yc_chen@aspeedtech.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Y.C. Chen 2017-02-22 15:10:50 +11:00 • committed by Greg Kroah-Hartman
parent 0d80ac62b6
commit 8b78765238
1 changed files with 2 additions and 6 deletions
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8
drivers/gpu/drm/ast/ast_post.c
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@ -58,13 +58,9 @@ bool ast_is_vga_enabled(struct drm_device *dev)
/* TODO 1180 */
} else {
ch = ast_io_read8(ast, AST_IO_VGA_ENABLE_PORT);
if (ch) {
ast_open_key(ast);
ch = ast_get_index_reg_mask(ast, AST_IO_CRTC_PORT, 0xb6, 0xff);
return ch & 0x04;
}
return !!(ch & 0x01);
}
return 0;
return false;
}
static const u8 extreginfo[] = { 0x0f, 0x04, 0x1c, 0xff };