drm/modes: Make sure to parse valid rotation value from cmdline

A rotation value should have exactly one rotation angle.
At the moment there is no validation for this when parsing video=
parameters from the command line. This causes problems later on
when we try to combine the command line rotation with the panel
orientation.

To make sure that we generate a valid rotation value:
  - Set DRM_MODE_ROTATE_0 by default (if no rotate= option is set)
  - Validate that there is exactly one rotation angle set
    (i.e. specifying the rotate= option multiple times is invalid)

Signed-off-by: Stephan Gerhold <stephan@gerhold.net>
Signed-off-by: Maxime Ripard <maxime@cerno.tech>
Link: https://patchwork.freedesktop.org/patch/msgid/20200117153429.54700-2-stephan@gerhold.net

diff --git a/drivers/gpu/drm/drm_modes.c b/drivers/gpu/drm/drm_modes.c
index 10336b1..d4d6451 100644 (file)
--- a/drivers/gpu/drm/drm_modes.c
+++ b/drivers/gpu/drm/drm_modes.c
@@ -1698,6 +1698,13 @@ static int drm_mode_parse_cmdline_options(const char *str,
        if (rotation && freestanding)
                return -EINVAL;
 
+       if (!(rotation & DRM_MODE_ROTATE_MASK))
+               rotation |= DRM_MODE_ROTATE_0;
+
+       /* Make sure there is exactly one rotation defined */
+       if (!is_power_of_2(rotation & DRM_MODE_ROTATE_MASK))
+               return -EINVAL;
+
        mode->rotation_reflection = rotation;
 
        return 0;

diff --git a/drivers/gpu/drm/selftests/drm_cmdline_selftests.h b/drivers/gpu/drm/selftests/drm_cmdline_selftests.h
index ceac7af..29e367d 100644 (file)
--- a/drivers/gpu/drm/selftests/drm_cmdline_selftests.h
+++ b/drivers/gpu/drm/selftests/drm_cmdline_selftests.h
@@ -53,6 +53,7 @@ cmdline_test(drm_cmdline_test_rotate_0)
 cmdline_test(drm_cmdline_test_rotate_90)
 cmdline_test(drm_cmdline_test_rotate_180)
 cmdline_test(drm_cmdline_test_rotate_270)
+cmdline_test(drm_cmdline_test_rotate_multiple)
 cmdline_test(drm_cmdline_test_rotate_invalid_val)
 cmdline_test(drm_cmdline_test_rotate_truncated)
 cmdline_test(drm_cmdline_test_hmirror)

diff --git a/drivers/gpu/drm/selftests/test-drm_cmdline_parser.c b/drivers/gpu/drm/selftests/test-drm_cmdline_parser.c
index 520f3e6..d96cd89 100644 (file)
--- a/drivers/gpu/drm/selftests/test-drm_cmdline_parser.c
+++ b/drivers/gpu/drm/selftests/test-drm_cmdline_parser.c
@@ -856,6 +856,17 @@ static int drm_cmdline_test_rotate_270(void *ignored)
        return 0;
 }
 
+static int drm_cmdline_test_rotate_multiple(void *ignored)
+{
+       struct drm_cmdline_mode mode = { };
+
+       FAIL_ON(drm_mode_parse_command_line_for_connector("720x480,rotate=0,rotate=90",
+                                                         &no_connector,
+                                                         &mode));
+
+       return 0;
+}
+
 static int drm_cmdline_test_rotate_invalid_val(void *ignored)
 {
        struct drm_cmdline_mode mode = { };
@@ -888,7 +899,7 @@ static int drm_cmdline_test_hmirror(void *ignored)
        FAIL_ON(!mode.specified);
        FAIL_ON(mode.xres != 720);
        FAIL_ON(mode.yres != 480);
-       FAIL_ON(mode.rotation_reflection != DRM_MODE_REFLECT_X);
+       FAIL_ON(mode.rotation_reflection != (DRM_MODE_ROTATE_0 | DRM_MODE_REFLECT_X));
 
        FAIL_ON(mode.refresh_specified);
 
@@ -913,7 +924,7 @@ static int drm_cmdline_test_vmirror(void *ignored)
        FAIL_ON(!mode.specified);
        FAIL_ON(mode.xres != 720);
        FAIL_ON(mode.yres != 480);
-       FAIL_ON(mode.rotation_reflection != DRM_MODE_REFLECT_Y);
+       FAIL_ON(mode.rotation_reflection != (DRM_MODE_ROTATE_0 | DRM_MODE_REFLECT_Y));
 
        FAIL_ON(mode.refresh_specified);