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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
This commit is contained in:
Stephan Gerhold 2020-01-17 16:34:28 +01:00 committed by Maxime Ripard
parent b50f4f940b
commit e6980a7271
No known key found for this signature in database
GPG Key ID: E3EF0D6F671851C5
3 changed files with 21 additions and 2 deletions
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7
drivers/gpu/drm/drm_modes.c
View File

@ -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;

1
drivers/gpu/drm/selftests/drm_cmdline_selftests.h
View File

@ -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)

15
drivers/gpu/drm/selftests/test-drm_cmdline_parser.c
View File

@ -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);