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drm/modes: Allow to specify rotation and reflection on the commandline

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Rotations and reflections setup are needed in some scenarios to initialise
properly the initial framebuffer. Some drivers already had a bunch of
quirks to deal with this, such as either a private kernel command line
parameter (omapdss) or on the device tree (various panels).

In order to accomodate this, let's create a video mode parameter to deal
with the rotation and reflexion.

Reviewed-by: Noralf Trønnes <noralf@tronnes.org>
Signed-off-by: Maxime Ripard <maxime.ripard@bootlin.com>
Link: https://patchwork.freedesktop.org/patch/msgid/777da16e42db757c1f5b414b5ca34507097fed5c.1560783090.git-series.maxime.ripard@bootlin.com
This commit is contained in:
Maxime Ripard
2019-06-19 12:17:51 +02:00
parent 3aeeb13d89
commit 1bf4e09227
4 changed files with 146 additions and 20 deletions
Download Patch File Download Diff File Expand all files Collapse all files

114
drivers/gpu/drm/drm_modes.c
View File

@@ -1554,6 +1554,71 @@ static int drm_mode_parse_cmdline_res_mode(const char *str, unsigned int length,
return 0;
}
static int drm_mode_parse_cmdline_options(char *str, size_t len,
struct drm_connector *connector,
struct drm_cmdline_mode *mode)
{
unsigned int rotation = 0;
char *sep = str;
while ((sep = strchr(sep, ','))) {
char *delim, *option;
option = sep + 1;
delim = strchr(option, '=');
if (!delim) {
delim = strchr(option, ',');
if (!delim)
delim = str + len;
}
if (!strncmp(option, "rotate", delim - option)) {
const char *value = delim + 1;
unsigned int deg;
deg = simple_strtol(value, &sep, 10);
/* Make sure we have parsed something */
if (sep == value)
return -EINVAL;
switch (deg) {
case 0:
rotation |= DRM_MODE_ROTATE_0;
break;
case 90:
rotation |= DRM_MODE_ROTATE_90;
break;
case 180:
rotation |= DRM_MODE_ROTATE_180;
break;
case 270:
rotation |= DRM_MODE_ROTATE_270;
break;
default:
return -EINVAL;
}
} else if (!strncmp(option, "reflect_x", delim - option)) {
rotation |= DRM_MODE_REFLECT_X;
sep = delim;
} else if (!strncmp(option, "reflect_y", delim - option)) {
rotation |= DRM_MODE_REFLECT_Y;
sep = delim;
} else {
return -EINVAL;
}
}
mode->rotation_reflection = rotation;
return 0;
}
/**
* drm_mode_parse_command_line_for_connector - parse command line modeline for connector
* @mode_option: optional per connector mode option
@@ -1569,6 +1634,10 @@ static int drm_mode_parse_cmdline_res_mode(const char *str, unsigned int length,
*
* <xres>x<yres>[M][R][-<bpp>][@<refresh>][i][m][eDd]
*
* Additionals options can be provided following the mode, using a comma to
* separate each option. Valid options can be found in
* Documentation/fb/modedb.txt.
*
* The intermediate drm_cmdline_mode structure is required to store additional
* options from the command line modline like the force-enable/disable flag.
*
@@ -1581,9 +1650,10 @@ bool drm_mode_parse_command_line_for_connector(const char *mode_option,
{
const char *name;
bool named_mode = false, parse_extras = false;
unsigned int bpp_off = 0, refresh_off = 0;
unsigned int bpp_off = 0, refresh_off = 0, options_off = 0;
unsigned int mode_end = 0;
char *bpp_ptr = NULL, *refresh_ptr = NULL, *extra_ptr = NULL;
char *options_ptr = NULL;
char *bpp_end_ptr = NULL, *refresh_end_ptr = NULL;
int ret;
@@ -1632,13 +1702,18 @@ bool drm_mode_parse_command_line_for_connector(const char *mode_option,
mode->refresh_specified = true;
}
/* Locate the start of named options */
options_ptr = strchr(name, ',');
if (options_ptr)
options_off = options_ptr - name;
/* Locate the end of the name / resolution, and parse it */
if (bpp_ptr && refresh_ptr) {
mode_end = min(bpp_off, refresh_off);
} else if (bpp_ptr) {
if (bpp_ptr) {
mode_end = bpp_off;
} else if (refresh_ptr) {
mode_end = refresh_off;
} else if (options_ptr) {
mode_end = options_off;
} else {
mode_end = strlen(name);
parse_extras = true;
@@ -1680,24 +1755,23 @@ bool drm_mode_parse_command_line_for_connector(const char *mode_option,
else if (refresh_ptr)
extra_ptr = refresh_end_ptr;
if (extra_ptr) {
if (!named_mode) {
int len = strlen(name) - (extra_ptr - name);
if (extra_ptr &&
extra_ptr != options_ptr) {
int len = strlen(name) - (extra_ptr - name);
ret = drm_mode_parse_cmdline_extra(extra_ptr, len,
connector, mode);
if (ret)
return false;
} else {
int remaining = strlen(name) - (extra_ptr - name);
ret = drm_mode_parse_cmdline_extra(extra_ptr, len,
connector, mode);
if (ret)
return false;
}
/*
* We still have characters to process, while
* we shouldn't have any
*/
if (remaining > 0)
return false;
}
if (options_ptr) {
int len = strlen(name) - (options_ptr - name);
ret = drm_mode_parse_cmdline_options(options_ptr, len,
connector, mode);
if (ret)
return false;
}
return true;