Den 14.06.2019 14.13, skrev Maxime Ripard:
> 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.
>
This needs to be documented in Documentation/fb/modedb.txt
> Signed-off-by: Maxime Ripard <maxime.rip...@bootlin.com>
> ---
> drivers/gpu/drm/drm_client_modeset.c | 20 +++++-
> drivers/gpu/drm/drm_modes.c | 110 ++++++++++++++++++++++------
> include/drm/drm_connector.h | 9 ++-
> 3 files changed, 119 insertions(+), 20 deletions(-)
>
> diff --git a/drivers/gpu/drm/drm_client_modeset.c
> b/drivers/gpu/drm/drm_client_modeset.c
> index 33d4988f22ae..57937e38492c 100644
> --- a/drivers/gpu/drm/drm_client_modeset.c
> +++ b/drivers/gpu/drm/drm_client_modeset.c
> @@ -824,6 +824,7 @@ bool drm_client_rotation(struct drm_mode_set *modeset,
> unsigned int *rotation)
> {
> struct drm_connector *connector = modeset->connectors[0];
> struct drm_plane *plane = modeset->crtc->primary;
> + struct drm_cmdline_mode *cmdline;
> u64 valid_mask = 0;
> unsigned int i;
>
> @@ -844,6 +845,25 @@ bool drm_client_rotation(struct drm_mode_set *modeset,
> unsigned int *rotation)
> *rotation = DRM_MODE_ROTATE_0;
> }
>
> + /**
> + * The panel already defined the default rotation
> + * through its orientation. Whatever has been provided
> + * on the command line needs to be added to that.
> + *
> + * Unfortunately, the rotations are at different bit
> + * indices, so the math to add them up are not as
> + * trivial as they could.
> + */
> + cmdline = &connector->cmdline_mode;
> + if (cmdline->specified) {
> + unsigned int panel_rot = ilog2(*rotation &
> DRM_MODE_ROTATE_MASK);
> + unsigned int cmdline_rot = ilog2(cmdline->rotation &
> DRM_MODE_ROTATE_MASK);
> + unsigned int sum_rot;
> +
> + sum_rot = (panel_rot + cmdline_rot) % 4;
> + *rotation = 1 << sum_rot;
> + }
Looks like reflect_* will be thrown away here?
> +
> /*
> * TODO: support 90 / 270 degree hardware rotation,
> * depending on the hardware this may require the framebuffer
> diff --git a/drivers/gpu/drm/drm_modes.c b/drivers/gpu/drm/drm_modes.c
> index 429d3be17800..b92b7df6784a 100644
> --- a/drivers/gpu/drm/drm_modes.c
> +++ b/drivers/gpu/drm/drm_modes.c
> @@ -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 = rotation;
> +
> + return 0;
> +}
> +
> /**
> * drm_mode_parse_command_line_for_connector - parse command line modeline
> for connector
> * @mode_option: optional per connector mode option
> @@ -1581,9 +1646,10 @@ 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 +1698,18 @@ 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 +1751,23 @@ 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;
> diff --git a/include/drm/drm_connector.h b/include/drm/drm_connector.h
> index f46a53e86d75..68a04169ea36 100644
> --- a/include/drm/drm_connector.h
> +++ b/include/drm/drm_connector.h
> @@ -1006,6 +1006,15 @@ struct drm_cmdline_mode {
> * state to one of the DRM_FORCE_* values.
> */
> enum drm_connector_force force;
> +
> + /**
> + * @rotation:
> + *
> + * Initial rotation of the mode setup from the command line.
> + * See DRM_MODE_ROTATE_*. Only DRM_MODE_ROTATE_0 and
> + * DRM_MODE_ROTATE_180 are supported at the moment.
> + */
Reflect is also supported?
Noralf.
> + unsigned int rotation;
> };
>
> /**
>
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