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278 lines
8.2 KiB
Diff
278 lines
8.2 KiB
Diff
From 5a8ccd79b6bad32e52620a94199bf1af2e19708e Mon Sep 17 00:00:00 2001
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From: Maxime Ripard <maxime.ripard@bootlin.com>
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Date: Wed, 19 Jun 2019 12:17:51 +0200
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Subject: [PATCH] drm/modes: Allow to specify rotation and reflection
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on the commandline
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MIME-Version: 1.0
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Content-Type: text/plain; charset=UTF-8
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Content-Transfer-Encoding: 8bit
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Commit 1bf4e09227c345e246062285eba4b8fe660e512e upstream.
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Minor conflict resolution as upstream has moved functions
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from drm_fb_helper.c to a new drm_client_modeset.c
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Rotations and reflections setup are needed in some scenarios to initialise
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properly the initial framebuffer. Some drivers already had a bunch of
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quirks to deal with this, such as either a private kernel command line
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parameter (omapdss) or on the device tree (various panels).
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In order to accomodate this, let's create a video mode parameter to deal
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with the rotation and reflexion.
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Reviewed-by: Noralf Trønnes <noralf@tronnes.org>
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Signed-off-by: Maxime Ripard <maxime.ripard@bootlin.com>
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Link: https://patchwork.freedesktop.org/patch/msgid/777da16e42db757c1f5b414b5ca34507097fed5c.1560783090.git-series.maxime.ripard@bootlin.com
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---
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Documentation/fb/modedb.txt | 12 ++++
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drivers/gpu/drm/drm_fb_helper.c | 30 +++++++++
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drivers/gpu/drm/drm_modes.c | 114 ++++++++++++++++++++++++++------
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include/drm/drm_connector.h | 10 +++
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4 files changed, 146 insertions(+), 20 deletions(-)
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--- a/Documentation/fb/modedb.txt
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+++ b/Documentation/fb/modedb.txt
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@@ -51,6 +51,18 @@ To force the VGA output to be enabled an
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Specifying the option multiple times for different ports is possible, e.g.:
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video=LVDS-1:d video=HDMI-1:D
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+Options can also be passed after the mode, using commas as separator.
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+
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+ Sample usage: 720x480,rotate=180 - 720x480 mode, rotated by 180 degrees
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+
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+Valid options are:
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+
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+ - reflect_x (boolean): Perform an axial symmetry on the X axis
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+ - reflect_y (boolean): Perform an axial symmetry on the Y axis
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+ - rotate (integer): Rotate the initial framebuffer by x
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+ degrees. Valid values are 0, 90, 180 and 270.
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+
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+
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***** oOo ***** oOo ***** oOo ***** oOo ***** oOo ***** oOo ***** oOo *****
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What is the VESA(TM) Coordinated Video Timings (CVT)?
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--- a/drivers/gpu/drm/drm_fb_helper.c
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+++ b/drivers/gpu/drm/drm_fb_helper.c
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@@ -2464,6 +2464,7 @@ static void drm_setup_crtc_rotation(stru
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struct drm_connector *connector)
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{
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struct drm_plane *plane = fb_crtc->mode_set.crtc->primary;
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+ struct drm_cmdline_mode *cmdline;
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uint64_t valid_mask = 0;
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int i, rotation;
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@@ -2483,6 +2484,35 @@ static void drm_setup_crtc_rotation(stru
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rotation = DRM_MODE_ROTATE_0;
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}
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+ /**
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+ * The panel already defined the default rotation
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+ * through its orientation. Whatever has been provided
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+ * on the command line needs to be added to that.
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+ *
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+ * Unfortunately, the rotations are at different bit
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+ * indices, so the math to add them up are not as
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+ * trivial as they could.
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+ *
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+ * Reflections on the other hand are pretty trivial to deal with, a
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+ * simple XOR between the two handle the addition nicely.
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+ */
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+ cmdline = &connector->cmdline_mode;
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+ if (cmdline->specified) {
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+ unsigned int cmdline_rest, panel_rest;
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+ unsigned int cmdline_rot, panel_rot;
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+ unsigned int sum_rot, sum_rest;
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+
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+ panel_rot = ilog2(rotation & DRM_MODE_ROTATE_MASK);
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+ cmdline_rot = ilog2(cmdline->rotation_reflection & DRM_MODE_ROTATE_MASK);
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+ sum_rot = (panel_rot + cmdline_rot) % 4;
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+
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+ panel_rest = rotation & ~DRM_MODE_ROTATE_MASK;
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+ cmdline_rest = cmdline->rotation_reflection & ~DRM_MODE_ROTATE_MASK;
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+ sum_rest = panel_rest ^ cmdline_rest;
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+
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+ rotation = (1 << sum_rot) | sum_rest;
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+ }
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+
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/*
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* TODO: support 90 / 270 degree hardware rotation,
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* depending on the hardware this may require the framebuffer
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--- a/drivers/gpu/drm/drm_modes.c
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+++ b/drivers/gpu/drm/drm_modes.c
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@@ -1560,6 +1560,71 @@ static int drm_mode_parse_cmdline_res_mo
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return 0;
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}
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+static int drm_mode_parse_cmdline_options(char *str, size_t len,
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+ struct drm_connector *connector,
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+ struct drm_cmdline_mode *mode)
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+{
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+ unsigned int rotation = 0;
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+ char *sep = str;
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+
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+ while ((sep = strchr(sep, ','))) {
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+ char *delim, *option;
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+
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+ option = sep + 1;
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+ delim = strchr(option, '=');
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+ if (!delim) {
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+ delim = strchr(option, ',');
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+
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+ if (!delim)
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+ delim = str + len;
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+ }
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+
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+ if (!strncmp(option, "rotate", delim - option)) {
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+ const char *value = delim + 1;
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+ unsigned int deg;
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+
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+ deg = simple_strtol(value, &sep, 10);
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+
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+ /* Make sure we have parsed something */
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+ if (sep == value)
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+ return -EINVAL;
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+
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+ switch (deg) {
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+ case 0:
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+ rotation |= DRM_MODE_ROTATE_0;
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+ break;
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+
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+ case 90:
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+ rotation |= DRM_MODE_ROTATE_90;
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+ break;
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+
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+ case 180:
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+ rotation |= DRM_MODE_ROTATE_180;
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+ break;
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+
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+ case 270:
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+ rotation |= DRM_MODE_ROTATE_270;
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+ break;
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+
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+ default:
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+ return -EINVAL;
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+ }
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+ } else if (!strncmp(option, "reflect_x", delim - option)) {
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+ rotation |= DRM_MODE_REFLECT_X;
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+ sep = delim;
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+ } else if (!strncmp(option, "reflect_y", delim - option)) {
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+ rotation |= DRM_MODE_REFLECT_Y;
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+ sep = delim;
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+ } else {
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+ return -EINVAL;
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+ }
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+ }
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+
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+ mode->rotation_reflection = rotation;
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+
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+ return 0;
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+}
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+
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/**
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* drm_mode_parse_command_line_for_connector - parse command line modeline for connector
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* @mode_option: optional per connector mode option
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@@ -1575,6 +1640,10 @@ static int drm_mode_parse_cmdline_res_mo
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*
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* <xres>x<yres>[M][R][-<bpp>][@<refresh>][i][m][eDd]
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*
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+ * Additionals options can be provided following the mode, using a comma to
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+ * separate each option. Valid options can be found in
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+ * Documentation/fb/modedb.txt.
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+ *
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* The intermediate drm_cmdline_mode structure is required to store additional
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* options from the command line modline like the force-enable/disable flag.
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*
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@@ -1587,9 +1656,10 @@ bool drm_mode_parse_command_line_for_con
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{
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const char *name;
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bool named_mode = false, parse_extras = false;
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- unsigned int bpp_off = 0, refresh_off = 0;
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+ unsigned int bpp_off = 0, refresh_off = 0, options_off = 0;
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unsigned int mode_end = 0;
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char *bpp_ptr = NULL, *refresh_ptr = NULL, *extra_ptr = NULL;
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+ char *options_ptr = NULL;
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char *bpp_end_ptr = NULL, *refresh_end_ptr = NULL;
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int ret;
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@@ -1638,13 +1708,18 @@ bool drm_mode_parse_command_line_for_con
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mode->refresh_specified = true;
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}
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+ /* Locate the start of named options */
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+ options_ptr = strchr(name, ',');
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+ if (options_ptr)
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+ options_off = options_ptr - name;
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+
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/* Locate the end of the name / resolution, and parse it */
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- if (bpp_ptr && refresh_ptr) {
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- mode_end = min(bpp_off, refresh_off);
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- } else if (bpp_ptr) {
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+ if (bpp_ptr) {
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mode_end = bpp_off;
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} else if (refresh_ptr) {
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mode_end = refresh_off;
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+ } else if (options_ptr) {
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+ mode_end = options_off;
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} else {
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mode_end = strlen(name);
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parse_extras = true;
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@@ -1686,24 +1761,23 @@ bool drm_mode_parse_command_line_for_con
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else if (refresh_ptr)
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extra_ptr = refresh_end_ptr;
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- if (extra_ptr) {
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- if (!named_mode) {
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- int len = strlen(name) - (extra_ptr - name);
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-
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- ret = drm_mode_parse_cmdline_extra(extra_ptr, len,
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- connector, mode);
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- if (ret)
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- return false;
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- } else {
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- int remaining = strlen(name) - (extra_ptr - name);
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+ if (extra_ptr &&
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+ extra_ptr != options_ptr) {
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+ int len = strlen(name) - (extra_ptr - name);
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- /*
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- * We still have characters to process, while
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- * we shouldn't have any
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- */
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- if (remaining > 0)
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- return false;
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- }
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+ ret = drm_mode_parse_cmdline_extra(extra_ptr, len,
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+ connector, mode);
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+ if (ret)
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+ return false;
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+ }
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+
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+ if (options_ptr) {
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+ int len = strlen(name) - (options_ptr - name);
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+
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+ ret = drm_mode_parse_cmdline_options(options_ptr, len,
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+ connector, mode);
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+ if (ret)
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+ return false;
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}
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return true;
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--- a/include/drm/drm_connector.h
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+++ b/include/drm/drm_connector.h
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@@ -857,6 +857,16 @@ struct drm_cmdline_mode {
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* state to one of the DRM_FORCE_* values.
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*/
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enum drm_connector_force force;
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+
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+ /**
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+ * @rotation_reflection:
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+ *
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+ * Initial rotation and reflection of the mode setup from the
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+ * command line. See DRM_MODE_ROTATE_* and
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+ * DRM_MODE_REFLECT_*. The only rotations supported are
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+ * DRM_MODE_ROTATE_0 and DRM_MODE_ROTATE_180.
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+ */
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+ unsigned int rotation_reflection;
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};
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/**
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