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author | Rolf Eike Beer <eike-kernel@sf-tec.de> | 2011-06-15 09:27:02 (GMT) |
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committer | Dave Airlie <airlied@redhat.com> | 2011-07-25 11:02:26 (GMT) |
commit | 04fee895ef98ffbb91a941b53a92d6949bb6d1c4 (patch) | |
tree | 7f146f266d74d4a788309bc141c99282d68bd1c2 /drivers/gpu/drm/drm_modes.c | |
parent | ee2762916f5594e60d8789593f149ed83b560cf7 (diff) | |
download | linux-04fee895ef98ffbb91a941b53a92d6949bb6d1c4.tar.xz |
DRM: clean up and document parsing of video= parameter
The video= parameter of the DRM drivers supports some additional flags that
the normal fb drivers do not have. They also allow to limit these flags to
specific outputs. Both things were previously undocumented.
Also the parsing of the line had some oddities:
-A lot of misplaced options were silently ignored or partly rejected instead
of stopping the parsing immediately
-The 'R' option is documented to follow the 'M' option if specified. It is not
documented that 'M' is needed to specify 'R' (also this is the case for normal
fb drivers). In fact the code is correct for normal fb drivers but wrong for
DRM ones.
The old code allowed 'R' only _before_ 'M' (since it parses backwards) and only
if 'M' is given at all which is not needed for the DRM drivers.
-the margins option ('m') was parsed but later ignored even if the later
functions support it.
-specifying multiple enable options at the same time did not lead to an error.
-specifying something bogus for horizontal resolution (i.e. other things as
digits) did not lead to an error but an invalid resolution was used.
If any errors are encountered the position of the faulting string is now
printed to the user and the complete mode is ignored. This gives much
more consistent error behaviour.
I also removed some useless assignments and changed the local flag variables
to be bool.
Signed-off-by: Rolf Eike Beer <eike-kernel@sf-tec.de>
Signed-off-by: Dave Airlie <airlied@redhat.com>
Diffstat (limited to 'drivers/gpu/drm/drm_modes.c')
-rw-r--r-- | drivers/gpu/drm/drm_modes.c | 87 |
1 files changed, 60 insertions, 27 deletions
diff --git a/drivers/gpu/drm/drm_modes.c b/drivers/gpu/drm/drm_modes.c index c2d32f2..ad74fb4 100644 --- a/drivers/gpu/drm/drm_modes.c +++ b/drivers/gpu/drm/drm_modes.c @@ -994,9 +994,10 @@ bool drm_mode_parse_command_line_for_connector(const char *mode_option, { const char *name; unsigned int namelen; - int res_specified = 0, bpp_specified = 0, refresh_specified = 0; + bool res_specified = false, bpp_specified = false, refresh_specified = false; unsigned int xres = 0, yres = 0, bpp = 32, refresh = 0; - int yres_specified = 0, cvt = 0, rb = 0, interlace = 0, margins = 0; + bool yres_specified = false, cvt = false, rb = false; + bool interlace = false, margins = false, was_digit = false; int i; enum drm_connector_force force = DRM_FORCE_UNSPECIFIED; @@ -1015,54 +1016,65 @@ bool drm_mode_parse_command_line_for_connector(const char *mode_option, for (i = namelen-1; i >= 0; i--) { switch (name[i]) { case '@': - namelen = i; if (!refresh_specified && !bpp_specified && - !yres_specified) { + !yres_specified && !cvt && !rb && was_digit) { refresh = simple_strtol(&name[i+1], NULL, 10); - refresh_specified = 1; - if (cvt || rb) - cvt = 0; + refresh_specified = true; + was_digit = false; } else goto done; break; case '-': - namelen = i; - if (!bpp_specified && !yres_specified) { + if (!bpp_specified && !yres_specified && !cvt && + !rb && was_digit) { bpp = simple_strtol(&name[i+1], NULL, 10); - bpp_specified = 1; - if (cvt || rb) - cvt = 0; + bpp_specified = true; + was_digit = false; } else goto done; break; case 'x': - if (!yres_specified) { + if (!yres_specified && was_digit) { yres = simple_strtol(&name[i+1], NULL, 10); - yres_specified = 1; + yres_specified = true; + was_digit = false; } else goto done; case '0' ... '9': + was_digit = true; break; case 'M': - if (!yres_specified) - cvt = 1; + if (yres_specified || cvt || was_digit) + goto done; + cvt = true; break; case 'R': - if (cvt) - rb = 1; + if (yres_specified || cvt || rb || was_digit) + goto done; + rb = true; break; case 'm': - if (!cvt) - margins = 1; + if (cvt || yres_specified || was_digit) + goto done; + margins = true; break; case 'i': - if (!cvt) - interlace = 1; + if (cvt || yres_specified || was_digit) + goto done; + interlace = true; break; case 'e': + if (yres_specified || bpp_specified || refresh_specified || + was_digit || (force != DRM_FORCE_UNSPECIFIED)) + goto done; + force = DRM_FORCE_ON; break; case 'D': + if (yres_specified || bpp_specified || refresh_specified || + was_digit || (force != DRM_FORCE_UNSPECIFIED)) + goto done; + if ((connector->connector_type != DRM_MODE_CONNECTOR_DVII) && (connector->connector_type != DRM_MODE_CONNECTOR_HDMIB)) force = DRM_FORCE_ON; @@ -1070,17 +1082,37 @@ bool drm_mode_parse_command_line_for_connector(const char *mode_option, force = DRM_FORCE_ON_DIGITAL; break; case 'd': + if (yres_specified || bpp_specified || refresh_specified || + was_digit || (force != DRM_FORCE_UNSPECIFIED)) + goto done; + force = DRM_FORCE_OFF; break; default: goto done; } } + if (i < 0 && yres_specified) { - xres = simple_strtol(name, NULL, 10); - res_specified = 1; + char *ch; + xres = simple_strtol(name, &ch, 10); + if ((ch != NULL) && (*ch == 'x')) + res_specified = true; + else + i = ch - name; + } else if (!yres_specified && was_digit) { + /* catch mode that begins with digits but has no 'x' */ + i = 0; } done: + if (i >= 0) { + printk(KERN_WARNING + "parse error at position %i in video mode '%s'\n", + i, name); + mode->specified = false; + return false; + } + if (res_specified) { mode->specified = true; mode->xres = xres; @@ -1096,9 +1128,10 @@ done: mode->bpp_specified = true; mode->bpp = bpp; } - mode->rb = rb ? true : false; - mode->cvt = cvt ? true : false; - mode->interlace = interlace ? true : false; + mode->rb = rb; + mode->cvt = cvt; + mode->interlace = interlace; + mode->margins = margins; mode->force = force; return true; |