From patchwork Thu Apr 11 13:22:39 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Maxime Ripard X-Patchwork-Id: 10895997 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id A73DB14DB for ; Thu, 11 Apr 2019 13:22:57 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 8C7882015F for ; Thu, 11 Apr 2019 13:22:57 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 80CE728C78; Thu, 11 Apr 2019 13:22:57 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-5.2 required=2.0 tests=BAYES_00,MAILING_LIST_MULTI, RCVD_IN_DNSWL_MED autolearn=ham version=3.3.1 Received: from gabe.freedesktop.org (gabe.freedesktop.org [131.252.210.177]) (using TLSv1.2 with cipher DHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.wl.linuxfoundation.org (Postfix) with ESMTPS id CD8BB28D69 for ; Thu, 11 Apr 2019 13:22:56 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id E9AA58984E; Thu, 11 Apr 2019 13:22:54 +0000 (UTC) X-Original-To: dri-devel@lists.freedesktop.org Delivered-To: dri-devel@lists.freedesktop.org Received: from relay5-d.mail.gandi.net (relay5-d.mail.gandi.net [217.70.183.197]) by gabe.freedesktop.org (Postfix) with ESMTPS id 36F098984E for ; Thu, 11 Apr 2019 13:22:53 +0000 (UTC) X-Originating-IP: 90.88.18.121 Received: from localhost (aaubervilliers-681-1-63-121.w90-88.abo.wanadoo.fr [90.88.18.121]) (Authenticated sender: maxime.ripard@bootlin.com) by relay5-d.mail.gandi.net (Postfix) with ESMTPSA id 3B2C31C0009; Thu, 11 Apr 2019 13:22:48 +0000 (UTC) From: Maxime Ripard To: Maarten Lankhorst , Sean Paul , Maxime Ripard , Daniel Vetter , David Airlie Subject: [PATCH v2 1/5] drm/modes: Rewrite the command line parser Date: Thu, 11 Apr 2019 15:22:39 +0200 Message-Id: <9996c66f335786fb6c5396dacfa35b40587a2365.1554988934.git-series.maxime.ripard@bootlin.com> X-Mailer: git-send-email 2.21.0 In-Reply-To: References: MIME-Version: 1.0 X-BeenThere: dri-devel@lists.freedesktop.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: Direct Rendering Infrastructure - Development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: eben@raspberrypi.org, dri-devel@lists.freedesktop.org, Paul Kocialkowski , Thomas Petazzoni , Maxime Ripard , linux-arm-kernel@lists.infradead.org Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" X-Virus-Scanned: ClamAV using ClamSMTP From: Maxime Ripard Rewrite the command line parser in order to get away from the state machine parsing the video mode lines. Hopefully, this will allow to extend it more easily to support named modes and / or properties set directly on the command line. Signed-off-by: Maxime Ripard --- drivers/gpu/drm/drm_modes.c | 308 +++++++++++++++++++++++-------------- 1 file changed, 193 insertions(+), 115 deletions(-) diff --git a/drivers/gpu/drm/drm_modes.c b/drivers/gpu/drm/drm_modes.c index 56f92a0bba62..bbacb7743f3b 100644 --- a/drivers/gpu/drm/drm_modes.c +++ b/drivers/gpu/drm/drm_modes.c @@ -30,6 +30,7 @@ * authorization from the copyright holder(s) and author(s). */ +#include #include #include #include @@ -1405,6 +1406,131 @@ void drm_connector_list_update(struct drm_connector *connector) } EXPORT_SYMBOL(drm_connector_list_update); +static int drm_mode_parse_cmdline_bpp(const char *str, char **end_ptr, + struct drm_cmdline_mode *mode) +{ + if (str[0] != '-') + return -EINVAL; + + mode->bpp = simple_strtol(str + 1, end_ptr, 10); + mode->bpp_specified = true; + + return 0; +} + +static int drm_mode_parse_cmdline_refresh(const char *str, char **end_ptr, + struct drm_cmdline_mode *mode) +{ + if (str[0] != '@') + return -EINVAL; + + mode->refresh = simple_strtol(str + 1, end_ptr, 10); + mode->refresh_specified = true; + + return 0; +} + +static int drm_mode_parse_cmdline_extra(const char *str, int length, + struct drm_connector *connector, + struct drm_cmdline_mode *mode) +{ + int i; + + for (i = 0; i < length; i++) { + switch (str[i]) { + case 'i': + mode->interlace = true; + break; + case 'm': + mode->margins = true; + break; + case 'D': + if (mode->force != DRM_FORCE_UNSPECIFIED) + return -EINVAL; + + if ((connector->connector_type != DRM_MODE_CONNECTOR_DVII) && + (connector->connector_type != DRM_MODE_CONNECTOR_HDMIB)) + mode->force = DRM_FORCE_ON; + else + mode->force = DRM_FORCE_ON_DIGITAL; + break; + case 'd': + if (mode->force != DRM_FORCE_UNSPECIFIED) + return -EINVAL; + + mode->force = DRM_FORCE_OFF; + break; + case 'e': + if (mode->force != DRM_FORCE_UNSPECIFIED) + return -EINVAL; + + mode->force = DRM_FORCE_ON; + break; + default: + return -EINVAL; + } + } + + return 0; +} + +static int drm_mode_parse_cmdline_res_mode(const char *str, unsigned int length, + bool extras, + struct drm_connector *connector, + struct drm_cmdline_mode *mode) +{ + bool rb = false, cvt = false; + int xres = 0, yres = 0; + int remaining, i; + char *end_ptr; + + xres = simple_strtol(str, &end_ptr, 10); + + if (end_ptr[0] != 'x') + return -EINVAL; + end_ptr++; + + yres = simple_strtol(end_ptr, &end_ptr, 10); + + remaining = length - (end_ptr - str); + if (remaining < 0) + return -EINVAL; + + for (i = 0; i < remaining; i++) { + switch (end_ptr[i]) { + case 'M': + cvt = true; + break; + case 'R': + rb = true; + break; + default: + /* + * Try to pass that to our extras parsing + * function to handle the case where the + * extras are directly after the resolution + */ + if (extras) { + int ret = drm_mode_parse_cmdline_extra(end_ptr + i, + 1, + connector, + mode); + if (ret) + return ret; + } else { + return -EINVAL; + } + } + } + + mode->xres = xres; + mode->yres = yres; + mode->cvt = cvt; + mode->rb = rb; + + return 0; +} + /** * drm_mode_parse_command_line_for_connector - parse command line modeline for connector * @mode_option: optional per connector mode option @@ -1431,13 +1557,12 @@ bool drm_mode_parse_command_line_for_connector(const char *mode_option, struct drm_cmdline_mode *mode) { const char *name; - unsigned int namelen; - bool res_specified = false, bpp_specified = false, refresh_specified = false; - unsigned int xres = 0, yres = 0, bpp = 32, refresh = 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; + bool parse_extras = false; + unsigned int bpp_off = 0, refresh_off = 0; + unsigned int mode_end = 0; + char *bpp_ptr = NULL, *refresh_ptr = NULL, *extra_ptr = NULL; + char *bpp_end_ptr = NULL, *refresh_end_ptr = NULL; + int ret; #ifdef CONFIG_FB if (!mode_option) @@ -1450,127 +1575,80 @@ bool drm_mode_parse_command_line_for_connector(const char *mode_option, } name = mode_option; - namelen = strlen(name); - for (i = namelen-1; i >= 0; i--) { - switch (name[i]) { - case '@': - if (!refresh_specified && !bpp_specified && - !yres_specified && !cvt && !rb && was_digit) { - refresh = simple_strtol(&name[i+1], NULL, 10); - refresh_specified = true; - was_digit = false; - } else - goto done; - break; - case '-': - if (!bpp_specified && !yres_specified && !cvt && - !rb && was_digit) { - bpp = simple_strtol(&name[i+1], NULL, 10); - bpp_specified = true; - was_digit = false; - } else - goto done; - break; - case 'x': - if (!yres_specified && was_digit) { - yres = simple_strtol(&name[i+1], NULL, 10); - yres_specified = true; - was_digit = false; - } else - goto done; - break; - case '0' ... '9': - was_digit = true; - break; - case 'M': - if (yres_specified || cvt || was_digit) - goto done; - cvt = true; - break; - case 'R': - if (yres_specified || cvt || rb || was_digit) - goto done; - rb = true; - break; - case 'm': - if (cvt || yres_specified || was_digit) - goto done; - margins = true; - break; - case 'i': - 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 (!isdigit(name[0])) + return false; - if ((connector->connector_type != DRM_MODE_CONNECTOR_DVII) && - (connector->connector_type != DRM_MODE_CONNECTOR_HDMIB)) - force = DRM_FORCE_ON; - else - force = DRM_FORCE_ON_DIGITAL; - break; - case 'd': - if (yres_specified || bpp_specified || refresh_specified || - was_digit || (force != DRM_FORCE_UNSPECIFIED)) - goto done; + /* Try to locate the bpp and refresh specifiers, if any */ + bpp_ptr = strchr(name, '-'); + if (bpp_ptr) { + bpp_off = bpp_ptr - name; + mode->bpp_specified = true; + } - force = DRM_FORCE_OFF; - break; - default: - goto done; - } + refresh_ptr = strchr(name, '@'); + if (refresh_ptr) { + if (named_mode) + return false; + + refresh_off = refresh_ptr - name; + mode->refresh_specified = true; } - if (i < 0 && yres_specified) { - 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; + /* 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) { + mode_end = bpp_off; + } else if (refresh_ptr) { + mode_end = refresh_off; + } else { + mode_end = strlen(name); + parse_extras = true; } -done: - if (i >= 0) { - pr_warn("[drm] parse error at position %i in video mode '%s'\n", - i, name); - mode->specified = false; + + ret = drm_mode_parse_cmdline_res_mode(name, mode_end, + parse_extras, + connector, + mode); + if (ret) return false; - } + mode->specified = true; - if (res_specified) { - mode->specified = true; - mode->xres = xres; - mode->yres = yres; + if (bpp_ptr) { + ret = drm_mode_parse_cmdline_bpp(bpp_ptr, &bpp_end_ptr, mode); + if (ret) + return false; } - if (refresh_specified) { - mode->refresh_specified = true; - mode->refresh = refresh; + if (refresh_ptr) { + ret = drm_mode_parse_cmdline_refresh(refresh_ptr, + &refresh_end_ptr, mode); + if (ret) + return false; } - if (bpp_specified) { - mode->bpp_specified = true; - mode->bpp = bpp; + /* + * Locate the end of the bpp / refresh, and parse the extras + * if relevant + */ + if (bpp_ptr && refresh_ptr) + extra_ptr = max(bpp_end_ptr, refresh_end_ptr); + else if (bpp_ptr) + extra_ptr = bpp_end_ptr; + else if (refresh_ptr) + extra_ptr = refresh_end_ptr; + + if (extra_ptr) { + int remaining = strlen(name) - (extra_ptr - name); + + /* + * We still have characters to process, while + * we shouldn't have any + */ + if (remaining > 0) + return false; } - mode->rb = rb; - mode->cvt = cvt; - mode->interlace = interlace; - mode->margins = margins; - mode->force = force; return true; }