From patchwork Tue Sep 14 20:21:49 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Doug Anderson X-Patchwork-Id: 12494611 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-19.1 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER,INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 76CF8C43219 for ; Tue, 14 Sep 2021 20:22:25 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 5A3D06117A for ; Tue, 14 Sep 2021 20:22:25 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233904AbhINUXk (ORCPT ); Tue, 14 Sep 2021 16:23:40 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:37622 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233398AbhINUXi (ORCPT ); Tue, 14 Sep 2021 16:23:38 -0400 Received: from mail-pj1-x102a.google.com (mail-pj1-x102a.google.com [IPv6:2607:f8b0:4864:20::102a]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 8DE95C061762 for ; Tue, 14 Sep 2021 13:22:20 -0700 (PDT) Received: by mail-pj1-x102a.google.com with SMTP id w19-20020a17090aaf9300b00191e6d10a19so534162pjq.1 for ; Tue, 14 Sep 2021 13:22:20 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=chromium.org; s=google; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=1eq1EhU+zYDo9mJHJDkG29Ky8UkHJSuUomIxtnQFNyU=; b=DbJEGg0xGwg+a49SFAxYOlo+UGjg3cC7kW+wHLhkk+opC8xZLjO4mXNmBmLN/sgtz4 3hCnSMgXi69PYfleT76+M+3GA9R2GRilBRHJLtDCgx3qOIWsMo+XJolkbO5j0Tp9AmyK AAfrHllQnojGW3KNEsEIKeY2DW5KA104z4sII= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=1eq1EhU+zYDo9mJHJDkG29Ky8UkHJSuUomIxtnQFNyU=; b=sZeyePJ3IX4idy1CIKttPsIhofht47sMq/o6ukVkikd77BZA5nEzXho+ppqOGbS/VW BXRYNnRmkwuc3nUPmQpGGV7ld5O1XXr1Ko54v9O9oej/JB/Vr32N3GowS0G9umY8DnKq uT35GIaXJXqlNSREh7lwXlCHG6n2B8bFDcfBUSMuxnN/1n4CBbv0tByBd+Axt3uqPa9T +1JkDPMWoTav2L7ktq5QqvN7ohQQEm14m/wq9QllnKFu6hJTUg9hXtexO6LdTOKqTcj6 r8MWsof0ADziv/OOe9r+Xr6XWWKLZjRGWY2NaoIaQnJIO5kaGINhyOM1Qq9+kebthIv1 ehMQ== X-Gm-Message-State: AOAM533HDLaTvtE4Yd2tUUlH0Cds8vLLwQwejVmN2y9soIzMFzvhPOha 1Q4xG2dTmHSBghhahWN3+HiMkw== X-Google-Smtp-Source: ABdhPJxZGuqeY7vVGYlZZdjz3TXxrq4Z8aVX1sSURyw7T47gpo2DGYj+w1EEfxevLORoECmy387ikA== X-Received: by 2002:a17:90b:3ec6:: with SMTP id rm6mr4119831pjb.68.1631650940174; Tue, 14 Sep 2021 13:22:20 -0700 (PDT) Received: from tictac2.mtv.corp.google.com ([2620:15c:202:201:f38f:9d0f:3eba:f8c4]) by smtp.gmail.com with ESMTPSA id 141sm12185393pgg.16.2021.09.14.13.22.18 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 14 Sep 2021 13:22:19 -0700 (PDT) From: Douglas Anderson To: Thierry Reding , Rob Herring , Sam Ravnborg Cc: devicetree@vger.kernel.org, Steev Klimaszewski , dri-devel@lists.freedesktop.org, linux-arm-msm@vger.kernel.org, David Airlie , Maarten Lankhorst , Thomas Zimmermann , Linus W , Bjorn Andersson , Daniel Vetter , Maxime Ripard , Douglas Anderson , Jani Nikula , linux-kernel@vger.kernel.org Subject: [PATCH v5 02/15] drm/edid: Break out reading block 0 of the EDID Date: Tue, 14 Sep 2021 13:21:49 -0700 Message-Id: <20210914132020.v5.2.I62e76a034ac78c994d40a23cd4ec5aeee56fa77c@changeid> X-Mailer: git-send-email 2.33.0.309.g3052b89438-goog In-Reply-To: <20210914202202.1702601-1-dianders@chromium.org> References: <20210914202202.1702601-1-dianders@chromium.org> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-arm-msm@vger.kernel.org A future change wants to be able to read just block 0 of the EDID, so break it out of drm_do_get_edid() into a sub-function. This is intended to be a no-op change--just code movement. Signed-off-by: Douglas Anderson Acked-by: Sam Ravnborg Reviewed-by: Jani Nikula --- (no changes since v4) Changes in v4: - "u8 *edid" => "void *edid" to avoid cast. - Don't put kmalloc() in the "if" test even if the old code did. - drm_do_get_edid_blk0() => drm_do_get_edid_base_block() drivers/gpu/drm/drm_edid.c | 63 +++++++++++++++++++++++++++----------- 1 file changed, 45 insertions(+), 18 deletions(-) diff --git a/drivers/gpu/drm/drm_edid.c b/drivers/gpu/drm/drm_edid.c index 6325877c5fd6..520fe1391769 100644 --- a/drivers/gpu/drm/drm_edid.c +++ b/drivers/gpu/drm/drm_edid.c @@ -1905,6 +1905,44 @@ int drm_add_override_edid_modes(struct drm_connector *connector) } EXPORT_SYMBOL(drm_add_override_edid_modes); +static struct edid *drm_do_get_edid_base_block( + int (*get_edid_block)(void *data, u8 *buf, unsigned int block, + size_t len), + void *data, bool *edid_corrupt, int *null_edid_counter) +{ + int i; + void *edid; + + edid = kmalloc(EDID_LENGTH, GFP_KERNEL); + if (edid == NULL) + return NULL; + + /* base block fetch */ + for (i = 0; i < 4; i++) { + if (get_edid_block(data, edid, 0, EDID_LENGTH)) + goto out; + if (drm_edid_block_valid(edid, 0, false, edid_corrupt)) + break; + if (i == 0 && drm_edid_is_zero(edid, EDID_LENGTH)) { + if (null_edid_counter) + (*null_edid_counter)++; + goto carp; + } + } + if (i == 4) + goto carp; + + return edid; + +carp: + kfree(edid); + return ERR_PTR(-EINVAL); + +out: + kfree(edid); + return NULL; +} + /** * drm_do_get_edid - get EDID data using a custom EDID block read function * @connector: connector we're probing @@ -1938,25 +1976,16 @@ struct edid *drm_do_get_edid(struct drm_connector *connector, if (override) return override; - if ((edid = kmalloc(EDID_LENGTH, GFP_KERNEL)) == NULL) + edid = (u8 *)drm_do_get_edid_base_block(get_edid_block, data, + &connector->edid_corrupt, + &connector->null_edid_counter); + if (IS_ERR_OR_NULL(edid)) { + if (IS_ERR(edid)) + connector_bad_edid(connector, edid, 1); return NULL; - - /* base block fetch */ - for (i = 0; i < 4; i++) { - if (get_edid_block(data, edid, 0, EDID_LENGTH)) - goto out; - if (drm_edid_block_valid(edid, 0, false, - &connector->edid_corrupt)) - break; - if (i == 0 && drm_edid_is_zero(edid, EDID_LENGTH)) { - connector->null_edid_counter++; - goto carp; - } } - if (i == 4) - goto carp; - /* if there's no extensions, we're done */ + /* if there's no extensions or no connector, we're done */ valid_extensions = edid[0x7e]; if (valid_extensions == 0) return (struct edid *)edid; @@ -2010,8 +2039,6 @@ struct edid *drm_do_get_edid(struct drm_connector *connector, return (struct edid *)edid; -carp: - connector_bad_edid(connector, edid, 1); out: kfree(edid); return NULL;