From patchwork Fri Oct 24 12:58:12 2014 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Laurent Pinchart X-Patchwork-Id: 5147231 Return-Path: X-Original-To: patchwork-linux-sh@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork1.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.19.201]) by patchwork1.web.kernel.org (Postfix) with ESMTP id E26749FD27 for ; Fri, 24 Oct 2014 12:58:30 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id 0418320265 for ; Fri, 24 Oct 2014 12:58:30 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 1CDB920268 for ; Fri, 24 Oct 2014 12:58:29 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756608AbaJXM6Y (ORCPT ); Fri, 24 Oct 2014 08:58:24 -0400 Received: from galahad.ideasonboard.com ([185.26.127.97]:44901 "EHLO galahad.ideasonboard.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756603AbaJXM6X (ORCPT ); Fri, 24 Oct 2014 08:58:23 -0400 Received: from avalon.ideasonboard.com (dsl-hkibrasgw3-50ddcc-40.dhcp.inet.fi [80.221.204.40]) by galahad.ideasonboard.com (Postfix) with ESMTPSA id DFDE2223CB; Fri, 24 Oct 2014 14:56:19 +0200 (CEST) From: Laurent Pinchart To: dri-devel@lists.freedesktop.org Cc: linux-sh@vger.kernel.org, Lars-Peter Clausen Subject: [PATCH v2 6/9] drm: Decouple EDID parsing from I2C adapter Date: Fri, 24 Oct 2014 15:58:12 +0300 Message-Id: <1414155495-3979-7-git-send-email-laurent.pinchart+renesas@ideasonboard.com> X-Mailer: git-send-email 2.0.4 In-Reply-To: <1414155495-3979-1-git-send-email-laurent.pinchart+renesas@ideasonboard.com> References: <1414155495-3979-1-git-send-email-laurent.pinchart+renesas@ideasonboard.com> Sender: linux-sh-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-sh@vger.kernel.org X-Spam-Status: No, score=-8.3 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_HI, RP_MATCHES_RCVD, UNPARSEABLE_RELAY autolearn=ham version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP From: Lars-Peter Clausen The drm_get_edid() function performs direct I2C accesses to read EDID blocks, assuming that the monitor DDC interface is directly connected to the I2C bus. It can't thus be used with HDMI encoders that control the DDC bus and expose EDID blocks through a different interface. Refactor drm_do_get_edid() to take a block read callback function instead of an I2C adapter, and export it for direct use by drivers. Signed-off-by: Lars-Peter Clausen Signed-off-by: Laurent Pinchart --- drivers/gpu/drm/drm_edid.c | 26 +++++++++++++------------- include/drm/drm_edid.h | 4 ++++ 2 files changed, 17 insertions(+), 13 deletions(-) diff --git a/drivers/gpu/drm/drm_edid.c b/drivers/gpu/drm/drm_edid.c index 3bf999134bcc..906809380c66 100644 --- a/drivers/gpu/drm/drm_edid.c +++ b/drivers/gpu/drm/drm_edid.c @@ -1125,9 +1125,9 @@ EXPORT_SYMBOL(drm_edid_is_valid); * Return: 0 on success or -1 on failure. */ static int -drm_do_probe_ddc_edid(struct i2c_adapter *adapter, unsigned char *buf, - int block, int len) +drm_do_probe_ddc_edid(void *data, u8 *buf, unsigned int block, size_t len) { + struct i2c_adapter *adapter = data; unsigned char start = block * EDID_LENGTH; unsigned char segment = block >> 1; unsigned char xfers = segment ? 3 : 2; @@ -1184,8 +1184,9 @@ static bool drm_edid_is_zero(u8 *in_edid, int length) return true; } -static u8 * -drm_do_get_edid(struct drm_connector *connector, struct i2c_adapter *adapter) +struct edid *drm_do_get_edid(struct drm_connector *connector, + int (*get_edid_block)(void *, u8 *buf, unsigned int, size_t), + void *data) { int i, j = 0, valid_extensions = 0; u8 *block, *new; @@ -1196,7 +1197,7 @@ drm_do_get_edid(struct drm_connector *connector, struct i2c_adapter *adapter) /* base block fetch */ for (i = 0; i < 4; i++) { - if (drm_do_probe_ddc_edid(adapter, block, 0, EDID_LENGTH)) + if (get_edid_block(data, block, 0, EDID_LENGTH)) goto out; if (drm_edid_block_valid(block, 0, print_bad_edid)) break; @@ -1210,7 +1211,7 @@ drm_do_get_edid(struct drm_connector *connector, struct i2c_adapter *adapter) /* if there's no extensions, we're done */ if (block[0x7e] == 0) - return block; + return (struct edid *)block; new = krealloc(block, (block[0x7e] + 1) * EDID_LENGTH, GFP_KERNEL); if (!new) @@ -1219,7 +1220,7 @@ drm_do_get_edid(struct drm_connector *connector, struct i2c_adapter *adapter) for (j = 1; j <= block[0x7e]; j++) { for (i = 0; i < 4; i++) { - if (drm_do_probe_ddc_edid(adapter, + if (get_edid_block(data, block + (valid_extensions + 1) * EDID_LENGTH, j, EDID_LENGTH)) goto out; @@ -1247,7 +1248,7 @@ drm_do_get_edid(struct drm_connector *connector, struct i2c_adapter *adapter) block = new; } - return block; + return (struct edid *)block; carp: if (print_bad_edid) { @@ -1260,6 +1261,7 @@ out: kfree(block); return NULL; } +EXPORT_SYMBOL_GPL(drm_do_get_edid); /** * drm_probe_ddc() - probe DDC presence @@ -1289,12 +1291,10 @@ EXPORT_SYMBOL(drm_probe_ddc); struct edid *drm_get_edid(struct drm_connector *connector, struct i2c_adapter *adapter) { - struct edid *edid = NULL; - - if (drm_probe_ddc(adapter)) - edid = (struct edid *)drm_do_get_edid(connector, adapter); + if (!drm_probe_ddc(adapter)) + return NULL; - return edid; + return drm_do_get_edid(connector, drm_do_probe_ddc_edid, adapter); } EXPORT_SYMBOL(drm_get_edid); diff --git a/include/drm/drm_edid.h b/include/drm/drm_edid.h index b96031d947a0..bcf05ef0caf8 100644 --- a/include/drm/drm_edid.h +++ b/include/drm/drm_edid.h @@ -279,4 +279,8 @@ int drm_hdmi_vendor_infoframe_from_display_mode(struct hdmi_vendor_infoframe *frame, const struct drm_display_mode *mode); +struct edid *drm_do_get_edid(struct drm_connector *connector, + int (*get_edid_block)(void *, u8 *buf, unsigned int, size_t), + void *data); + #endif /* __DRM_EDID_H__ */