From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from gabe.freedesktop.org (gabe.freedesktop.org [131.252.210.177]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 5AC81C4829E for ; Thu, 15 Feb 2024 14:09:49 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id AB0D010E6B8; Thu, 15 Feb 2024 14:09:43 +0000 (UTC) Authentication-Results: gabe.freedesktop.org; dkim=pass (2048-bit key; unprotected) header.d=intel.com header.i=@intel.com header.b="fYYFyqNY"; dkim-atps=neutral Received: from mgamail.intel.com (mgamail.intel.com [192.198.163.15]) by gabe.freedesktop.org (Postfix) with ESMTPS id 81CBC10E435; Thu, 15 Feb 2024 14:09:41 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1708006182; x=1739542182; h=from:to:cc:subject:in-reply-to:references:date: message-id:mime-version; bh=ZK2umLioglf89yU9tmbEroOx64HCpi4rqovNuj54BBE=; b=fYYFyqNYcy/dvE2wayy0FXaAqRDDp2oPB4s+4Jy0QBEtZlF5k6DeiHcO ZoGuxNQwpUh7ZzuIOdCJxBQufDUfLDn1gwF9i+zb0ai0DwbNfHG2Jhw2p 3f4GbRLefy6WSq/48WWNxj7lqsrlS+gIvxeX/NAVjkKTbCcFyLAXgjVS8 f/LfgHozhyB7mCiVlbZF9L2Ah8xkMcNnxFwvCYZuawuE+kV+yRufnWtF9 N2DGQZHsWXrQ57lX3K1N9pG7um/IIi6v6aGfTUSrSlIHPN+fEtNe22IUe RMLtXazBkdp4S6XaYeVMQX6eKB/oqOhx8s52Jd/fAYdww2u9sxgOMbXa7 A==; X-IronPort-AV: E=McAfee;i="6600,9927,10984"; a="2218644" X-IronPort-AV: E=Sophos;i="6.06,161,1705392000"; d="scan'208";a="2218644" Received: from fmviesa004.fm.intel.com ([10.60.135.144]) by fmvoesa109.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 15 Feb 2024 06:09:41 -0800 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.06,161,1705392000"; d="scan'208";a="8175597" Received: from kraszkow-mobl1.ger.corp.intel.com (HELO localhost) ([10.252.44.13]) by fmviesa004-auth.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 15 Feb 2024 06:09:36 -0800 From: Jani Nikula To: Mario Limonciello , Daniel Vetter , Alex Deucher , Hans de Goede , "open list:DRM DRIVERS" Cc: amd-gfx@lists.freedesktop.org, "open list:USB SUBSYSTEM" , linux-fbdev@vger.kernel.org, nouveau@lists.freedesktop.org, intel-gfx@lists.freedesktop.org, platform-driver-x86@vger.kernel.org, intel-xe@lists.freedesktop.org, linux-renesas-soc@vger.kernel.org, "open list:ACPI" , open list , Melissa Wen , Mark Pearson , Mario Limonciello Subject: Re: [PATCH v6 3/5] drm: Add support to get EDID from ACPI In-Reply-To: <20240214215756.6530-4-mario.limonciello@amd.com> Organization: Intel Finland Oy - BIC 0357606-4 - Westendinkatu 7, 02160 Espoo References: <20240214215756.6530-1-mario.limonciello@amd.com> <20240214215756.6530-4-mario.limonciello@amd.com> Date: Thu, 15 Feb 2024 16:09:33 +0200 Message-ID: <87a5o16cpu.fsf@intel.com> MIME-Version: 1.0 Content-Type: text/plain X-BeenThere: dri-devel@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Direct Rendering Infrastructure - Development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" On Wed, 14 Feb 2024, Mario Limonciello wrote: > Some manufacturers have intentionally put an EDID that differs from > the EDID on the internal panel on laptops. Drivers that prefer to > fetch this EDID can set a bit on the drm_connector to indicate that > the DRM EDID helpers should try to fetch it and it is preferred if > it's present. I just replied to a previous version of the patch [1]. Looks like all the comments there still hold. BR, Jani. [1] https://lore.kernel.org/r/87eddd6d41.fsf@intel.com > > Signed-off-by: Mario Limonciello > --- > drivers/gpu/drm/Kconfig | 1 + > drivers/gpu/drm/drm_edid.c | 109 +++++++++++++++++++++++++++++++++--- > include/drm/drm_connector.h | 6 ++ > include/drm/drm_edid.h | 1 + > 4 files changed, 109 insertions(+), 8 deletions(-) > > diff --git a/drivers/gpu/drm/Kconfig b/drivers/gpu/drm/Kconfig > index 872edb47bb53..3db89e6af01d 100644 > --- a/drivers/gpu/drm/Kconfig > +++ b/drivers/gpu/drm/Kconfig > @@ -8,6 +8,7 @@ > menuconfig DRM > tristate "Direct Rendering Manager (XFree86 4.1.0 and higher DRI support)" > depends on (AGP || AGP=n) && !EMULATED_CMPXCHG && HAS_DMA > + depends on (ACPI_VIDEO || ACPI_VIDEO=n) > select DRM_PANEL_ORIENTATION_QUIRKS > select DRM_KMS_HELPER if DRM_FBDEV_EMULATION > select FB_CORE if DRM_FBDEV_EMULATION > diff --git a/drivers/gpu/drm/drm_edid.c b/drivers/gpu/drm/drm_edid.c > index 923c4423151c..cdc30c6d05d5 100644 > --- a/drivers/gpu/drm/drm_edid.c > +++ b/drivers/gpu/drm/drm_edid.c > @@ -28,6 +28,7 @@ > * DEALINGS IN THE SOFTWARE. > */ > > +#include > #include > #include > #include > @@ -2188,6 +2189,58 @@ drm_do_probe_ddc_edid(void *data, u8 *buf, unsigned int block, size_t len) > return ret == xfers ? 0 : -1; > } > > +/** > + * drm_do_probe_acpi_edid() - get EDID information via ACPI _DDC > + * @data: struct drm_connector > + * @buf: EDID data buffer to be filled > + * @block: 128 byte EDID block to start fetching from > + * @len: EDID data buffer length to fetch > + * > + * Try to fetch EDID information by calling acpi_video_get_edid() function. > + * > + * Return: 0 on success or error code on failure. > + */ > +static int > +drm_do_probe_acpi_edid(void *data, u8 *buf, unsigned int block, size_t len) > +{ > + struct drm_connector *connector = data; > + struct drm_device *ddev = connector->dev; > + struct acpi_device *acpidev = ACPI_COMPANION(ddev->dev); > + unsigned char start = block * EDID_LENGTH; > + void *edid; > + int r; > + > + if (!acpidev) > + return -ENODEV; > + > + switch (connector->connector_type) { > + case DRM_MODE_CONNECTOR_LVDS: > + case DRM_MODE_CONNECTOR_eDP: > + break; > + default: > + return -EINVAL; > + } > + > + /* fetch the entire edid from BIOS */ > + r = acpi_video_get_edid(acpidev, ACPI_VIDEO_DISPLAY_LCD, -1, &edid); > + if (r < 0) { > + DRM_DEBUG_KMS("Failed to get EDID from ACPI: %d\n", r); > + return r; > + } > + if (len > r || start > r || start + len > r) { > + r = -EINVAL; > + goto cleanup; > + } > + > + memcpy(buf, edid + start, len); > + r = 0; > + > +cleanup: > + kfree(edid); > + > + return r; > +} > + > static void connector_bad_edid(struct drm_connector *connector, > const struct edid *edid, int num_blocks) > { > @@ -2621,7 +2674,8 @@ EXPORT_SYMBOL(drm_probe_ddc); > * @connector: connector we're probing > * @adapter: I2C adapter to use for DDC > * > - * Poke the given I2C channel to grab EDID data if possible. If found, > + * If the connector allows it, try to fetch EDID data using ACPI. If not found > + * poke the given I2C channel to grab EDID data if possible. If found, > * attach it to the connector. > * > * Return: Pointer to valid EDID or NULL if we couldn't find any. > @@ -2629,20 +2683,50 @@ EXPORT_SYMBOL(drm_probe_ddc); > struct edid *drm_get_edid(struct drm_connector *connector, > struct i2c_adapter *adapter) > { > - struct edid *edid; > + struct edid *edid = NULL; > > if (connector->force == DRM_FORCE_OFF) > return NULL; > > - if (connector->force == DRM_FORCE_UNSPECIFIED && !drm_probe_ddc(adapter)) > - return NULL; > + if (connector->acpi_edid_allowed) > + edid = _drm_do_get_edid(connector, drm_do_probe_acpi_edid, connector, NULL); > + > + if (!edid) { > + if (connector->force == DRM_FORCE_UNSPECIFIED && !drm_probe_ddc(adapter)) > + return NULL; > + edid = _drm_do_get_edid(connector, drm_do_probe_ddc_edid, adapter, NULL); > + } > > - edid = _drm_do_get_edid(connector, drm_do_probe_ddc_edid, adapter, NULL); > drm_connector_update_edid_property(connector, edid); > return edid; > } > EXPORT_SYMBOL(drm_get_edid); > > +/** > + * drm_edid_read_acpi - get EDID data, if available > + * @connector: connector we're probing > + * > + * Use the BIOS to attempt to grab EDID data if possible. > + * > + * The returned pointer must be freed using drm_edid_free(). > + * > + * Return: Pointer to valid EDID or NULL if we couldn't find any. > + */ > +const struct drm_edid *drm_edid_read_acpi(struct drm_connector *connector) > +{ > + const struct drm_edid *drm_edid; > + > + if (connector->force == DRM_FORCE_OFF) > + return NULL; > + > + drm_edid = drm_edid_read_custom(connector, drm_do_probe_acpi_edid, connector); > + > + /* Note: Do *not* call connector updates here. */ > + > + return drm_edid; > +} > +EXPORT_SYMBOL(drm_edid_read_acpi); > + > /** > * drm_edid_read_custom - Read EDID data using given EDID block read function > * @connector: Connector to use > @@ -2727,10 +2811,11 @@ const struct drm_edid *drm_edid_read_ddc(struct drm_connector *connector, > EXPORT_SYMBOL(drm_edid_read_ddc); > > /** > - * drm_edid_read - Read EDID data using connector's I2C adapter > + * drm_edid_read - Read EDID data using BIOS or connector's I2C adapter > * @connector: Connector to use > * > - * Read EDID using the connector's I2C adapter. > + * Read EDID from BIOS if allowed by connector or by using the connector's > + * I2C adapter. > * > * The EDID may be overridden using debugfs override_edid or firmware EDID > * (drm_edid_load_firmware() and drm.edid_firmware parameter), in this priority > @@ -2742,10 +2827,18 @@ EXPORT_SYMBOL(drm_edid_read_ddc); > */ > const struct drm_edid *drm_edid_read(struct drm_connector *connector) > { > + const struct drm_edid *drm_edid = NULL; > + > if (drm_WARN_ON(connector->dev, !connector->ddc)) > return NULL; > > - return drm_edid_read_ddc(connector, connector->ddc); > + if (connector->acpi_edid_allowed) > + drm_edid = drm_edid_read_acpi(connector); > + > + if (!drm_edid) > + drm_edid = drm_edid_read_ddc(connector, connector->ddc); > + > + return drm_edid; > } > EXPORT_SYMBOL(drm_edid_read); > > diff --git a/include/drm/drm_connector.h b/include/drm/drm_connector.h > index fe88d7fc6b8f..74ed47f37a69 100644 > --- a/include/drm/drm_connector.h > +++ b/include/drm/drm_connector.h > @@ -1886,6 +1886,12 @@ struct drm_connector { > > /** @hdr_sink_metadata: HDR Metadata Information read from sink */ > struct hdr_sink_metadata hdr_sink_metadata; > + > + /** > + * @acpi_edid_allowed: Get the EDID from the BIOS, if available. > + * This is only applicable to eDP and LVDS displays. > + */ > + bool acpi_edid_allowed; > }; > > #define obj_to_connector(x) container_of(x, struct drm_connector, base) > diff --git a/include/drm/drm_edid.h b/include/drm/drm_edid.h > index 7923bc00dc7a..1c1ee927de9c 100644 > --- a/include/drm/drm_edid.h > +++ b/include/drm/drm_edid.h > @@ -459,5 +459,6 @@ bool drm_edid_is_digital(const struct drm_edid *drm_edid); > > const u8 *drm_find_edid_extension(const struct drm_edid *drm_edid, > int ext_id, int *ext_index); > +const struct drm_edid *drm_edid_read_acpi(struct drm_connector *connector); > > #endif /* __DRM_EDID_H__ */ -- Jani Nikula, Intel