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X-CSE-ConnectionGUID: 2ORZ1sVPRmu2iECIATA++A== X-CSE-MsgGUID: y9Ag7IJHSSeMejIlxfpe+Q== X-IronPort-AV: E=McAfee;i="6700,10204,11266"; a="32752376" X-IronPort-AV: E=Sophos;i="6.12,182,1728975600"; d="scan'208";a="32752376" Received: from orviesa005.jf.intel.com ([10.64.159.145]) by fmvoesa109.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 25 Nov 2024 01:45:13 -0800 X-CSE-ConnectionGUID: wyt/aj7uR6qy9lk/sV6QoQ== X-CSE-MsgGUID: +B+QqeZkT8C5sYLHFbcgTg== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.12,182,1728975600"; d="scan'208";a="96143804" Received: from klitkey1-mobl1.ger.corp.intel.com (HELO localhost) ([10.245.246.243]) by orviesa005-auth.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 25 Nov 2024 01:45:07 -0800 From: Jani Nikula To: Louis Chauvet , =?utf-8?Q?Ma=C3=ADra?= Canal , Haneen Mohammed , Simona Vetter , Melissa Wen , Maarten Lankhorst , Maxime Ripard , Thomas Zimmermann , David Airlie Cc: arthurgrillo@riseup.net, jeremie.dautheribes@bootlin.com, miquel.raynal@bootlin.com, thomas.petazzoni@bootlin.com, seanpaul@google.com, nicolejadeyee@google.com, linux-kernel@vger.kernel.org, dri-devel@lists.freedesktop.org, Louis Chauvet Subject: Re: [PATCH RFC v2 17/18] drm/vkms: Introduce config for connector EDID In-Reply-To: <20241122-google-remove-crtc-index-from-parameter-v2-17-81540742535a@bootlin.com> Organization: Intel Finland Oy - BIC 0357606-4 - Westendinkatu 7, 02160 Espoo References: <20241122-google-remove-crtc-index-from-parameter-v2-0-81540742535a@bootlin.com> <20241122-google-remove-crtc-index-from-parameter-v2-17-81540742535a@bootlin.com> Date: Mon, 25 Nov 2024 11:45:04 +0200 Message-ID: <87o723y7dr.fsf@intel.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain On Fri, 22 Nov 2024, Louis Chauvet wrote: > To properly test the EDID reading without using the DRM override, add an > option to configure the EDID for a connector. > > Signed-off-by: Louis Chauvet > --- > drivers/gpu/drm/vkms/vkms_config.c | 1 + > drivers/gpu/drm/vkms/vkms_config.h | 2 ++ > drivers/gpu/drm/vkms/vkms_output.c | 37 ++++++++++++++++++++++++++++++++++--- > 3 files changed, 37 insertions(+), 3 deletions(-) > > diff --git a/drivers/gpu/drm/vkms/vkms_config.c b/drivers/gpu/drm/vkms/vkms_config.c > index ac1a9658c5075c118d59da965ca3392355ccb2b2..1a1234d4f10fa8e5ea6bd649139ecc10c991f875 100644 > --- a/drivers/gpu/drm/vkms/vkms_config.c > +++ b/drivers/gpu/drm/vkms/vkms_config.c > @@ -199,6 +199,7 @@ struct vkms_config_connector *vkms_config_create_connector(struct vkms_config *v > xa_init_flags(&vkms_config_connector->possible_encoders, XA_FLAGS_ALLOC); > vkms_config_connector->type = DRM_MODE_CONNECTOR_VIRTUAL; > vkms_config_connector->status = connector_status_unknown; > + vkms_config_connector->edid_blob_len = 0; > > return vkms_config_connector; > } > diff --git a/drivers/gpu/drm/vkms/vkms_config.h b/drivers/gpu/drm/vkms/vkms_config.h > index bba56c9d8aeceac97a4339ef42ab663c5dc54e65..1220b16f6c98d1ebb0ae55d662a84fe25e1a6a02 100644 > --- a/drivers/gpu/drm/vkms/vkms_config.h > +++ b/drivers/gpu/drm/vkms/vkms_config.h > @@ -112,6 +112,8 @@ struct vkms_config_connector { > struct xarray possible_encoders; > int type; > enum drm_connector_status status; > + char edid_blob[PAGE_SIZE]; > + int edid_blob_len; > > /* Internal usage */ > struct drm_connector *connector; > diff --git a/drivers/gpu/drm/vkms/vkms_output.c b/drivers/gpu/drm/vkms/vkms_output.c > index fc6a0cdade0739b94820ed4e0924cf355137fe79..56590afb33d75465971d10a282040690840cdbee 100644 > --- a/drivers/gpu/drm/vkms/vkms_output.c > +++ b/drivers/gpu/drm/vkms/vkms_output.c > @@ -31,13 +31,44 @@ static const struct drm_connector_funcs vkms_connector_funcs = { > .atomic_destroy_state = drm_atomic_helper_connector_destroy_state, > }; > > +static int vkms_connector_read_block(void *context, u8 *buf, unsigned int block, size_t len) > +{ > + struct vkms_config_connector *config = context; > + > + if (block * len + len > config->edid_blob_len) The parameters to the read block function are a bit weird for historical reasons. The start offset is indicated by block number, length by len. The start byte offset is thus block * EDID_LENGTH! There's no smaller granularity for start offset. However len can be < EDID_LENGTH! So the above should be (block * EDID_LENGTH + len > edid_blob_len) > + return 1; > + memcpy(buf, &config->edid_blob[block * len], len); And this should be &config->edid_blob[block * EDID_LENGTH]. (Your patch would work, but just by coincidence due to the way the read block function is currently called.) > + return 0; > +} > + > static int vkms_conn_get_modes(struct drm_connector *connector) > { > + const struct drm_edid *drm_edid = NULL; > int count; > + struct vkms_config_connector *connector_cfg; > + struct vkms_device *vkmsdev = drm_device_to_vkms_device(connector->dev); > + struct vkms_config_connector *context = NULL; > + > + list_for_each_entry(connector_cfg, &vkmsdev->config->connectors, link) { > + if (connector_cfg->connector == connector) { > + context = connector_cfg; > + break; > + } > + } > + if (context) > + drm_edid = drm_edid_read_custom(connector, vkms_connector_read_block, context); Thanks for using drm_edid_read_custom() for this btw! > + > + /* > + * Unconditionally update the connector. If the EDID was read > + * successfully, fill in the connector information derived from the > + * EDID. Otherwise, if the EDID is NULL, clear the connector > + * information. > + */ > + drm_edid_connector_update(connector, drm_edid); > + > + count = drm_edid_connector_add_modes(connector); > > - /* Use the default modes list from DRM */ > - count = drm_add_modes_noedid(connector, XRES_MAX, YRES_MAX); > - drm_set_preferred_mode(connector, XRES_DEF, YRES_DEF); I don't really know anything about your use case, but don't you want to fall back to the above for drm_edid == NULL? *shrug* BR, Jani. > + drm_edid_free(drm_edid); > > return count; > } -- Jani Nikula, Intel