From patchwork Thu Dec 10 01:21:43 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Lyude Paul X-Patchwork-Id: 11963031 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=-13.5 required=3.0 tests=BAYES_00,DKIM_INVALID, DKIM_SIGNED,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED 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 B1D81C1B0E3 for ; Thu, 10 Dec 2020 01:22:28 +0000 (UTC) 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 mail.kernel.org (Postfix) with ESMTPS id 7DF1223B1F for ; Thu, 10 Dec 2020 01:22:28 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 7DF1223B1F Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=redhat.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=dri-devel-bounces@lists.freedesktop.org Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id B275E6E4F3; Thu, 10 Dec 2020 01:22:26 +0000 (UTC) Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [216.205.24.124]) by gabe.freedesktop.org (Postfix) with ESMTPS id 3CB626E4F3 for ; Thu, 10 Dec 2020 01:22:25 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1607563344; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=dVSsMl3Gx6sx/IqQ4DCXh5N4GHEOpfaK40vOasDL6Vw=; b=KIGuH1lW4SWOeUC6+rZI+nrFhkmvnUBDFAjNrYFIb/RKhw/nis4QiJnkjldh/Tzzr0TP0J CJ1RQYUyYBD30Whi5oFqwOc9dZC3zjozplBNDLvV1QdnZyxgon2MnaKvD/zY9onh7bDMzB PPO6PSzGtpRB6sOm6dypg66dYyDC2eI= Received: from mimecast-mx01.redhat.com (mimecast-mx01.redhat.com [209.132.183.4]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-537-lppnNiRyNR-TZ2eamkpNaQ-1; Wed, 09 Dec 2020 20:22:20 -0500 X-MC-Unique: lppnNiRyNR-TZ2eamkpNaQ-1 Received: from smtp.corp.redhat.com (int-mx07.intmail.prod.int.phx2.redhat.com [10.5.11.22]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id E29E1180A086; Thu, 10 Dec 2020 01:22:17 +0000 (UTC) Received: from Whitewolf.redhat.com (ovpn-113-246.rdu2.redhat.com [10.10.113.246]) by smtp.corp.redhat.com (Postfix) with ESMTP id 380891007625; Thu, 10 Dec 2020 01:22:16 +0000 (UTC) From: Lyude Paul To: dri-devel@lists.freedesktop.org, nouveau@lists.freedesktop.org, intel-gfx@lists.freedesktop.org Subject: [RFC 5/5] drm/nouveau/kms/nv50-: Add basic DPCD backlight support for nouveau Date: Wed, 9 Dec 2020 20:21:43 -0500 Message-Id: <20201210012143.729402-6-lyude@redhat.com> In-Reply-To: <20201210012143.729402-1-lyude@redhat.com> References: <20201210012143.729402-1-lyude@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.84 on 10.5.11.22 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: , Cc: Jani Nikula , Pankaj Bharadiya , David Airlie , open list , greg.depoire@gmail.com, Ben Skeggs , Alex Deucher , Dave Airlie , James Jones Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" This adds support for controlling panel backlights over eDP using VESA's standard backlight control interface. Luckily, Nvidia was cool enough to never come up with their own proprietary backlight control interface (at least, not any that I or the laptop manufacturers I've talked to are aware of), so this should work for any laptop panels which support the VESA backlight control interface. Note that we don't yet provide the panel backlight frequency to the DRM DP backlight helpers. This should be fine for the time being, since it's not required to get basic backlight controls working. For reference: there's some mentions of PWM backlight values in nouveau_reg.h, but I'm not sure these are the values we would want to use. If we figure out how to get this information in the future, we'll have the benefit of more granular backlight control. Signed-off-by: Lyude Paul Cc: Jani Nikula Cc: Dave Airlie Cc: greg.depoire@gmail.com --- drivers/gpu/drm/nouveau/dispnv50/disp.c | 30 +++- drivers/gpu/drm/nouveau/nouveau_backlight.c | 166 ++++++++++++++++++-- drivers/gpu/drm/nouveau/nouveau_connector.h | 9 +- drivers/gpu/drm/nouveau/nouveau_encoder.h | 1 + 4 files changed, 187 insertions(+), 19 deletions(-) diff --git a/drivers/gpu/drm/nouveau/dispnv50/disp.c b/drivers/gpu/drm/nouveau/dispnv50/disp.c index 33fff388dd83..fbc1665afc68 100644 --- a/drivers/gpu/drm/nouveau/dispnv50/disp.c +++ b/drivers/gpu/drm/nouveau/dispnv50/disp.c @@ -31,6 +31,7 @@ #include #include #include +#include #include #include @@ -1615,23 +1616,38 @@ nv50_sor_update(struct nouveau_encoder *nv_encoder, u8 head, core->func->sor->ctrl(core, nv_encoder->or, nv_encoder->ctrl, asyh); } +/* TODO: Should we extend this to PWM-only backlights? + * As well, should we add a DRM helper for waiting for the backlight to acknowledge + * the panel backlight has been shut off? Intel doesn't seem to do this, and uses a + * fixed time delay from the vbios… + */ static void nv50_sor_disable(struct drm_encoder *encoder, struct drm_atomic_state *state) { struct nouveau_encoder *nv_encoder = nouveau_encoder(encoder); + struct nouveau_drm *drm = nouveau_drm(nv_encoder->base.base.dev); struct nouveau_crtc *nv_crtc = nouveau_crtc(nv_encoder->crtc); struct nouveau_connector *nv_connector = nv50_outp_get_old_connector(nv_encoder, state); + int ret; nv_encoder->crtc = NULL; if (nv_crtc) { struct drm_dp_aux *aux = &nv_connector->aux; + struct nouveau_backlight *backlight = nv_connector->backlight; u8 pwr; + if (backlight && backlight->uses_dpcd) { + ret = drm_edp_backlight_disable(aux, &backlight->edp_info); + if (ret < 0) + NV_ERROR(drm, "Failed to disable backlight on [CONNECTOR:%d:%s]: %d\n", + nv_connector->base.base.id, nv_connector->base.name, ret); + } + if (nv_encoder->dcb->type == DCB_OUTPUT_DP) { - int ret = drm_dp_dpcd_readb(aux, DP_SET_POWER, &pwr); + ret = drm_dp_dpcd_readb(aux, DP_SET_POWER, &pwr); if (ret == 0) { pwr &= ~DP_SET_POWER_MASK; @@ -1667,6 +1683,9 @@ nv50_sor_enable(struct drm_encoder *encoder, struct drm_atomic_state *state) struct drm_device *dev = encoder->dev; struct nouveau_drm *drm = nouveau_drm(dev); struct nouveau_connector *nv_connector; +#ifdef CONFIG_DRM_NOUVEAU_BACKLIGHT + struct nouveau_backlight *backlight; +#endif struct nvbios *bios = &drm->vbios; bool hda = false; u8 proto = NV507D_SOR_SET_CONTROL_PROTOCOL_CUSTOM; @@ -1741,6 +1760,14 @@ nv50_sor_enable(struct drm_encoder *encoder, struct drm_atomic_state *state) proto = NV887D_SOR_SET_CONTROL_PROTOCOL_DP_B; nv50_audio_enable(encoder, state, mode); + +#ifdef CONFIG_DRM_NOUVEAU_BACKLIGHT + backlight = nv_connector->backlight; + if (backlight && backlight->uses_dpcd) + drm_edp_backlight_enable(&nv_connector->aux, &backlight->edp_info, + (u16)backlight->dev->props.brightness); +#endif + break; default: BUG(); @@ -2263,6 +2290,7 @@ nv50_disp_atomic_commit_tail(struct drm_atomic_state *state) nv50_crc_atomic_start_reporting(state); if (!flushed) nv50_crc_atomic_release_notifier_contexts(state); + drm_atomic_helper_commit_hw_done(state); drm_atomic_helper_cleanup_planes(dev, state); drm_atomic_helper_commit_cleanup_done(state); diff --git a/drivers/gpu/drm/nouveau/nouveau_backlight.c b/drivers/gpu/drm/nouveau/nouveau_backlight.c index 4acc5be5e9aa..be1669e609f0 100644 --- a/drivers/gpu/drm/nouveau/nouveau_backlight.c +++ b/drivers/gpu/drm/nouveau/nouveau_backlight.c @@ -42,11 +42,6 @@ static struct ida bl_ida; #define BL_NAME_SIZE 15 // 12 for name + 2 for digits + 1 for '\0' -struct nouveau_backlight { - struct backlight_device *dev; - int id; -}; - static bool nouveau_get_backlight_name(char backlight_name[BL_NAME_SIZE], struct nouveau_backlight *bl) @@ -147,6 +142,98 @@ static const struct backlight_ops nv50_bl_ops = { .update_status = nv50_set_intensity, }; +/* + * eDP brightness callbacks need to happen under lock, since we need to + * enable/disable the backlight ourselves for modesets + */ +static int +nv50_edp_get_brightness(struct backlight_device *bd) +{ + struct drm_connector *connector = dev_get_drvdata(bd->dev.parent); + struct drm_device *dev = connector->dev; + struct drm_crtc *crtc; + struct drm_modeset_acquire_ctx ctx; + int ret = 0; + + drm_modeset_acquire_init(&ctx, 0); + +retry: + ret = drm_modeset_lock(&dev->mode_config.connection_mutex, &ctx); + if (ret == -EDEADLK) + goto deadlock; + else if (ret < 0) + goto out; + + crtc = connector->state->crtc; + if (!crtc) + goto out; + + ret = drm_modeset_lock(&crtc->mutex, &ctx); + if (ret == -EDEADLK) + goto deadlock; + else if (ret < 0) + goto out; + + if (!crtc->state->active) + goto out; + + ret = bd->props.brightness; +out: + drm_modeset_drop_locks(&ctx); + drm_modeset_acquire_fini(&ctx); + return ret; +deadlock: + drm_modeset_backoff(&ctx); + goto retry; +} + +static int +nv50_edp_set_brightness(struct backlight_device *bd) +{ + struct drm_connector *connector = dev_get_drvdata(bd->dev.parent); + struct nouveau_connector *nv_connector = nouveau_connector(connector); + struct drm_device *dev = connector->dev; + struct drm_crtc *crtc; + struct drm_dp_aux *aux = &nv_connector->aux; + struct nouveau_backlight *nv_bl = nv_connector->backlight; + struct drm_modeset_acquire_ctx ctx; + int ret = 0; + + drm_modeset_acquire_init(&ctx, 0); +retry: + ret = drm_modeset_lock(&dev->mode_config.connection_mutex, &ctx); + if (ret == -EDEADLK) + goto deadlock; + else if (ret < 0) + goto out; + + crtc = connector->state->crtc; + if (!crtc) + goto out; + + ret = drm_modeset_lock(&crtc->mutex, &ctx); + if (ret == -EDEADLK) + goto deadlock; + else if (ret < 0) + goto out; + + if (crtc->state->active) + ret = drm_edp_backlight_set_level(aux, &nv_bl->edp_info, bd->props.brightness); + +out: + drm_modeset_drop_locks(&ctx); + drm_modeset_acquire_fini(&ctx); + return ret; +deadlock: + drm_modeset_backoff(&ctx); + goto retry; +} + +static const struct backlight_ops nv50_edp_bl_ops = { + .get_brightness = nv50_edp_get_brightness, + .update_status = nv50_edp_set_brightness, +}; + static int nva3_get_intensity(struct backlight_device *bd) { @@ -193,8 +280,13 @@ static const struct backlight_ops nva3_bl_ops = { .update_status = nva3_set_intensity, }; +/* FIXME: perform backlight probing for eDP _before_ this, this only gets called after connector + * registration which happens after the initial modeset + */ static int -nv50_backlight_init(struct nouveau_encoder *nv_encoder, +nv50_backlight_init(struct nouveau_backlight *bl, + struct nouveau_connector *nv_conn, + struct nouveau_encoder *nv_encoder, struct backlight_properties *props, const struct backlight_ops **ops) { @@ -204,6 +296,41 @@ nv50_backlight_init(struct nouveau_encoder *nv_encoder, if (!nvif_rd32(device, NV50_PDISP_SOR_PWM_CTL(ffs(nv_encoder->dcb->or) - 1))) return -ENODEV; + if (nv_conn->type == DCB_CONNECTOR_eDP) { + int ret; + u16 current_level; + u8 edp_dpcd[EDP_DISPLAY_CTL_CAP_SIZE]; + u8 current_mode; + + ret = drm_dp_dpcd_read(&nv_conn->aux, DP_EDP_DPCD_REV, edp_dpcd, + EDP_DISPLAY_CTL_CAP_SIZE); + if (ret < 0) + return ret; + + if (drm_edp_backlight_supported(edp_dpcd)) { + NV_DEBUG(drm, "DPCD backlight controls supported on %s\n", + nv_conn->base.name); + + ret = drm_edp_backlight_init(&nv_conn->aux, &bl->edp_info, 0, edp_dpcd, + ¤t_level, ¤t_mode); + if (ret < 0) + return ret; + + ret = drm_edp_backlight_enable(&nv_conn->aux, &bl->edp_info, current_level); + if (ret < 0) { + NV_ERROR(drm, "Failed to enable backlight on %s: %d\n", + nv_conn->base.name, ret); + return ret; + } + + *ops = &nv50_edp_bl_ops; + props->brightness = current_level; + props->max_brightness = bl->edp_info.max; + bl->uses_dpcd = true; + return 0; + } + } + if (drm->client.device.info.chipset <= 0xa0 || drm->client.device.info.chipset == 0xaa || drm->client.device.info.chipset == 0xac) @@ -243,6 +370,10 @@ nouveau_backlight_init(struct drm_connector *connector) if (!nv_encoder) return 0; + bl = kzalloc(sizeof(*bl), GFP_KERNEL); + if (!bl) + return -ENOMEM; + switch (device->info.family) { case NV_DEVICE_INFO_V0_CURIE: ret = nv40_backlight_init(nv_encoder, &props, &ops); @@ -254,20 +385,19 @@ nouveau_backlight_init(struct drm_connector *connector) case NV_DEVICE_INFO_V0_PASCAL: case NV_DEVICE_INFO_V0_VOLTA: case NV_DEVICE_INFO_V0_TURING: - ret = nv50_backlight_init(nv_encoder, &props, &ops); + ret = nv50_backlight_init(bl, nouveau_connector(connector), + nv_encoder, &props, &ops); break; default: - return 0; + ret = 0; + goto fail_alloc; } - if (ret == -ENODEV) - return 0; - else if (ret) - return ret; - - bl = kzalloc(sizeof(*bl), GFP_KERNEL); - if (!bl) - return -ENOMEM; + if (ret) { + if (ret == -ENODEV) + ret = 0; + goto fail_alloc; + } if (!nouveau_get_backlight_name(backlight_name, bl)) { NV_ERROR(drm, "Failed to retrieve a unique name for the backlight interface\n"); @@ -284,7 +414,9 @@ nouveau_backlight_init(struct drm_connector *connector) } nouveau_connector(connector)->backlight = bl; - bl->dev->props.brightness = bl->dev->ops->get_brightness(bl->dev); + if (!bl->dev->props.brightness) + bl->dev->props.brightness = + bl->dev->ops->get_brightness(bl->dev); backlight_update_status(bl->dev); return 0; diff --git a/drivers/gpu/drm/nouveau/nouveau_connector.h b/drivers/gpu/drm/nouveau/nouveau_connector.h index d0b859c4a80e..40f90e353540 100644 --- a/drivers/gpu/drm/nouveau/nouveau_connector.h +++ b/drivers/gpu/drm/nouveau/nouveau_connector.h @@ -46,7 +46,14 @@ struct nvkm_i2c_port; struct dcb_output; #ifdef CONFIG_DRM_NOUVEAU_BACKLIGHT -struct nouveau_backlight; +struct nouveau_backlight { + struct backlight_device *dev; + + struct drm_edp_backlight_info edp_info; + bool uses_dpcd : 1; + + int id; +}; #endif #define nouveau_conn_atom(p) \ diff --git a/drivers/gpu/drm/nouveau/nouveau_encoder.h b/drivers/gpu/drm/nouveau/nouveau_encoder.h index 21937f1c7dd9..8be4b014b471 100644 --- a/drivers/gpu/drm/nouveau/nouveau_encoder.h +++ b/drivers/gpu/drm/nouveau/nouveau_encoder.h @@ -30,6 +30,7 @@ #include #include +#include #include #include "dispnv04/disp.h" struct nv50_head_atom;