From patchwork Wed Aug 24 12:47:25 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Tomi Valkeinen X-Patchwork-Id: 12953486 X-Patchwork-Delegate: kieran@bingham.xyz 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 vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 08E3DC32796 for ; Wed, 24 Aug 2022 12:47:51 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S237289AbiHXMru (ORCPT ); Wed, 24 Aug 2022 08:47:50 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:45776 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S237189AbiHXMro (ORCPT ); Wed, 24 Aug 2022 08:47:44 -0400 Received: from perceval.ideasonboard.com (perceval.ideasonboard.com [213.167.242.64]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 7D22A93535 for ; Wed, 24 Aug 2022 05:47:43 -0700 (PDT) Received: from deskari.lan (91-158-154-79.elisa-laajakaista.fi [91.158.154.79]) by perceval.ideasonboard.com (Postfix) with ESMTPSA id A810AA32; Wed, 24 Aug 2022 14:47:38 +0200 (CEST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=ideasonboard.com; s=mail; t=1661345259; bh=lPN/3nndyjmEC5G3XCzp5pICqx+c+Vo7T5f7JQGV5ms=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=GnQvtpjFoL3pzGWPXWLhtNDc8o+dkpB97fU8rFljm3y1SVr765QLxj1hpou33tt1T rrw1axtK0qQU2v1Esw3KjIIJnmDPGttVB0VLEBRRDPxMHfpuZrj//1mdZOUQ3w2yPh b0/gYvvJW2ymNTzUMXido/UB+SbeYudGyhulLwkI= From: Tomi Valkeinen To: Laurent Pinchart , Kieran Bingham , dri-devel@lists.freedesktop.org, linux-renesas-soc@vger.kernel.org Cc: Tomi Valkeinen Subject: [PATCH v4 4/5] drm: rcar-du: fix DSI enable & disable sequence Date: Wed, 24 Aug 2022 15:47:25 +0300 Message-Id: <20220824124726.187224-5-tomi.valkeinen@ideasonboard.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20220824124726.187224-1-tomi.valkeinen@ideasonboard.com> References: <20220824124726.187224-1-tomi.valkeinen@ideasonboard.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-renesas-soc@vger.kernel.org From: Tomi Valkeinen The rcar crtc depends on the clock provided from the rcar DSI bridge. When the DSI bridge is disabled, the clock is stopped, which causes the crtc disable to timeout. Also, while I have no issue with the enable, the documentation suggests to enable the DSI before the crtc so that the crtc has its clock enabled at enable time. This is also not done by the current driver. To fix this, we need to keep the DSI bridge enabled until the crtc has disabled itself, and enable the DSI bridge before crtc enables itself. Add functions rcar_mipi_dsi_pclk_enable and rcar_mipi_dsi_pclk_disable to the rcar DSI bridge driver which the rcar driver can use to enable/disable the DSI clock when needed. This is similar to what is already done with the rcar LVDS bridge. Signed-off-by: Tomi Valkeinen Reviewed-by: Laurent Pinchart --- drivers/gpu/drm/rcar-du/rcar_du_crtc.c | 26 +++++++++++++++++++ drivers/gpu/drm/rcar-du/rcar_du_drv.h | 2 ++ drivers/gpu/drm/rcar-du/rcar_du_encoder.c | 4 +++ drivers/gpu/drm/rcar-du/rcar_mipi_dsi.c | 25 +++++++++++++----- drivers/gpu/drm/rcar-du/rcar_mipi_dsi.h | 31 +++++++++++++++++++++++ 5 files changed, 82 insertions(+), 6 deletions(-) create mode 100644 drivers/gpu/drm/rcar-du/rcar_mipi_dsi.h diff --git a/drivers/gpu/drm/rcar-du/rcar_du_crtc.c b/drivers/gpu/drm/rcar-du/rcar_du_crtc.c index d38092d85df7..3619e1ddeb62 100644 --- a/drivers/gpu/drm/rcar-du/rcar_du_crtc.c +++ b/drivers/gpu/drm/rcar-du/rcar_du_crtc.c @@ -29,6 +29,7 @@ #include "rcar_du_regs.h" #include "rcar_du_vsp.h" #include "rcar_lvds.h" +#include "rcar_mipi_dsi.h" static u32 rcar_du_crtc_read(struct rcar_du_crtc *rcrtc, u32 reg) { @@ -747,6 +748,18 @@ static void rcar_du_crtc_atomic_enable(struct drm_crtc *crtc, rcar_lvds_pclk_enable(bridge, mode->clock * 1000); } + /* + * Similarly to LVDS, on V3U the dot clock is provided by the DSI + * encoder, and we need to enable the DSI clocks before enabling the CRTC. + */ + if ((rcdu->info->dsi_clk_mask & BIT(rcrtc->index)) && + (rstate->outputs & + (BIT(RCAR_DU_OUTPUT_DSI0) | BIT(RCAR_DU_OUTPUT_DSI1)))) { + struct drm_bridge *bridge = rcdu->dsi[rcrtc->index]; + + rcar_mipi_dsi_pclk_enable(bridge, state); + } + rcar_du_crtc_start(rcrtc); /* @@ -780,6 +793,19 @@ static void rcar_du_crtc_atomic_disable(struct drm_crtc *crtc, rcar_lvds_pclk_disable(bridge); } + if ((rcdu->info->dsi_clk_mask & BIT(rcrtc->index)) && + (rstate->outputs & + (BIT(RCAR_DU_OUTPUT_DSI0) | BIT(RCAR_DU_OUTPUT_DSI1)))) { + struct drm_bridge *bridge = rcdu->dsi[rcrtc->index]; + + /* + * Disable the DSI clock output, see + * rcar_du_crtc_atomic_enable(). + */ + + rcar_mipi_dsi_pclk_disable(bridge); + } + spin_lock_irq(&crtc->dev->event_lock); if (crtc->state->event) { drm_crtc_send_vblank_event(crtc, crtc->state->event); diff --git a/drivers/gpu/drm/rcar-du/rcar_du_drv.h b/drivers/gpu/drm/rcar-du/rcar_du_drv.h index bfad7775d9a1..9367c2f59431 100644 --- a/drivers/gpu/drm/rcar-du/rcar_du_drv.h +++ b/drivers/gpu/drm/rcar-du/rcar_du_drv.h @@ -91,6 +91,7 @@ struct rcar_du_device_info { #define RCAR_DU_MAX_GROUPS DIV_ROUND_UP(RCAR_DU_MAX_CRTCS, 2) #define RCAR_DU_MAX_VSPS 4 #define RCAR_DU_MAX_LVDS 2 +#define RCAR_DU_MAX_DSI 2 struct rcar_du_device { struct device *dev; @@ -107,6 +108,7 @@ struct rcar_du_device { struct platform_device *cmms[RCAR_DU_MAX_CRTCS]; struct rcar_du_vsp vsps[RCAR_DU_MAX_VSPS]; struct drm_bridge *lvds[RCAR_DU_MAX_LVDS]; + struct drm_bridge *dsi[RCAR_DU_MAX_DSI]; struct { struct drm_property *colorkey; diff --git a/drivers/gpu/drm/rcar-du/rcar_du_encoder.c b/drivers/gpu/drm/rcar-du/rcar_du_encoder.c index 60d6be78323b..ac93e08e8af4 100644 --- a/drivers/gpu/drm/rcar-du/rcar_du_encoder.c +++ b/drivers/gpu/drm/rcar-du/rcar_du_encoder.c @@ -84,6 +84,10 @@ int rcar_du_encoder_init(struct rcar_du_device *rcdu, if (output == RCAR_DU_OUTPUT_LVDS0 || output == RCAR_DU_OUTPUT_LVDS1) rcdu->lvds[output - RCAR_DU_OUTPUT_LVDS0] = bridge; + + if (output == RCAR_DU_OUTPUT_DSI0 || + output == RCAR_DU_OUTPUT_DSI1) + rcdu->dsi[output - RCAR_DU_OUTPUT_DSI0] = bridge; } /* diff --git a/drivers/gpu/drm/rcar-du/rcar_mipi_dsi.c b/drivers/gpu/drm/rcar-du/rcar_mipi_dsi.c index 9c79fe2fc70b..06250f2f3499 100644 --- a/drivers/gpu/drm/rcar-du/rcar_mipi_dsi.c +++ b/drivers/gpu/drm/rcar-du/rcar_mipi_dsi.c @@ -598,7 +598,22 @@ static int rcar_mipi_dsi_attach(struct drm_bridge *bridge, static void rcar_mipi_dsi_atomic_enable(struct drm_bridge *bridge, struct drm_bridge_state *old_bridge_state) { - struct drm_atomic_state *state = old_bridge_state->base.state; + struct rcar_mipi_dsi *dsi = bridge_to_rcar_mipi_dsi(bridge); + + rcar_mipi_dsi_start_video(dsi); +} + +static void rcar_mipi_dsi_atomic_disable(struct drm_bridge *bridge, + struct drm_bridge_state *old_bridge_state) +{ + struct rcar_mipi_dsi *dsi = bridge_to_rcar_mipi_dsi(bridge); + + rcar_mipi_dsi_stop_video(dsi); +} + +void rcar_mipi_dsi_pclk_enable(struct drm_bridge *bridge, + struct drm_atomic_state *state) +{ struct rcar_mipi_dsi *dsi = bridge_to_rcar_mipi_dsi(bridge); const struct drm_display_mode *mode; struct drm_connector *connector; @@ -626,8 +641,6 @@ static void rcar_mipi_dsi_atomic_enable(struct drm_bridge *bridge, if (ret < 0) goto err_dsi_start_hs; - rcar_mipi_dsi_start_video(dsi); - return; err_dsi_start_hs: @@ -635,16 +648,16 @@ static void rcar_mipi_dsi_atomic_enable(struct drm_bridge *bridge, err_dsi_startup: rcar_mipi_dsi_clk_disable(dsi); } +EXPORT_SYMBOL_GPL(rcar_mipi_dsi_pclk_enable); -static void rcar_mipi_dsi_atomic_disable(struct drm_bridge *bridge, - struct drm_bridge_state *old_bridge_state) +void rcar_mipi_dsi_pclk_disable(struct drm_bridge *bridge) { struct rcar_mipi_dsi *dsi = bridge_to_rcar_mipi_dsi(bridge); - rcar_mipi_dsi_stop_video(dsi); rcar_mipi_dsi_shutdown(dsi); rcar_mipi_dsi_clk_disable(dsi); } +EXPORT_SYMBOL_GPL(rcar_mipi_dsi_pclk_disable); static enum drm_mode_status rcar_mipi_dsi_bridge_mode_valid(struct drm_bridge *bridge, diff --git a/drivers/gpu/drm/rcar-du/rcar_mipi_dsi.h b/drivers/gpu/drm/rcar-du/rcar_mipi_dsi.h new file mode 100644 index 000000000000..528a196e6edd --- /dev/null +++ b/drivers/gpu/drm/rcar-du/rcar_mipi_dsi.h @@ -0,0 +1,31 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + * R-Car DSI Encoder + * + * Copyright (C) 2022 Renesas Electronics Corporation + * + * Contact: Tomi Valkeinen + */ + +#ifndef __RCAR_MIPI_DSI_H__ +#define __RCAR_MIPI_DSI_H__ + +struct drm_atomic_state; +struct drm_bridge; + +#if IS_ENABLED(CONFIG_DRM_RCAR_MIPI_DSI) +void rcar_mipi_dsi_pclk_enable(struct drm_bridge *bridge, + struct drm_atomic_state *state); +void rcar_mipi_dsi_pclk_disable(struct drm_bridge *bridge); +#else +static inline void rcar_mipi_dsi_pclk_enable(struct drm_bridge *bridge, + struct drm_atomic_state *state) +{ +} + +static inline void rcar_mipi_dsi_pclk_disable(struct drm_bridge *bridge) +{ +} +#endif /* CONFIG_DRM_RCAR_MIPI_DSI */ + +#endif /* __RCAR_MIPI_DSI_H__ */