linux-kernel - [PATCH v3 2/3] drm/bridge: nwl-dsi: Remove a check on unchanged HS clock rate from ->mode

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Message-Id: <1619170003-4817-3-git-send-email-victor.liu@nxp.com>
Date:   Fri, 23 Apr 2021 17:26:42 +0800
From:   Liu Ying <victor.liu@....com>
To:     dri-devel@...ts.freedesktop.org
Cc:     linux-kernel@...r.kernel.org, a.hajda@...sung.com,
        narmstrong@...libre.com, robert.foss@...aro.org,
        Laurent.pinchart@...asonboard.com, jonas@...boo.se,
        jernej.skrabec@...l.net, airlied@...ux.ie, daniel@...ll.ch,
        agx@...xcpu.org, robert.chiras@....com, linux-imx@....com
Subject: [PATCH v3 2/3] drm/bridge: nwl-dsi: Remove a check on unchanged HS clock rate from ->mode_set()

The check on unchanged HS clock rate in ->mode_set() improves
the callback's performance a bit by early return.  However,
the up-coming patch would get MIPI DSI controller and PHY ready
in ->mode_set() after that check, thus likely skipped.
So, this patch removes that check to make sure MIPI DSI controller
and PHY will be brought up and taken down from ->mode_set() and
->atomic_disable() respectively in pairs.

Cc: Andrzej Hajda <a.hajda@...sung.com>
Cc: Neil Armstrong <narmstrong@...libre.com>
Cc: Robert Foss <robert.foss@...aro.org>
Cc: Laurent Pinchart <Laurent.pinchart@...asonboard.com>
Cc: Jonas Karlman <jonas@...boo.se>
Cc: Jernej Skrabec <jernej.skrabec@...l.net>
Cc: David Airlie <airlied@...ux.ie>
Cc: Daniel Vetter <daniel@...ll.ch>
Cc: Guido Günther <agx@...xcpu.org>
Cc: Robert Chiras <robert.chiras@....com>
Cc: NXP Linux Team <linux-imx@....com>
Signed-off-by: Liu Ying <victor.liu@....com>
---
v2->v3:
* Split from the single patch in v2 to clarify changes. (Neil)

 drivers/gpu/drm/bridge/nwl-dsi.c | 7 -------
 1 file changed, 7 deletions(-)

diff --git a/drivers/gpu/drm/bridge/nwl-dsi.c b/drivers/gpu/drm/bridge/nwl-dsi.c
index c65ca860712d2..601ccc4a7cdc7 100644
--- a/drivers/gpu/drm/bridge/nwl-dsi.c
+++ b/drivers/gpu/drm/bridge/nwl-dsi.c
@@ -856,13 +856,6 @@ nwl_dsi_bridge_mode_set(struct drm_bridge *bridge,
 	if (ret < 0)
 		return;
 
-	/*
-	 * If hs clock is unchanged, we're all good - all parameters are
-	 * derived from it atm.
-	 */
-	if (new_cfg.mipi_dphy.hs_clk_rate == dsi->phy_cfg.mipi_dphy.hs_clk_rate)
-		return;
-
 	phy_ref_rate = clk_get_rate(dsi->phy_ref_clk);
 	DRM_DEV_DEBUG_DRIVER(dev, "PHY at ref rate: %lu\n", phy_ref_rate);
 	/* Save the new desired phy config */
-- 
2.25.1