linux-kernel - [PATCH v2 08/43] drm/rockchip: Remove analogix psr worker

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <20180126131710.7622-9-thierry.escande@collabora.com>
Date:   Fri, 26 Jan 2018 14:16:35 +0100
From:   Thierry Escande <thierry.escande@...labora.com>
To:     Archit Taneja <architt@...eaurora.org>,
        Inki Dae <inki.dae@...sung.com>,
        Thierry Reding <thierry.reding@...il.com>,
        Sandy Huang <hjc@...k-chips.com>,
        Sean Paul <seanpaul@...omium.org>,
        David Airlie <airlied@...ux.ie>,
        Tomasz Figa <tfiga@...omium.org>
Cc:     Haixia Shi <hshi@...omium.org>,
        Ørjan Eide <orjan.eide@....com>,
        Zain Wang <wzz@...k-chips.com>,
        Yakir Yang <ykk@...k-chips.com>, Lin Huang <hl@...k-chips.com>,
        Douglas Anderson <dianders@...omium.org>,
        Mark Yao <mark.yao@...k-chips.com>,
        linux-kernel@...r.kernel.org, linux-rockchip@...ts.infradead.org,
        dri-devel@...ts.freedesktop.org
Subject: [PATCH v2 08/43] drm/rockchip: Remove analogix psr worker

From: Sean Paul <seanpaul@...omium.org>

Now that the spinlocks and timers are gone, we can remove the psr
worker located in rockchip's analogix driver and do the enable/disable
directly. This should simplify the code and remove races on disable.

Cc: 征增 王 <wzz@...k-chips.com>
Cc: Stéphane Marchesin <marcheu@...omium.org>
Signed-off-by: Sean Paul <seanpaul@...omium.org>
Signed-off-by: Thierry Escande <thierry.escande@...labora.com>
---
 drivers/gpu/drm/rockchip/analogix_dp-rockchip.c | 31 ++-----------------------
 1 file changed, 2 insertions(+), 29 deletions(-)

diff --git a/drivers/gpu/drm/rockchip/analogix_dp-rockchip.c b/drivers/gpu/drm/rockchip/analogix_dp-rockchip.c
index 7d76ff47028d..36334839a3f8 100644
--- a/drivers/gpu/drm/rockchip/analogix_dp-rockchip.c
+++ b/drivers/gpu/drm/rockchip/analogix_dp-rockchip.c
@@ -71,10 +71,6 @@ struct rockchip_dp_device {
 	struct regmap            *grf;
 	struct reset_control     *rst;
 
-	struct work_struct	 psr_work;
-	struct mutex             psr_lock;
-	unsigned int             psr_state;
-
 	const struct rockchip_dp_chip_data *data;
 
 	struct analogix_dp_device *adp;
@@ -84,28 +80,13 @@ struct rockchip_dp_device {
 static void analogix_dp_psr_set(struct drm_encoder *encoder, bool enabled)
 {
 	struct rockchip_dp_device *dp = to_dp(encoder);
+	int ret;
 
 	if (!analogix_dp_psr_supported(dp->adp))
 		return;
 
 	DRM_DEV_DEBUG(dp->dev, "%s PSR...\n", enabled ? "Entry" : "Exit");
 
-	mutex_lock(&dp->psr_lock);
-	if (enabled)
-		dp->psr_state = EDP_VSC_PSR_STATE_ACTIVE;
-	else
-		dp->psr_state = ~EDP_VSC_PSR_STATE_ACTIVE;
-
-	schedule_work(&dp->psr_work);
-	mutex_unlock(&dp->psr_lock);
-}
-
-static void analogix_dp_psr_work(struct work_struct *work)
-{
-	struct rockchip_dp_device *dp =
-				container_of(work, typeof(*dp), psr_work);
-	int ret;
-
 	ret = rockchip_drm_wait_vact_end(dp->encoder.crtc,
 					 PSR_WAIT_LINE_FLAG_TIMEOUT_MS);
 	if (ret) {
@@ -113,12 +94,10 @@ static void analogix_dp_psr_work(struct work_struct *work)
 		return;
 	}
 
-	mutex_lock(&dp->psr_lock);
-	if (dp->psr_state == EDP_VSC_PSR_STATE_ACTIVE)
+	if (enabled)
 		analogix_dp_enable_psr(dp->adp);
 	else
 		analogix_dp_disable_psr(dp->adp);
-	mutex_unlock(&dp->psr_lock);
 }
 
 static int rockchip_dp_pre_init(struct rockchip_dp_device *dp)
@@ -135,8 +114,6 @@ static int rockchip_dp_poweron(struct analogix_dp_plat_data *plat_data)
 	struct rockchip_dp_device *dp = to_dp(plat_data);
 	int ret;
 
-	cancel_work_sync(&dp->psr_work);
-
 	ret = clk_prepare_enable(dp->pclk);
 	if (ret < 0) {
 		DRM_DEV_ERROR(dp->dev, "failed to enable pclk %d\n", ret);
@@ -355,10 +332,6 @@ static int rockchip_dp_bind(struct device *dev, struct device *master,
 	dp->plat_data.power_off = rockchip_dp_powerdown;
 	dp->plat_data.get_modes = rockchip_dp_get_modes;
 
-	mutex_init(&dp->psr_lock);
-	dp->psr_state = ~EDP_VSC_PSR_STATE_ACTIVE;
-	INIT_WORK(&dp->psr_work, analogix_dp_psr_work);
-
 	ret = rockchip_drm_psr_register(&dp->encoder, analogix_dp_psr_set);
 	if (ret < 0)
 		goto err_cleanup_encoder;
-- 
2.14.1