linux-kernel - [PATCH 02/12] drm/exynos: move pm_runtime_get_sync() to exynos_dsi

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: <1527500833-16005-3-git-send-email-m.purski@samsung.com>
Date:   Mon, 28 May 2018 11:47:06 +0200
From:   Maciej Purski <m.purski@...sung.com>
To:     linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-samsung-soc@...r.kernel.org, devicetree@...r.kernel.org,
        dri-devel@...ts.freedesktop.org
Cc:     David Airlie <airlied@...ux.ie>, Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Thierry Reding <thierry.reding@...il.com>,
        Kukjin Kim <kgene@...nel.org>,
        Krzysztof Kozlowski <krzk@...nel.org>,
        Archit Taneja <architt@...eaurora.org>,
        Andrzej Hajda <a.hajda@...sung.com>,
        Laurent Pinchart <Laurent.pinchart@...asonboard.com>,
        Inki Dae <inki.dae@...sung.com>,
        Joonyoung Shim <jy0922.shim@...sung.com>,
        Seung-Woo Kim <sw0312.kim@...sung.com>,
        Kyungmin Park <kyungmin.park@...sung.com>,
        Marek Szyprowski <m.szyprowski@...sung.com>,
        Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>,
        Maciej Purski <m.purski@...sung.com>
Subject: [PATCH 02/12] drm/exynos: move pm_runtime_get_sync() to
 exynos_dsi_init()

In order to allow bridge drivers to use DSI transfers in their
pre_enable callbacks, pm_runtime_get_sync() should be performed before
exynos_dsi_enable(). DSIM_STATE_ENABLED flag now should not guard
from calling dsi_host_transfer() before enabling.

Signed-off-by: Maciej Purski <m.purski@...sung.com>
---
 drivers/gpu/drm/exynos/exynos_drm_dsi.c | 6 +-----
 1 file changed, 1 insertion(+), 5 deletions(-)

diff --git a/drivers/gpu/drm/exynos/exynos_drm_dsi.c b/drivers/gpu/drm/exynos/exynos_drm_dsi.c
index 9599e6b..94460b0 100644
--- a/drivers/gpu/drm/exynos/exynos_drm_dsi.c
+++ b/drivers/gpu/drm/exynos/exynos_drm_dsi.c
@@ -1312,6 +1312,7 @@ static int exynos_dsi_init(struct exynos_dsi *dsi)
 {
 	const struct exynos_dsi_driver_data *driver_data = dsi->driver_data;
 
+	pm_runtime_get_sync(dsi->dev);
 	exynos_dsi_reset(dsi);
 	exynos_dsi_enable_irq(dsi);
 
@@ -1388,7 +1389,6 @@ static void exynos_dsi_enable(struct drm_encoder *encoder)
 	ret = drm_panel_prepare(dsi->panel);
 	if (ret < 0) {
 		dsi->state &= ~DSIM_STATE_ENABLED;
-		pm_runtime_put_sync(dsi->dev);
 		return;
 	}
 
@@ -1400,7 +1400,6 @@ static void exynos_dsi_enable(struct drm_encoder *encoder)
 		dsi->state &= ~DSIM_STATE_ENABLED;
 		exynos_dsi_set_display_enable(dsi, false);
 		drm_panel_unprepare(dsi->panel);
-		pm_runtime_put_sync(dsi->dev);
 		return;
 	}
 
@@ -1566,9 +1565,6 @@ static ssize_t exynos_dsi_host_transfer(struct mipi_dsi_host *host,
 	struct exynos_dsi_transfer xfer;
 	int ret;
 
-	if (!(dsi->state & DSIM_STATE_ENABLED))
-		return -EINVAL;
-
 	if (!(dsi->state & DSIM_STATE_INITIALIZED)) {
 		ret = exynos_dsi_init(dsi);
 		if (ret)
-- 
2.7.4