From: Sasha Levin <sashal@kernel.org>
To: linux-kernel@vger.kernel.org, stable@vger.kernel.org
Cc: Philip Chen <philipchen@chromium.org>,
Douglas Anderson <dianders@chromium.org>,
Stephen Boyd <swboyd@chromium.org>,
Rob Clark <robdclark@chromium.org>,
Sasha Levin <sashal@kernel.org>,
robdclark@gmail.com, sean@poorly.run, airlied@linux.ie,
daniel@ffwll.ch, dmitry.baryshkov@linaro.org,
abhinavk@codeaurora.org, bjorn.andersson@linaro.org,
jonathan@marek.ca, jesszhan@codeaurora.org, vulab@iscas.ac.cn,
tiny.windzz@gmail.com, linux-arm-msm@vger.kernel.org,
dri-devel@lists.freedesktop.org, freedreno@lists.freedesktop.org
Subject: [PATCH AUTOSEL 4.19 1/7] drm/msm/dsi: set default num_data_lanes
Date: Mon, 6 Dec 2021 16:19:21 -0500 [thread overview]
Message-ID: <20211206211934.1661294-1-sashal@kernel.org> (raw)
From: Philip Chen <philipchen@chromium.org>
[ Upstream commit cd92cc187c053ab010a1570e2d61d68394a5c725 ]
If "data_lanes" property of the dsi output endpoint is missing in
the DT, num_data_lanes would be 0 by default, which could cause
dsi_host_attach() to fail if dsi->lanes is set to a non-zero value
by the bridge driver.
According to the binding document of msm dsi controller, the
input/output endpoint of the controller is expected to have 4 lanes.
So let's set num_data_lanes to 4 by default.
Signed-off-by: Philip Chen <philipchen@chromium.org>
Reviewed-by: Douglas Anderson <dianders@chromium.org>
Reviewed-by: Stephen Boyd <swboyd@chromium.org>
Link: https://lore.kernel.org/r/20211030100812.1.I6cd9af36b723fed277d34539d3b2ba4ca233ad2d@changeid
Signed-off-by: Rob Clark <robdclark@chromium.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/gpu/drm/msm/dsi/dsi_host.c | 2 ++
1 file changed, 2 insertions(+)
diff --git a/drivers/gpu/drm/msm/dsi/dsi_host.c b/drivers/gpu/drm/msm/dsi/dsi_host.c
index 77dae147caf90..9abfb19ea7ede 100644
--- a/drivers/gpu/drm/msm/dsi/dsi_host.c
+++ b/drivers/gpu/drm/msm/dsi/dsi_host.c
@@ -1677,6 +1677,8 @@ static int dsi_host_parse_lane_data(struct msm_dsi_host *msm_host,
if (!prop) {
dev_dbg(dev,
"failed to find data lane mapping, using default\n");
+ /* Set the number of date lanes to 4 by default. */
+ msm_host->num_data_lanes = 4;
return 0;
}
--
2.33.0
next reply other threads:[~2021-12-06 21:19 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-12-06 21:19 Sasha Levin [this message]
2021-12-06 21:19 ` [PATCH AUTOSEL 4.19 2/7] USB: NO_LPM quirk Lenovo Powered USB-C Travel Hub Sasha Levin
2021-12-06 21:19 ` [PATCH AUTOSEL 4.19 3/7] net/mlx4_en: Update reported link modes for 1/10G Sasha Levin
2021-12-06 21:19 ` [PATCH AUTOSEL 4.19 4/7] parisc/agp: Annotate parisc agp init functions with __init Sasha Levin
2021-12-06 21:19 ` [PATCH AUTOSEL 4.19 5/7] i2c: rk3x: Handle a spurious start completion interrupt flag Sasha Levin
2021-12-06 21:19 ` [PATCH AUTOSEL 4.19 6/7] net: netlink: af_netlink: Prevent empty skb by adding a check on len Sasha Levin
2021-12-06 21:19 ` [PATCH AUTOSEL 4.19 7/7] tracing: Fix a kmemleak false positive in tracing_map Sasha Levin
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