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160 lines
4.5 KiB
Diff
160 lines
4.5 KiB
Diff
From c7660cc977621c4a14d870d523918df067f0db39 Mon Sep 17 00:00:00 2001
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From: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
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Date: Fri, 23 Apr 2021 16:47:42 +0200
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Subject: [PATCH 155/247] media: atmel: properly get pm_runtime
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There are several issues in the way the atmel driver handles
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pm_runtime_get_sync():
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- it doesn't check return codes;
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- it doesn't properly decrement the usage_count on all places;
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- it starts streaming even if pm_runtime_get_sync() fails.
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- while it tries to get pm_runtime at the clock enable logic,
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it doesn't check if the operation was suceeded.
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Replace all occurrences of it to use the new kAPI:
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pm_runtime_resume_and_get(), which ensures that, if the
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return code is not negative, the usage_count was incremented.
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With that, add additional checks when this is called, in order
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to ensure that errors will be properly addressed.
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Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
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---
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drivers/media/platform/atmel/atmel-isc-base.c | 30 ++++++++++++++-----
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drivers/media/platform/atmel/atmel-isi.c | 19 +++++++++---
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2 files changed, 38 insertions(+), 11 deletions(-)
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--- a/drivers/media/platform/atmel/atmel-isc-base.c
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+++ b/drivers/media/platform/atmel/atmel-isc-base.c
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@@ -294,9 +294,13 @@ static int isc_wait_clk_stable(struct cl
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static int isc_clk_prepare(struct clk_hw *hw)
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{
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struct isc_clk *isc_clk = to_isc_clk(hw);
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+ int ret;
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- if (isc_clk->id == ISC_ISPCK)
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- pm_runtime_get_sync(isc_clk->dev);
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+ if (isc_clk->id == ISC_ISPCK) {
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+ ret = pm_runtime_resume_and_get(isc_clk->dev);
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+ if (ret < 0)
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+ return ret;
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+ }
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return isc_wait_clk_stable(hw);
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}
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@@ -353,9 +357,13 @@ static int isc_clk_is_enabled(struct clk
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{
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struct isc_clk *isc_clk = to_isc_clk(hw);
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u32 status;
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+ int ret;
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- if (isc_clk->id == ISC_ISPCK)
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- pm_runtime_get_sync(isc_clk->dev);
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+ if (isc_clk->id == ISC_ISPCK) {
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+ ret = pm_runtime_resume_and_get(isc_clk->dev);
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+ if (ret < 0)
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+ return 0;
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+ }
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regmap_read(isc_clk->regmap, ISC_CLKSR, &status);
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@@ -807,7 +815,12 @@ static int isc_start_streaming(struct vb
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goto err_start_stream;
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}
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- pm_runtime_get_sync(isc->dev);
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+ ret = pm_runtime_resume_and_get(isc->dev);
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+ if (ret < 0) {
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+ v4l2_err(&isc->v4l2_dev, "RPM resume failed in subdev %d\n",
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+ ret);
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+ goto err_pm_get;
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+ }
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ret = isc_configure(isc);
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if (unlikely(ret))
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@@ -838,7 +851,7 @@ static int isc_start_streaming(struct vb
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err_configure:
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pm_runtime_put_sync(isc->dev);
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-
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+err_pm_get:
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v4l2_subdev_call(isc->current_subdev->sd, video, s_stream, 0);
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err_start_stream:
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@@ -1809,6 +1822,7 @@ static void isc_awb_work(struct work_str
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u32 baysel;
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unsigned long flags;
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u32 min, max;
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+ int ret;
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/* streaming is not active anymore */
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if (isc->stop)
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@@ -1831,7 +1845,9 @@ static void isc_awb_work(struct work_str
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ctrls->hist_id = hist_id;
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baysel = isc->config.sd_format->cfa_baycfg << ISC_HIS_CFG_BAYSEL_SHIFT;
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- pm_runtime_get_sync(isc->dev);
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+ ret = pm_runtime_resume_and_get(isc->dev);
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+ if (ret < 0)
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+ return;
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/*
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* only update if we have all the required histograms and controls
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--- a/drivers/media/platform/atmel/atmel-isi.c
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+++ b/drivers/media/platform/atmel/atmel-isi.c
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@@ -423,7 +423,9 @@ static int start_streaming(struct vb2_qu
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struct frame_buffer *buf, *node;
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int ret;
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- pm_runtime_get_sync(isi->dev);
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+ ret = pm_runtime_resume_and_get(isi->dev);
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+ if (ret < 0)
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+ return ret;
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/* Enable stream on the sub device */
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ret = v4l2_subdev_call(isi->entity.subdev, video, s_stream, 1);
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@@ -783,9 +785,10 @@ static int isi_enum_frameintervals(struc
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return 0;
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}
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-static void isi_camera_set_bus_param(struct atmel_isi *isi)
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+static int isi_camera_set_bus_param(struct atmel_isi *isi)
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{
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u32 cfg1 = 0;
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+ int ret;
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/* set bus param for ISI */
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if (isi->pdata.hsync_act_low)
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@@ -802,12 +805,16 @@ static void isi_camera_set_bus_param(str
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cfg1 |= ISI_CFG1_THMASK_BEATS_16;
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/* Enable PM and peripheral clock before operate isi registers */
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- pm_runtime_get_sync(isi->dev);
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+ ret = pm_runtime_resume_and_get(isi->dev);
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+ if (ret < 0)
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+ return ret;
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isi_writel(isi, ISI_CTRL, ISI_CTRL_DIS);
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isi_writel(isi, ISI_CFG1, cfg1);
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pm_runtime_put(isi->dev);
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+
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+ return 0;
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}
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/* -----------------------------------------------------------------------*/
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@@ -1086,7 +1093,11 @@ static int isi_graph_notify_complete(str
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dev_err(isi->dev, "No supported mediabus format found\n");
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return ret;
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}
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- isi_camera_set_bus_param(isi);
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+ ret = isi_camera_set_bus_param(isi);
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+ if (ret) {
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+ dev_err(isi->dev, "Can't wake up device\n");
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+ return ret;
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+ }
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ret = isi_set_default_fmt(isi);
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if (ret) {
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