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Subject[PATCH 5.10 114/563] media: venus: core, venc, vdec: Fix probe dependency error
Date
From: Bryan O'Donoghue <bryan.odonoghue@linaro.org>

[ Upstream commit 08b1cf474b7f72750adebe0f0a35f8e9a3eb75f6 ]

Commit aaaa93eda64b ("media] media: venus: venc: add video encoder files")
is the last in a series of three commits to add core.c vdec.c and venc.c
adding core, encoder and decoder.

The encoder and decoder check for core drvdata as set and return -EPROBE_DEFER
if it has not been set, however both the encoder and decoder rely on
core.v4l2_dev as valid.

core.v4l2_dev will not be valid until v4l2_device_register() has completed
in core.c's probe().

Normally this is never seen however, Dmitry reported the following
backtrace when compiling drivers and firmware directly into a kernel image.

[ 5.259968] Hardware name: Qualcomm Technologies, Inc. Robotics RB5 (DT)
[ 5.269850] sd 0:0:0:3: [sdd] Optimal transfer size 524288 bytes
[ 5.275505] Workqueue: events deferred_probe_work_func
[ 5.275513] pstate: 60400005 (nZCv daif +PAN -UAO -TCO BTYPE=--)
[ 5.441211] usb 2-1: new SuperSpeedPlus Gen 2 USB device number 2 using xhci-hcd
[ 5.442486] pc : refcount_warn_saturate+0x140/0x148
[ 5.493756] hub 2-1:1.0: USB hub found
[ 5.496266] lr : refcount_warn_saturate+0x140/0x148
[ 5.500982] hub 2-1:1.0: 4 ports detected
[ 5.503440] sp : ffff80001067b730
[ 5.503442] x29: ffff80001067b730
[ 5.592660] usb 1-1: new high-speed USB device number 2 using xhci-hcd
[ 5.598478] x28: ffff6c6bc1c379b8
[ 5.598480] x27: ffffa5c673852960 x26: ffffa5c673852000
[ 5.598484] x25: ffff6c6bc1c37800 x24: 0000000000000001
[ 5.810652] x23: 0000000000000000 x22: ffffa5c673bc7118
[ 5.813777] hub 1-1:1.0: USB hub found
[ 5.816108] x21: ffffa5c674440000 x20: 0000000000000001
[ 5.820846] hub 1-1:1.0: 4 ports detected
[ 5.825415] x19: ffffa5c6744f4000 x18: ffffffffffffffff
[ 5.825418] x17: 0000000000000000 x16: 0000000000000000
[ 5.825421] x15: 00000a4810c193ba x14: 0000000000000000
[ 5.825424] x13: 00000000000002b8 x12: 000000000000f20a
[ 5.825427] x11: 000000000000f20a x10: 0000000000000038
[ 5.845447] usb 2-1.1: new SuperSpeed Gen 1 USB device number 3 using xhci-hcd
[ 5.845904]
[ 5.845905] x9 : 0000000000000000 x8 : ffff6c6d36fae780
[ 5.871208] x7 : ffff6c6d36faf240 x6 : 0000000000000000
[ 5.876664] x5 : 0000000000000004 x4 : 0000000000000085
[ 5.882121] x3 : 0000000000000119 x2 : ffffa5c6741ef478
[ 5.887578] x1 : 3acbb3926faf5f00 x0 : 0000000000000000
[ 5.893036] Call trace:
[ 5.895551] refcount_warn_saturate+0x140/0x148
[ 5.900202] __video_register_device+0x64c/0xd10
[ 5.904944] venc_probe+0xc4/0x148
[ 5.908444] platform_probe+0x68/0xe0
[ 5.912210] really_probe+0x118/0x3e0
[ 5.915977] driver_probe_device+0x5c/0xc0
[ 5.920187] __device_attach_driver+0x98/0xb8
[ 5.924661] bus_for_each_drv+0x68/0xd0
[ 5.928604] __device_attach+0xec/0x148
[ 5.932547] device_initial_probe+0x14/0x20
[ 5.936845] bus_probe_device+0x9c/0xa8
[ 5.940788] device_add+0x3e8/0x7c8
[ 5.944376] of_device_add+0x4c/0x60
[ 5.948056] of_platform_device_create_pdata+0xbc/0x140
[ 5.953425] of_platform_bus_create+0x17c/0x3c0
[ 5.958078] of_platform_populate+0x80/0x110
[ 5.962463] venus_probe+0x2ec/0x4d8
[ 5.966143] platform_probe+0x68/0xe0
[ 5.969907] really_probe+0x118/0x3e0
[ 5.973674] driver_probe_device+0x5c/0xc0
[ 5.977882] __device_attach_driver+0x98/0xb8
[ 5.982356] bus_for_each_drv+0x68/0xd0
[ 5.986298] __device_attach+0xec/0x148
[ 5.990242] device_initial_probe+0x14/0x20
[ 5.994539] bus_probe_device+0x9c/0xa8
[ 5.998481] deferred_probe_work_func+0x74/0xb0
[ 6.003132] process_one_work+0x1e8/0x360
[ 6.007254] worker_thread+0x208/0x478
[ 6.011106] kthread+0x150/0x158
[ 6.014431] ret_from_fork+0x10/0x30
[ 6.018111] ---[ end trace f074246b1ecdb466 ]---

This patch fixes by

- Only setting drvdata after v4l2_device_register() completes
- Moving v4l2_device_register() so that suspend/reume in core::probe()
stays as-is
- Changes pm_ops->core_function() to take struct venus_core not struct
device
- Minimal rework of v4l2_device_*register in probe/remove

Reported-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Signed-off-by: Bryan O'Donoghue <bryan.odonoghue@linaro.org>
Signed-off-by: Stanimir Varbanov <stanimir.varbanov@linaro.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/media/platform/qcom/venus/core.c | 30 +++++++++++--------
.../media/platform/qcom/venus/pm_helpers.c | 30 ++++++++-----------
.../media/platform/qcom/venus/pm_helpers.h | 7 +++--
3 files changed, 34 insertions(+), 33 deletions(-)

diff --git a/drivers/media/platform/qcom/venus/core.c b/drivers/media/platform/qcom/venus/core.c
index 58ddebbb84468..bad553bf9f304 100644
--- a/drivers/media/platform/qcom/venus/core.c
+++ b/drivers/media/platform/qcom/venus/core.c
@@ -222,7 +222,6 @@ static int venus_probe(struct platform_device *pdev)
return -ENOMEM;

core->dev = dev;
- platform_set_drvdata(pdev, core);

r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
core->base = devm_ioremap_resource(dev, r);
@@ -252,7 +251,7 @@ static int venus_probe(struct platform_device *pdev)
return -ENODEV;

if (core->pm_ops->core_get) {
- ret = core->pm_ops->core_get(dev);
+ ret = core->pm_ops->core_get(core);
if (ret)
return ret;
}
@@ -277,6 +276,12 @@ static int venus_probe(struct platform_device *pdev)
if (ret)
goto err_core_put;

+ ret = v4l2_device_register(dev, &core->v4l2_dev);
+ if (ret)
+ goto err_core_deinit;
+
+ platform_set_drvdata(pdev, core);
+
pm_runtime_enable(dev);

ret = pm_runtime_get_sync(dev);
@@ -311,10 +316,6 @@ static int venus_probe(struct platform_device *pdev)
if (ret)
goto err_venus_shutdown;

- ret = v4l2_device_register(dev, &core->v4l2_dev);
- if (ret)
- goto err_core_deinit;
-
ret = pm_runtime_put_sync(dev);
if (ret) {
pm_runtime_get_noresume(dev);
@@ -327,8 +328,6 @@ static int venus_probe(struct platform_device *pdev)

err_dev_unregister:
v4l2_device_unregister(&core->v4l2_dev);
-err_core_deinit:
- hfi_core_deinit(core, false);
err_venus_shutdown:
venus_shutdown(core);
err_runtime_disable:
@@ -336,9 +335,11 @@ err_runtime_disable:
pm_runtime_set_suspended(dev);
pm_runtime_disable(dev);
hfi_destroy(core);
+err_core_deinit:
+ hfi_core_deinit(core, false);
err_core_put:
if (core->pm_ops->core_put)
- core->pm_ops->core_put(dev);
+ core->pm_ops->core_put(core);
return ret;
}

@@ -364,11 +365,14 @@ static int venus_remove(struct platform_device *pdev)
pm_runtime_disable(dev);

if (pm_ops->core_put)
- pm_ops->core_put(dev);
+ pm_ops->core_put(core);
+
+ v4l2_device_unregister(&core->v4l2_dev);

hfi_destroy(core);

v4l2_device_unregister(&core->v4l2_dev);
+
mutex_destroy(&core->pm_lock);
mutex_destroy(&core->lock);
venus_dbgfs_deinit(core);
@@ -387,7 +391,7 @@ static __maybe_unused int venus_runtime_suspend(struct device *dev)
return ret;

if (pm_ops->core_power) {
- ret = pm_ops->core_power(dev, POWER_OFF);
+ ret = pm_ops->core_power(core, POWER_OFF);
if (ret)
return ret;
}
@@ -405,7 +409,7 @@ static __maybe_unused int venus_runtime_suspend(struct device *dev)
err_video_path:
icc_set_bw(core->cpucfg_path, kbps_to_icc(1000), 0);
err_cpucfg_path:
- pm_ops->core_power(dev, POWER_ON);
+ pm_ops->core_power(core, POWER_ON);

return ret;
}
@@ -425,7 +429,7 @@ static __maybe_unused int venus_runtime_resume(struct device *dev)
return ret;

if (pm_ops->core_power) {
- ret = pm_ops->core_power(dev, POWER_ON);
+ ret = pm_ops->core_power(core, POWER_ON);
if (ret)
return ret;
}
diff --git a/drivers/media/platform/qcom/venus/pm_helpers.c b/drivers/media/platform/qcom/venus/pm_helpers.c
index bce9a370015fb..63095d70f8d82 100644
--- a/drivers/media/platform/qcom/venus/pm_helpers.c
+++ b/drivers/media/platform/qcom/venus/pm_helpers.c
@@ -276,16 +276,13 @@ set_freq:
return 0;
}

-static int core_get_v1(struct device *dev)
+static int core_get_v1(struct venus_core *core)
{
- struct venus_core *core = dev_get_drvdata(dev);
-
return core_clks_get(core);
}

-static int core_power_v1(struct device *dev, int on)
+static int core_power_v1(struct venus_core *core, int on)
{
- struct venus_core *core = dev_get_drvdata(dev);
int ret = 0;

if (on == POWER_ON)
@@ -752,12 +749,12 @@ static int venc_power_v4(struct device *dev, int on)
return ret;
}

-static int vcodec_domains_get(struct device *dev)
+static int vcodec_domains_get(struct venus_core *core)
{
int ret;
struct opp_table *opp_table;
struct device **opp_virt_dev;
- struct venus_core *core = dev_get_drvdata(dev);
+ struct device *dev = core->dev;
const struct venus_resources *res = core->res;
struct device *pd;
unsigned int i;
@@ -808,9 +805,8 @@ opp_attach_err:
return ret;
}

-static void vcodec_domains_put(struct device *dev)
+static void vcodec_domains_put(struct venus_core *core)
{
- struct venus_core *core = dev_get_drvdata(dev);
const struct venus_resources *res = core->res;
unsigned int i;

@@ -833,9 +829,9 @@ skip_pmdomains:
dev_pm_opp_detach_genpd(core->opp_table);
}

-static int core_get_v4(struct device *dev)
+static int core_get_v4(struct venus_core *core)
{
- struct venus_core *core = dev_get_drvdata(dev);
+ struct device *dev = core->dev;
const struct venus_resources *res = core->res;
int ret;

@@ -874,7 +870,7 @@ static int core_get_v4(struct device *dev)
}
}

- ret = vcodec_domains_get(dev);
+ ret = vcodec_domains_get(core);
if (ret) {
if (core->has_opp_table)
dev_pm_opp_of_remove_table(dev);
@@ -885,14 +881,14 @@ static int core_get_v4(struct device *dev)
return 0;
}

-static void core_put_v4(struct device *dev)
+static void core_put_v4(struct venus_core *core)
{
- struct venus_core *core = dev_get_drvdata(dev);
+ struct device *dev = core->dev;

if (legacy_binding)
return;

- vcodec_domains_put(dev);
+ vcodec_domains_put(core);

if (core->has_opp_table)
dev_pm_opp_of_remove_table(dev);
@@ -901,9 +897,9 @@ static void core_put_v4(struct device *dev)

}

-static int core_power_v4(struct device *dev, int on)
+static int core_power_v4(struct venus_core *core, int on)
{
- struct venus_core *core = dev_get_drvdata(dev);
+ struct device *dev = core->dev;
struct device *pmctrl = core->pmdomains[0];
int ret = 0;

diff --git a/drivers/media/platform/qcom/venus/pm_helpers.h b/drivers/media/platform/qcom/venus/pm_helpers.h
index aa2f6afa23544..a492c50c5543c 100644
--- a/drivers/media/platform/qcom/venus/pm_helpers.h
+++ b/drivers/media/platform/qcom/venus/pm_helpers.h
@@ -4,14 +4,15 @@
#define __VENUS_PM_HELPERS_H__

struct device;
+struct venus_core;

#define POWER_ON 1
#define POWER_OFF 0

struct venus_pm_ops {
- int (*core_get)(struct device *dev);
- void (*core_put)(struct device *dev);
- int (*core_power)(struct device *dev, int on);
+ int (*core_get)(struct venus_core *core);
+ void (*core_put)(struct venus_core *core);
+ int (*core_power)(struct venus_core *core, int on);

int (*vdec_get)(struct device *dev);
void (*vdec_put)(struct device *dev);
--
2.34.1


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