Re: [PATCH v3 2/4] media: venus: core: Add support for opp tables/perf voting
From: Rajendra Nayak
Date: Thu Jul 23 2020 - 07:37:16 EST
Hey Stan,
On 7/22/2020 1:57 PM, Stanimir Varbanov wrote:
Hi Rajendra,
Thanks for the patch!
Sorry for last minute comments.
Thanks for reviewing the patch, I have addressed all your
review feedback from below and repostd a v4 now [1]
cheers,
Rajendra
[1] https://lore.kernel.org/patchwork/project/lkml/list/?series=454732
On 7/20/20 10:07 AM, Rajendra Nayak wrote:
Add support to add OPP tables and perf voting on the OPP powerdomain.
This is needed so venus votes on the corresponding performance state
for the OPP powerdomain along with setting the core clock rate.
Signed-off-by: Rajendra Nayak <rnayak@xxxxxxxxxxxxxx>
Reviewed-by: Matthias Kaehlcke <mka@xxxxxxxxxxxx>
---
drivers/media/platform/qcom/venus/core.c | 43 +++++++++++++++++---
drivers/media/platform/qcom/venus/core.h | 5 +++
drivers/media/platform/qcom/venus/pm_helpers.c | 54 ++++++++++++++++++++++++--
3 files changed, 92 insertions(+), 10 deletions(-)
diff --git a/drivers/media/platform/qcom/venus/core.c b/drivers/media/platform/qcom/venus/core.c
index 203c653..b9f61a6 100644
--- a/drivers/media/platform/qcom/venus/core.c
+++ b/drivers/media/platform/qcom/venus/core.c
@@ -12,6 +12,7 @@
#include <linux/platform_device.h>
#include <linux/slab.h>
#include <linux/types.h>
+#include <linux/pm_opp.h>
#include <linux/pm_runtime.h>
#include <media/videobuf2-v4l2.h>
#include <media/v4l2-mem2mem.h>
@@ -216,21 +217,37 @@ static int venus_probe(struct platform_device *pdev)
if (!core->pm_ops)
return -ENODEV;
+ core->opp_table = dev_pm_opp_set_clkname(dev, "core");
+ if (IS_ERR(core->opp_table))
+ return PTR_ERR(core->opp_table);
+
+ if (core->res->opp_pmdomain) {
+ ret = dev_pm_opp_of_add_table(dev);
+ if (!ret) {
+ core->has_opp_table = true;
+ } else if (ret != -ENODEV) {
+ dev_err(dev, "invalid OPP table in device tree\n");
+ return ret;
+ }
+ }
+
Can we move those dev_pm_opp_xxx invocations into pm_ops->core_get where
the other pmdomains are? The pm_ops abstarction is created exactly for
such pm and clks manipulations.
if (core->pm_ops->core_get) {
ret = core->pm_ops->core_get(dev);
if (ret)
- return ret;
+ goto err_opp_cleanup;
}
ret = dma_set_mask_and_coherent(dev, core->res->dma_mask);
if (ret)
- return ret;
+ goto err_opp_cleanup;
if (!dev->dma_parms) {
dev->dma_parms = devm_kzalloc(dev, sizeof(*dev->dma_parms),
GFP_KERNEL);
- if (!dev->dma_parms)
- return -ENOMEM;
+ if (!dev->dma_parms) {
+ ret = -ENOMEM;
+ goto err_opp_cleanup;
+ }
}
dma_set_max_seg_size(dev, DMA_BIT_MASK(32));
@@ -242,11 +259,11 @@ static int venus_probe(struct platform_device *pdev)
IRQF_TRIGGER_HIGH | IRQF_ONESHOT,
"venus", core);
if (ret)
- return ret;
+ goto err_opp_cleanup;
ret = hfi_create(core, &venus_core_ops);
if (ret)
- return ret;
+ goto err_opp_cleanup;
pm_runtime_enable(dev);
@@ -302,6 +319,10 @@ static int venus_probe(struct platform_device *pdev)
pm_runtime_set_suspended(dev);
pm_runtime_disable(dev);
hfi_destroy(core);
+err_opp_cleanup:
+ if (core->has_opp_table)
+ dev_pm_opp_of_remove_table(dev);
+ dev_pm_opp_put_clkname(core->opp_table);
this also belongs to pm_ops->core_put but it is missing in the .probe
error path.
+ if (core->pm_ops->core_put)
+ core->pm_ops->core_put(dev);
above addition should be separate patch I guess.
return ret;
}
@@ -326,6 +347,10 @@ static int venus_remove(struct platform_device *pdev)
pm_runtime_put_sync(dev);
pm_runtime_disable(dev);
+ if (core->has_opp_table)
+ dev_pm_opp_of_remove_table(dev);
+ dev_pm_opp_put_clkname(core->opp_table);
+
those also should be moved to core_put
if (pm_ops->core_put)
pm_ops->core_put(dev);
@@ -355,6 +380,10 @@ static __maybe_unused int venus_runtime_suspend(struct device *dev)
if (ret)
return ret;
+ /* Drop the performance state vote */
+ if (core->opp_pmdomain)
+ dev_pm_opp_set_rate(dev, 0);
+
move this in core_power(OFF)
if (pm_ops->core_power)
ret = pm_ops->core_power(dev, POWER_OFF);
@@ -520,6 +549,7 @@ static const struct venus_resources sdm845_res_v2 = {
.vcodec_clks_num = 2,
.vcodec_pmdomains = { "venus", "vcodec0", "vcodec1" },
.vcodec_pmdomains_num = 3,
+ .opp_pmdomain = (const char *[]) { "cx", NULL },
.vcodec_num = 2,
.max_load = 3110400, /* 4096x2160@90 */
.hfi_version = HFI_VERSION_4XX,
@@ -565,6 +595,7 @@ static const struct venus_resources sc7180_res = {
.vcodec_clks_num = 2,
.vcodec_pmdomains = { "venus", "vcodec0" },
.vcodec_pmdomains_num = 2,
+ .opp_pmdomain = (const char *[]) { "cx", NULL },
.vcodec_num = 1,
.hfi_version = HFI_VERSION_4XX,
.vmem_id = VIDC_RESOURCE_NONE,
diff --git a/drivers/media/platform/qcom/venus/core.h b/drivers/media/platform/qcom/venus/core.h
index 7118612..b0cc544 100644
--- a/drivers/media/platform/qcom/venus/core.h
+++ b/drivers/media/platform/qcom/venus/core.h
@@ -62,6 +62,7 @@ struct venus_resources {
unsigned int vcodec_clks_num;
const char * const vcodec_pmdomains[VIDC_PMDOMAINS_NUM_MAX];
unsigned int vcodec_pmdomains_num;
+ const char **opp_pmdomain;
unsigned int vcodec_num;
enum hfi_version hfi_version;
u32 max_load;
@@ -145,8 +146,12 @@ struct venus_core {
struct clk *vcodec1_clks[VIDC_VCODEC_CLKS_NUM_MAX];
struct icc_path *video_path;
struct icc_path *cpucfg_path;
+ struct opp_table *opp_table;
+ bool has_opp_table;
struct device_link *pd_dl_venus;
struct device *pmdomains[VIDC_PMDOMAINS_NUM_MAX];
+ struct device_link *opp_dl_venus;
+ struct device *opp_pmdomain;
struct video_device *vdev_dec;
struct video_device *vdev_enc;
struct v4l2_device v4l2_dev;
diff --git a/drivers/media/platform/qcom/venus/pm_helpers.c b/drivers/media/platform/qcom/venus/pm_helpers.c
index abf9315..4149ab8 100644
--- a/drivers/media/platform/qcom/venus/pm_helpers.c
+++ b/drivers/media/platform/qcom/venus/pm_helpers.c
@@ -9,6 +9,7 @@
#include <linux/iopoll.h>
#include <linux/kernel.h>
#include <linux/pm_domain.h>
+#include <linux/pm_opp.h>
#include <linux/pm_runtime.h>
#include <linux/types.h>
#include <media/v4l2-mem2mem.h>
@@ -66,10 +67,9 @@ static void core_clks_disable(struct venus_core *core)
static int core_clks_set_rate(struct venus_core *core, unsigned long freq)
{
- struct clk *clk = core->clks[0];
int ret;
- ret = clk_set_rate(clk, freq);
+ ret = dev_pm_opp_set_rate(core->dev, freq);
if (ret)
return ret;
@@ -740,13 +740,16 @@ static int venc_power_v4(struct device *dev, int on)
static int vcodec_domains_get(struct device *dev)
{
+ int ret;
+ struct opp_table *opp_table;
+ struct device **opp_virt_dev;
struct venus_core *core = dev_get_drvdata(dev);
const struct venus_resources *res = core->res;
struct device *pd;
unsigned int i;
if (!res->vcodec_pmdomains_num)
- return -ENODEV;
+ goto skip_pmdomains;
for (i = 0; i < res->vcodec_pmdomains_num; i++) {
pd = dev_pm_domain_attach_by_name(dev,
@@ -763,7 +766,41 @@ static int vcodec_domains_get(struct device *dev)
if (!core->pd_dl_venus)
return -ENODEV;
+skip_pmdomains:
+ if (!core->has_opp_table)
+ return 0;
+
+ /* Attach the power domain for setting performance state */
+ opp_table = dev_pm_opp_attach_genpd(dev, res->opp_pmdomain, &opp_virt_dev);
+ if (IS_ERR(opp_table)) {
+ ret = PTR_ERR(opp_table);
+ goto opp_attach_err;
+ }
+
+ core->opp_pmdomain = *opp_virt_dev;
+ core->opp_dl_venus = device_link_add(dev, core->opp_pmdomain,
+ DL_FLAG_RPM_ACTIVE |
+ DL_FLAG_PM_RUNTIME |
+ DL_FLAG_STATELESS);
+ if (!core->opp_dl_venus) {
+ ret = -ENODEV;
+ goto opp_dl_add_err;
+ }
+
return 0;
+
+opp_dl_add_err:
+ dev_pm_domain_detach(core->opp_pmdomain, true);
+opp_attach_err:
+ if (core->pd_dl_venus) {
+ device_link_del(core->pd_dl_venus);
+ for (i = 0; i < res->vcodec_pmdomains_num; i++) {
+ if (IS_ERR_OR_NULL(core->pmdomains[i]))
+ continue;
+ dev_pm_domain_detach(core->pmdomains[i], true);
+ }
+ }
+ return ret;
}
static void vcodec_domains_put(struct device *dev)
@@ -773,7 +810,7 @@ static void vcodec_domains_put(struct device *dev)
unsigned int i;
if (!res->vcodec_pmdomains_num)
- return;
+ goto skip_pmdomains;
if (core->pd_dl_venus)
device_link_del(core->pd_dl_venus);
@@ -783,6 +820,15 @@ static void vcodec_domains_put(struct device *dev)
continue;
dev_pm_domain_detach(core->pmdomains[i], true);
}
+
+skip_pmdomains:
+ if (!core->has_opp_table)
+ return;
+
+ if (core->opp_dl_venus)
+ device_link_del(core->opp_dl_venus);
+
+ dev_pm_domain_detach(core->opp_pmdomain, true);
}
static int core_get_v4(struct device *dev)
--
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