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firmware: qcom_scm: Add bw voting support to the SCM interface 

The SMC calls required by remoteproc PAS driver on SM8450 SoCs get a
performance benefit from having a max vote to the crypto->ddr path.
Add support for bandwidth (bw) voting for those SMC calls when the
interconnects property is specified.

Signed-off-by: Sibi Sankar <quic_sibis@quicinc.com>
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Link: https://lore.kernel.org/r/1653289258-17699-3-git-send-email-quic_sibis@quicinc.com
This commit is contained in:
Sibi Sankar 2022-05-23 12:30:57 +05:30 committed by Bjorn Andersson
parent 7f045132bc
commit 65b7ebda50
1 changed files with 69 additions and 0 deletions
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69
drivers/firmware/qcom_scm.c
View File

@ -7,6 +7,7 @@
#include <linux/cpumask.h>
#include <linux/export.h>
#include <linux/dma-mapping.h>
#include <linux/interconnect.h>
#include <linux/module.h>
#include <linux/types.h>
#include <linux/qcom_scm.h>
@ -31,8 +32,13 @@ struct qcom_scm {
struct clk *core_clk;
struct clk *iface_clk;
struct clk *bus_clk;
struct icc_path *path;
struct reset_controller_dev reset;
/* control access to the interconnect path */
struct mutex scm_bw_lock;
int scm_vote_count;
u64 dload_mode_addr;
};
@ -99,6 +105,42 @@ static void qcom_scm_clk_disable(void)
clk_disable_unprepare(__scm->bus_clk);
}
static int qcom_scm_bw_enable(void)
{
int ret = 0;
if (!__scm->path)
return 0;
if (IS_ERR(__scm->path))
return -EINVAL;
mutex_lock(&__scm->scm_bw_lock);
if (!__scm->scm_vote_count) {
ret = icc_set_bw(__scm->path, 0, UINT_MAX);
if (ret < 0) {
dev_err(__scm->dev, "failed to set bandwidth request\n");
goto err_bw;
}
}
__scm->scm_vote_count++;
err_bw:
mutex_unlock(&__scm->scm_bw_lock);
return ret;
}
static void qcom_scm_bw_disable(void)
{
if (IS_ERR_OR_NULL(__scm->path))
return;
mutex_lock(&__scm->scm_bw_lock);
if (__scm->scm_vote_count-- == 1)
icc_set_bw(__scm->path, 0, 0);
mutex_unlock(&__scm->scm_bw_lock);
}
enum qcom_scm_convention qcom_scm_convention = SMC_CONVENTION_UNKNOWN;
static DEFINE_SPINLOCK(scm_query_lock);
@ -444,10 +486,15 @@ int qcom_scm_pas_init_image(u32 peripheral, const void *metadata, size_t size,
if (ret)
goto out;
ret = qcom_scm_bw_enable();
if (ret)
return ret;
desc.args[1] = mdata_phys;
ret = qcom_scm_call(__scm->dev, &desc, &res);
qcom_scm_bw_disable();
qcom_scm_clk_disable();
out:
@ -507,7 +554,12 @@ int qcom_scm_pas_mem_setup(u32 peripheral, phys_addr_t addr, phys_addr_t size)
if (ret)
return ret;
ret = qcom_scm_bw_enable();
if (ret)
return ret;
ret = qcom_scm_call(__scm->dev, &desc, &res);
qcom_scm_bw_disable();
qcom_scm_clk_disable();
return ret ? : res.result[0];
@ -537,7 +589,12 @@ int qcom_scm_pas_auth_and_reset(u32 peripheral)
if (ret)
return ret;
ret = qcom_scm_bw_enable();
if (ret)
return ret;
ret = qcom_scm_call(__scm->dev, &desc, &res);
qcom_scm_bw_disable();
qcom_scm_clk_disable();
return ret ? : res.result[0];
@ -566,8 +623,13 @@ int qcom_scm_pas_shutdown(u32 peripheral)
if (ret)
return ret;
ret = qcom_scm_bw_enable();
if (ret)
return ret;
ret = qcom_scm_call(__scm->dev, &desc, &res);
qcom_scm_bw_disable();
qcom_scm_clk_disable();
return ret ? : res.result[0];
@ -1277,8 +1339,15 @@ static int qcom_scm_probe(struct platform_device *pdev)
if (ret < 0)
return ret;
mutex_init(&scm->scm_bw_lock);
clks = (unsigned long)of_device_get_match_data(&pdev->dev);
scm->path = devm_of_icc_get(&pdev->dev, NULL);
if (IS_ERR(scm->path))
return dev_err_probe(&pdev->dev, PTR_ERR(scm->path),
"failed to acquire interconnect path\n");
scm->core_clk = devm_clk_get(&pdev->dev, "core");
if (IS_ERR(scm->core_clk)) {
if (PTR_ERR(scm->core_clk) == -EPROBE_DEFER)