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disp: msm: vote for reg bus during rsc pm_runtime events

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Add reg bus vote separate for RSC on top of the SDE
driver vote during the pm_runtime suspend/resume
events to avoid register access issues.

Change-Id: Ifbaead747b7b10db107696c8cce8e1ecfae5e0f8
Signed-off-by: Veera Sundaram Sankaran <veeras@codeaurora.org>
This commit is contained in:
Veera Sundaram Sankaran
2019-08-26 16:02:05 -07:00
parent 220f4941da
commit 386dd329c5
1 changed files with 26 additions and 1 deletions
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27
msm/sde_rsc.c
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@@ -16,6 +16,7 @@
#include <linux/of_platform.h>
#include <linux/module.h>
#include <linux/pm_runtime.h>
#include <linux/msm-bus.h>
#include <soc/qcom/rpmh.h>
#include <drm/drmP.h>
@@ -1317,6 +1318,7 @@ static int sde_rsc_runtime_suspend(struct device *dev)
{
struct sde_rsc_priv *rsc = dev_get_drvdata(dev);
struct dss_module_power *mp;
u32 reg_bus_hdl;
if (!rsc) {
pr_err("invalid drv data\n");
@@ -1325,6 +1327,10 @@ static int sde_rsc_runtime_suspend(struct device *dev)
mp = &rsc->phandle.mp;
msm_dss_enable_clk(mp->clk_config, mp->num_clk, false);
reg_bus_hdl = rsc->phandle.reg_bus_hdl;
if (reg_bus_hdl)
msm_bus_scale_client_update_request(reg_bus_hdl,
VOTE_INDEX_DISABLE);
msm_dss_enable_vreg(mp->vreg_config, mp->num_vreg, false);
return 0;
@@ -1335,6 +1341,7 @@ static int sde_rsc_runtime_resume(struct device *dev)
struct sde_rsc_priv *rsc = dev_get_drvdata(dev);
struct dss_module_power *mp;
int rc = 0;
u32 reg_bus_hdl;
if (!rsc) {
pr_err("invalid drv data\n");
@@ -1348,12 +1355,30 @@ static int sde_rsc_runtime_resume(struct device *dev)
goto end;
}
reg_bus_hdl = rsc->phandle.reg_bus_hdl;
if (reg_bus_hdl) {
rc = msm_bus_scale_client_update_request(reg_bus_hdl,
VOTE_INDEX_LOW);
if (rc) {
pr_err("failed to set reg bus vote rc=%d\n", rc);
goto reg_bus_hdl_err;
}
}
rc = msm_dss_enable_clk(mp->clk_config, mp->num_clk, true);
if (rc) {
pr_err("clock enable failed rc:%d\n", rc);
msm_dss_enable_vreg(mp->vreg_config, mp->num_vreg, false);
goto clk_err;
}
return rc;
clk_err:
if (reg_bus_hdl)
msm_bus_scale_client_update_request(reg_bus_hdl,
VOTE_INDEX_DISABLE);
reg_bus_hdl_err:
msm_dss_enable_vreg(mp->vreg_config, mp->num_vreg, false);
end:
return rc;
}