[RFC v2 10/11] drm/msm: dsi: Use OPP API to set clk/perf state

Rajendra Nayak
2019-03-20T09:50:29Z

On SDM845 DSI needs to express a perforamnce state
requirement on a power domain depending on the clock rates.
Use OPP table from DT to register with OPP framework and use
dev_pm_opp_set_rate() to set the clk/perf state.

Signed-off-by: Rajendra Nayak <rnayak@codeaurora.org>
---
drivers/gpu/drm/msm/dsi/dsi.h | 2 +
drivers/gpu/drm/msm/dsi/dsi_cfg.c | 4 +-
drivers/gpu/drm/msm/dsi/dsi_host.c | 88 +++++++++++++++++++++++++++---
3 files changed, 84 insertions(+), 10 deletions(-)

diff --git a/drivers/gpu/drm/msm/dsi/dsi.h b/drivers/gpu/drm/msm/dsi/dsi.h
index 9c6b31c2d79f..b4398a798370 100644
--- a/drivers/gpu/drm/msm/dsi/dsi.h
+++ b/drivers/gpu/drm/msm/dsi/dsi.h
@@ -188,8 +188,10 @@ int msm_dsi_runtime_suspend(struct device *dev);
int msm_dsi_runtime_resume(struct device *dev);
int dsi_link_clk_enable_6g(struct msm_dsi_host *msm_host);
int dsi_link_clk_enable_v2(struct msm_dsi_host *msm_host);
+int dsi_link_clk_enable_6g_v2(struct msm_dsi_host *msm_host);
void dsi_link_clk_disable_6g(struct msm_dsi_host *msm_host);
void dsi_link_clk_disable_v2(struct msm_dsi_host *msm_host);
+void dsi_link_clk_disable_6g_v2(struct msm_dsi_host *msm_host);
int dsi_tx_buf_alloc_6g(struct msm_dsi_host *msm_host, int size);
int dsi_tx_buf_alloc_v2(struct msm_dsi_host *msm_host, int size);
void *dsi_tx_buf_get_6g(struct msm_dsi_host *msm_host);
diff --git a/drivers/gpu/drm/msm/dsi/dsi_cfg.c b/drivers/gpu/drm/msm/dsi/dsi_cfg.c
index dcdfb1bb54f9..c18532f92e4a 100644
--- a/drivers/gpu/drm/msm/dsi/dsi_cfg.c
+++ b/drivers/gpu/drm/msm/dsi/dsi_cfg.c
@@ -159,8 +159,8 @@ const static struct msm_dsi_host_cfg_ops msm_dsi_6g_host_ops = {
};

const static struct msm_dsi_host_cfg_ops msm_dsi_6g_v2_host_ops = {
- .link_clk_enable = dsi_link_clk_enable_6g,
- .link_clk_disable = dsi_link_clk_disable_6g,
+ .link_clk_enable = dsi_link_clk_enable_6g_v2,
+ .link_clk_disable = dsi_link_clk_disable_6g_v2,
.clk_init_ver = dsi_clk_init_6g_v2,
.tx_buf_alloc = dsi_tx_buf_alloc_6g,
.tx_buf_get = dsi_tx_buf_get_6g,
diff --git a/drivers/gpu/drm/msm/dsi/dsi_host.c b/drivers/gpu/drm/msm/dsi/dsi_host.c
index 610183db1daf..6ed9e6a0520c 100644
--- a/drivers/gpu/drm/msm/dsi/dsi_host.c
+++ b/drivers/gpu/drm/msm/dsi/dsi_host.c
@@ -21,6 +21,7 @@
#include <linux/of_gpio.h>
#include <linux/of_irq.h>
#include <linux/pinctrl/consumer.h>
+#include <linux/pm_opp.h>
#include <linux/of_graph.h>
#include <linux/regulator/consumer.h>
#include <linux/spinlock.h>
@@ -511,7 +512,7 @@ int msm_dsi_runtime_resume(struct device *dev)
return dsi_bus_clk_enable(msm_host);
}

-int dsi_link_clk_enable_6g(struct msm_dsi_host *msm_host)
+static int dsi_link_clk_set_rate_6g(struct msm_dsi_host *msm_host)
{
int ret;

@@ -521,29 +522,65 @@ int dsi_link_clk_enable_6g(struct msm_dsi_host *msm_host)
ret = clk_set_rate(msm_host->byte_clk, msm_host->byte_clk_rate);
if (ret) {
pr_err("%s: Failed to set rate byte clk, %d\n", __func__, ret);
- goto error;
+ return ret;
}

ret = clk_set_rate(msm_host->pixel_clk, msm_host->pixel_clk_rate);
if (ret) {
pr_err("%s: Failed to set rate pixel clk, %d\n", __func__, ret);
- goto error;
+ return ret;
}

if (msm_host->byte_intf_clk) {
ret = clk_set_rate(msm_host->byte_intf_clk,
msm_host->byte_clk_rate / 2);
- if (ret) {
+ if (ret)
+ pr_err("%s: Failed to set rate byte intf clk, %d\n",
+ __func__, ret);
+ }
+
+ return ret;
+}
+
+static int dsi_link_clk_set_rate_6g_v2(struct msm_dsi_host *msm_host)
+{
+ int ret;
+ struct device *dev = &msm_host->pdev->dev;
+
+ DBG("Set clk rates: pclk=%d, byteclk=%d",
+ msm_host->mode->clock, msm_host->byte_clk_rate);
+
+ ret = dev_pm_opp_set_rate(dev, msm_host->byte_clk_rate);
+ if (ret) {
+ pr_err("%s: dev_pm_opp_set_rate failed %d\n", __func__, ret);
+ return ret;
+ }
+
+ ret = clk_set_rate(msm_host->pixel_clk, msm_host->pixel_clk_rate);
+ if (ret) {
+ pr_err("%s: Failed to set rate pixel clk, %d\n", __func__, ret);
+ return ret;
+ }
+
+ if (msm_host->byte_intf_clk) {
+ ret = clk_set_rate(msm_host->byte_intf_clk,
+ msm_host->byte_clk_rate / 2);
+ if (ret)
pr_err("%s: Failed to set rate byte intf clk, %d\n",
__func__, ret);
- goto error;
- }
}

+ return ret;
+}
+
+static int dsi_link_clk_prepare_enable_6g(struct msm_dsi_host *msm_host)
+{
+ int ret;
+
ret = clk_prepare_enable(msm_host->esc_clk);
if (ret) {
pr_err("%s: Failed to enable dsi esc clk\n", __func__);
- goto error;
+ return ret;
}

ret = clk_prepare_enable(msm_host->byte_clk);
@@ -575,10 +612,31 @@ int dsi_link_clk_enable_6g(struct msm_dsi_host *msm_host)
clk_disable_unprepare(msm_host->byte_clk);
byte_clk_err:
clk_disable_unprepare(msm_host->esc_clk);
-error:
return ret;
}

+int dsi_link_clk_enable_6g(struct msm_dsi_host *msm_host)
+{
+ int ret;
+
+ ret = dsi_link_clk_set_rate_6g(msm_host);
+ if (ret)
+ return ret;
+
+ return dsi_link_clk_prepare_enable_6g(msm_host);
+}
+
+int dsi_link_clk_enable_6g_v2(struct msm_dsi_host *msm_host)
+{
+ int ret;
+
+ ret = dsi_link_clk_set_rate_6g_v2(msm_host);
+ if (ret)
+ return ret;
+
+ return dsi_link_clk_prepare_enable_6g(msm_host);
+}
+
int dsi_link_clk_enable_v2(struct msm_dsi_host *msm_host)
{
int ret;
@@ -656,6 +714,13 @@ void dsi_link_clk_disable_6g(struct msm_dsi_host *msm_host)
clk_disable_unprepare(msm_host->byte_clk);
}

+void dsi_link_clk_disable_6g_v2(struct msm_dsi_host *msm_host)
+{
+ /* Drop the performance state vote */
+ dev_pm_opp_set_rate(&msm_host->pdev->dev, 0);
+ dsi_link_clk_disable_6g(msm_host);
+}
+
void dsi_link_clk_disable_v2(struct msm_dsi_host *msm_host)
{
clk_disable_unprepare(msm_host->pixel_clk);
@@ -1864,6 +1929,12 @@ int msm_dsi_host_init(struct msm_dsi *msm_dsi)
goto fail;
}

+ dev_pm_opp_set_clkname(&pdev->dev, "byte");
+
+ ret = dev_pm_opp_of_add_table(&pdev->dev);
+ if (ret < 0)
+ dev_err(&pdev->dev, "failed to init OPP table: %d\n", ret);
+
msm_host->rx_buf = devm_kzalloc(&pdev->dev, SZ_4K, GFP_KERNEL);
if (!msm_host->rx_buf) {
ret = -ENOMEM;
@@ -1896,6 +1967,7 @@ void msm_dsi_host_destroy(struct mipi_dsi_host *host)
struct msm_dsi_host *msm_host = to_msm_dsi_host(host);

DBG("");
+ dev_pm_opp_of_remove_table(&msm_host->pdev->dev);
dsi_tx_buf_free(msm_host);
if (msm_host->workqueue) {
flush_workqueue(msm_host->workqueue);