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drm/stm: dsi: add pm runtime ops

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Update control of clocks and supply thanks to the PM runtime
mechanism to avoid kernel crash during a system suspend.

Signed-off-by: Yannick Fertre <yannick.fertre@foss.st.com>
Signed-off-by: Raphael Gallais-Pou <raphael.gallais-pou@foss.st.com>
Acked-by: Yannick Fertre <yannick.fertre@foss.st.com>
Tested-by: Yannick Fertre <yannick.fertre@foss.st.com>
Signed-off-by: Philippe Cornu <philippe.cornu@foss.st.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20240129104106.43141-3-raphael.gallais-pou@foss.st.com
This commit is contained in:
Yannick Fertre 2024-01-29 11:41:05 +01:00 committed by Philippe Cornu
parent 884d7d03e5
commit b0e83c2c85
1 changed files with 18 additions and 6 deletions
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24
drivers/gpu/drm/stm/dw_mipi_dsi-stm.c
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@ -11,6 +11,7 @@
#include <linux/mod_devicetable.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/pm_runtime.h>
#include <linux/regulator/consumer.h>
#include <video/mipi_display.h>
@ -77,6 +78,7 @@ enum dsi_color {
struct dw_mipi_dsi_stm {
void __iomem *base;
struct clk *pllref_clk;
struct clk *pclk;
struct dw_mipi_dsi *dsi;
u32 hw_version;
int lane_min_kbps;
@ -443,7 +445,6 @@ static int dw_mipi_dsi_stm_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
struct dw_mipi_dsi_stm *dsi;
struct clk *pclk;
int ret;
dsi = devm_kzalloc(dev, sizeof(*dsi), GFP_KERNEL);
@ -483,21 +484,21 @@ static int dw_mipi_dsi_stm_probe(struct platform_device *pdev)
goto err_clk_get;
}
pclk = devm_clk_get(dev, "pclk");
if (IS_ERR(pclk)) {
ret = PTR_ERR(pclk);
dsi->pclk = devm_clk_get(dev, "pclk");
if (IS_ERR(dsi->pclk)) {
ret = PTR_ERR(dsi->pclk);
DRM_ERROR("Unable to get peripheral clock: %d\n", ret);
goto err_dsi_probe;
}
ret = clk_prepare_enable(pclk);
ret = clk_prepare_enable(dsi->pclk);
if (ret) {
DRM_ERROR("%s: Failed to enable peripheral clk\n", __func__);
goto err_dsi_probe;
}
dsi->hw_version = dsi_read(dsi, DSI_VERSION) & VERSION;
clk_disable_unprepare(pclk);
clk_disable_unprepare(dsi->pclk);
if (dsi->hw_version != HWVER_130 && dsi->hw_version != HWVER_131) {
ret = -ENODEV;
@ -551,6 +552,7 @@ static int dw_mipi_dsi_stm_suspend(struct device *dev)
DRM_DEBUG_DRIVER("\n");
clk_disable_unprepare(dsi->pllref_clk);
clk_disable_unprepare(dsi->pclk);
regulator_disable(dsi->vdd_supply);
return 0;
@ -569,8 +571,16 @@ static int dw_mipi_dsi_stm_resume(struct device *dev)
return ret;
}
ret = clk_prepare_enable(dsi->pclk);
if (ret) {
regulator_disable(dsi->vdd_supply);
DRM_ERROR("Failed to enable pclk: %d\n", ret);
return ret;
}
ret = clk_prepare_enable(dsi->pllref_clk);
if (ret) {
clk_disable_unprepare(dsi->pclk);
regulator_disable(dsi->vdd_supply);
DRM_ERROR("Failed to enable pllref_clk: %d\n", ret);
return ret;
@ -582,6 +592,8 @@ static int dw_mipi_dsi_stm_resume(struct device *dev)
static const struct dev_pm_ops dw_mipi_dsi_stm_pm_ops = {
SYSTEM_SLEEP_PM_OPS(dw_mipi_dsi_stm_suspend,
dw_mipi_dsi_stm_resume)
RUNTIME_PM_OPS(dw_mipi_dsi_stm_suspend,
dw_mipi_dsi_stm_resume, NULL)
};
static struct platform_driver dw_mipi_dsi_stm_driver = {