From: Yannick Fertre <yannick.fertre@xxxxxxxxxxx>
The latest hardware version of the LTDC presents the addition of a bus
clock, which contains the global configuration registers and the interrupt
register.
Signed-off-by: Yannick Fertre <yannick.fertre@xxxxxxxxxxx>
---
drivers/gpu/drm/stm/ltdc.c | 8 ++++++++
drivers/gpu/drm/stm/ltdc.h | 1 +
2 files changed, 9 insertions(+)
diff --git a/drivers/gpu/drm/stm/ltdc.c b/drivers/gpu/drm/stm/ltdc.c
index 5576fdae4962..67064f47a4cb 100644
--- a/drivers/gpu/drm/stm/ltdc.c
+++ b/drivers/gpu/drm/stm/ltdc.c
@@ -1896,6 +1896,8 @@ void ltdc_suspend(struct drm_device *ddev)
DRM_DEBUG_DRIVER("\n");
clk_disable_unprepare(ldev->pixel_clk);
+ if (ldev->bus_clk)
+ clk_disable_unprepare(ldev->bus_clk);
}
int ltdc_resume(struct drm_device *ddev)
@@ -1910,6 +1912,12 @@ int ltdc_resume(struct drm_device *ddev)
DRM_ERROR("failed to enable pixel clock (%d)\n", ret);
return ret;
}
+ if (ldev->bus_clk) {
+ if (clk_prepare_enable(ldev->bus_clk)) {
+ DRM_ERROR("Unable to prepare bus clock\n");
+ return -ENODEV;
+ }
+ }
return 0;
}
diff --git a/drivers/gpu/drm/stm/ltdc.h b/drivers/gpu/drm/stm/ltdc.h
index 9d488043ffdb..155d8e4a7c6b 100644
--- a/drivers/gpu/drm/stm/ltdc.h
+++ b/drivers/gpu/drm/stm/ltdc.h
@@ -44,6 +44,7 @@ struct ltdc_device {
void __iomem *regs;
struct regmap *regmap;
struct clk *pixel_clk; /* lcd pixel clock */
+ struct clk *bus_clk; /* bus clock */
struct mutex err_lock; /* protecting error_status */
struct ltdc_caps caps;
u32 irq_status;
--
2.25.1
