From: Thierry Reding <treding@xxxxxxxxxx>
This is a small helper that performs the basic steps required by all
output drivers to prepare the display controller for use with a given
encoder.
Signed-off-by: Thierry Reding <treding@xxxxxxxxxx>
---
drivers/gpu/drm/tegra/dc.c | 20 ++++++++++++++++++++
drivers/gpu/drm/tegra/drm.h | 2 ++
2 files changed, 22 insertions(+)
diff --git a/drivers/gpu/drm/tegra/dc.c b/drivers/gpu/drm/tegra/dc.c
index 46fde25863a2..39e1b3b38536 100644
--- a/drivers/gpu/drm/tegra/dc.c
+++ b/drivers/gpu/drm/tegra/dc.c
@@ -1099,6 +1099,26 @@ static int tegra_crtc_setup_clk(struct drm_crtc *crtc,
return 0;
}
+int tegra_dc_setup_clock(struct tegra_dc *dc, struct clk *parent,
+ unsigned long pclk, unsigned int div)
+{
+ u32 value;
+ int err;
+
+ err = clk_set_parent(dc->clk, parent);
+ if (err < 0) {
+ dev_err(dc->dev, "failed to set parent clock: %d\n", err);
+ return err;
+ }
+
+ DRM_DEBUG_KMS("rate: %lu, div: %u\n", clk_get_rate(dc->clk), div);
+
+ value = SHIFT_CLK_DIVIDER(div) | PIXEL_CLK_DIVIDER_PCD1;
+ tegra_dc_writel(dc, value, DC_DISP_DISP_CLOCK_CONTROL);
+
+ return 0;
+}
+
static int tegra_crtc_mode_set(struct drm_crtc *crtc,
struct drm_display_mode *mode,
struct drm_display_mode *adjusted,
diff --git a/drivers/gpu/drm/tegra/drm.h b/drivers/gpu/drm/tegra/drm.h
index d7433976a40b..e1374ec2b76e 100644
--- a/drivers/gpu/drm/tegra/drm.h
+++ b/drivers/gpu/drm/tegra/drm.h
@@ -178,6 +178,8 @@ void tegra_dc_enable_vblank(struct tegra_dc *dc);
void tegra_dc_disable_vblank(struct tegra_dc *dc);
void tegra_dc_cancel_page_flip(struct drm_crtc *crtc, struct drm_file *file);
void tegra_dc_commit(struct tegra_dc *dc);
+int tegra_dc_setup_clock(struct tegra_dc *dc, struct clk *parent,
+ unsigned long pclk, unsigned int div);
struct tegra_output_ops {
int (*enable)(struct tegra_output *output);
--
2.1.3
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