Commit c5a107d3 authored by Thierry Reding's avatar Thierry Reding
Browse files

drm/tegra: Add tegra_dc_setup_clock() helper 



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: default avatarThierry Reding <treding@nvidia.com>
parent d5bae6f3

drivers/gpu/drm/tegra/dc.c

+20 −0
Original line number Diff line number Diff line
@@ -1092,6 +1092,26 @@ 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,

drivers/gpu/drm/tegra/drm.h

+2 −0
Original line number Diff line number Diff line
@@ -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);