From c5a107d3279734c3599136696b6790add9e8e798 Mon Sep 17 00:00:00 2001 From: Thierry Reding Date: Tue, 2 Dec 2014 15:15:06 +0100 Subject: [PATCH] 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: Thierry Reding --- 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 e35e10758556..90909883e739 100644 --- a/drivers/gpu/drm/tegra/dc.c +++ b/drivers/gpu/drm/tegra/dc.c @@ -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, 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);