From 3cebae6737b100323baca21de6bce6647249e778 Mon Sep 17 00:00:00 2001 From: Thierry Reding Date: Wed, 17 Dec 2014 17:04:36 +0100 Subject: [PATCH] drm/tegra: rgb: Implement ->atomic_check() The implementation of the ->atomic_check() callback precomputes all parameters to check if the given configuration can be applied. If so the precomputed values are stored in the atomic state object for the encoder and applied during modeset. In that way the modeset no longer needs to perform any checking but simply program values into registers. Signed-off-by: Thierry Reding --- drivers/gpu/drm/tegra/rgb.c | 42 ++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 42 insertions(+) diff --git a/drivers/gpu/drm/tegra/rgb.c b/drivers/gpu/drm/tegra/rgb.c index 78e3cb1..be1b389 100644 --- a/drivers/gpu/drm/tegra/rgb.c +++ b/drivers/gpu/drm/tegra/rgb.c @@ -235,6 +235,47 @@ static void tegra_rgb_encoder_disable(struct drm_encoder *encoder) drm_panel_unprepare(output->panel); } +static int +tegra_rgb_encoder_atomic_check(struct drm_encoder *encoder, + struct drm_crtc_state *crtc_state, + struct drm_connector_state *conn_state) +{ + struct tegra_output *output = encoder_to_output(encoder); + struct tegra_dc *dc = to_tegra_dc(conn_state->crtc); + unsigned long pclk = crtc_state->mode.clock * 1000; + struct tegra_rgb *rgb = to_rgb(output); + unsigned int div; + int err; + + /* + * We may not want to change the frequency of the parent clock, since + * it may be a parent for other peripherals. This is due to the fact + * that on Tegra20 there's only a single clock dedicated to display + * (pll_d_out0), whereas later generations have a second one that can + * be used to independently drive a second output (pll_d2_out0). + * + * As a way to support multiple outputs on Tegra20 as well, pll_p is + * typically used as the parent clock for the display controllers. + * But this comes at a cost: pll_p is the parent of several other + * peripherals, so its frequency shouldn't change out of the blue. + * + * The best we can do at this point is to use the shift clock divider + * and hope that the desired frequency can be matched (or at least + * matched sufficiently close that the panel will still work). + */ + div = ((clk_get_rate(rgb->clk) * 2) / pclk) - 2; + pclk = 0; + + err = tegra_dc_state_setup_clock(dc, crtc_state, rgb->clk_parent, + pclk, div); + if (err < 0) { + dev_err(output->dev, "failed to setup CRTC state: %d\n", err); + return err; + } + + return err; +} + static const struct drm_encoder_helper_funcs tegra_rgb_encoder_helper_funcs = { .dpms = tegra_rgb_encoder_dpms, .mode_fixup = tegra_rgb_encoder_mode_fixup, @@ -242,6 +283,7 @@ static const struct drm_encoder_helper_funcs tegra_rgb_encoder_helper_funcs = { .commit = tegra_rgb_encoder_commit, .mode_set = tegra_rgb_encoder_mode_set, .disable = tegra_rgb_encoder_disable, + .atomic_check = tegra_rgb_encoder_atomic_check, }; int tegra_dc_rgb_probe(struct tegra_dc *dc) -- 2.7.4