From: Thierry Reding Date: Mon, 8 Dec 2014 16:26:46 +0000 (+0100) Subject: drm/tegra: sor: Implement ->atomic_check() X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=82f1511c35643575e6f28013a3bb348e35676491;p=linux-beck.git drm/tegra: sor: 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 --- diff --git a/drivers/gpu/drm/tegra/sor.c b/drivers/gpu/drm/tegra/sor.c index 2793e75c6573..7463ea02a083 100644 --- a/drivers/gpu/drm/tegra/sor.c +++ b/drivers/gpu/drm/tegra/sor.c @@ -1320,6 +1320,27 @@ unlock: mutex_unlock(&sor->lock); } +static int +tegra_sor_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_sor *sor = to_sor(output); + int err; + + err = tegra_dc_state_setup_clock(dc, crtc_state, sor->clk_parent, + pclk, 0); + if (err < 0) { + dev_err(output->dev, "failed to setup CRTC state: %d\n", err); + return err; + } + + return 0; +} + static const struct drm_encoder_helper_funcs tegra_sor_encoder_helper_funcs = { .dpms = tegra_sor_encoder_dpms, .mode_fixup = tegra_sor_encoder_mode_fixup, @@ -1327,6 +1348,7 @@ static const struct drm_encoder_helper_funcs tegra_sor_encoder_helper_funcs = { .commit = tegra_sor_encoder_commit, .mode_set = tegra_sor_encoder_mode_set, .disable = tegra_sor_encoder_disable, + .atomic_check = tegra_sor_encoder_atomic_check, }; static int tegra_sor_init(struct host1x_client *client)