linux-kernel - [PATCH 29/36] drm/tegra: sor: Implement ->atomic

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:	Tue, 20 Jan 2015 11:48:48 +0100
From:	Thierry Reding <thierry.reding@...il.com>
To:	dri-devel@...ts.freedesktop.org
Cc:	linux-tegra@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH 29/36] drm/tegra: sor: Implement ->atomic_check()

From: Thierry Reding <treding@...dia.com>

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 <treding@...dia.com>
---
 drivers/gpu/drm/tegra/sor.c | 22 ++++++++++++++++++++++
 1 file changed, 22 insertions(+)

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)
-- 
2.1.3

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/