linux-kernel - [PATCH v7 13/37] drm/tegra: hdmi: Add OPP support

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Date:   Fri,  2 Jul 2021 02:27:04 +0300
From:   Dmitry Osipenko <digetx@...il.com>
To:     Thierry Reding <thierry.reding@...il.com>,
        Jonathan Hunter <jonathanh@...dia.com>,
        Ulf Hansson <ulf.hansson@...aro.org>,
        Viresh Kumar <vireshk@...nel.org>,
        Stephen Boyd <sboyd@...nel.org>,
        Peter De Schrijver <pdeschrijver@...dia.com>
Cc:     linux-kernel@...r.kernel.org, linux-tegra@...r.kernel.org,
        linux-pm@...r.kernel.org
Subject: [PATCH v7 13/37] drm/tegra: hdmi: Add OPP support

The HDMI on Tegra belongs to the core power domain and we're going to
enable GENPD support for the core domain. Now HDMI driver must use
OPP API for driving the controller's clock rate because OPP API takes
care of reconfiguring the domain's performance state in accordance to
the clock rate. Add OPP support to the HDMI driver.

Signed-off-by: Dmitry Osipenko <digetx@...il.com>
---
 drivers/gpu/drm/tegra/hdmi.c | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/tegra/hdmi.c b/drivers/gpu/drm/tegra/hdmi.c
index e5d2a4026028..5b5d174c5a2b 100644
--- a/drivers/gpu/drm/tegra/hdmi.c
+++ b/drivers/gpu/drm/tegra/hdmi.c
@@ -11,10 +11,13 @@
 #include <linux/math64.h>
 #include <linux/module.h>
 #include <linux/of_device.h>
+#include <linux/pm_opp.h>
 #include <linux/pm_runtime.h>
 #include <linux/regulator/consumer.h>
 #include <linux/reset.h>
 
+#include <soc/tegra/common.h>
+
 #include <drm/drm_atomic_helper.h>
 #include <drm/drm_crtc.h>
 #include <drm/drm_debugfs.h>
@@ -1195,7 +1198,7 @@ static void tegra_hdmi_encoder_enable(struct drm_encoder *encoder)
 	h_back_porch = mode->htotal - mode->hsync_end;
 	h_front_porch = mode->hsync_start - mode->hdisplay;
 
-	err = clk_set_rate(hdmi->clk, hdmi->pixel_clock);
+	err = dev_pm_opp_set_rate(hdmi->dev, hdmi->pixel_clock);
 	if (err < 0) {
 		dev_err(hdmi->dev, "failed to set HDMI clock frequency: %d\n",
 			err);
@@ -1708,6 +1711,10 @@ static int tegra_hdmi_probe(struct platform_device *pdev)
 
 	hdmi->output.dev = &pdev->dev;
 
+	err = devm_tegra_core_dev_init_opp_table_simple(&pdev->dev);
+	if (err)
+		return err;
+
 	err = tegra_output_probe(&hdmi->output);
 	if (err < 0)
 		return err;
-- 
2.30.2