From e5fd91f1ef340da553f7a79da9540c3db711c937 Mon Sep 17 00:00:00 2001
From: André Fabian Silva Delgado <emulatorman@parabola.nu>
Date: Tue, 8 Sep 2015 01:01:14 -0300
Subject: Linux-libre 4.2-gnu

---
 drivers/gpu/drm/msm/dsi/pll/dsi_pll.c | 164 ++++++++++++++++++++++++++++++++++
 1 file changed, 164 insertions(+)
 create mode 100644 drivers/gpu/drm/msm/dsi/pll/dsi_pll.c

(limited to 'drivers/gpu/drm/msm/dsi/pll/dsi_pll.c')

diff --git a/drivers/gpu/drm/msm/dsi/pll/dsi_pll.c b/drivers/gpu/drm/msm/dsi/pll/dsi_pll.c
new file mode 100644
index 000000000..509376fdd
--- /dev/null
+++ b/drivers/gpu/drm/msm/dsi/pll/dsi_pll.c
@@ -0,0 +1,164 @@
+/*
+ * Copyright (c) 2012-2015, The Linux Foundation. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 and
+ * only version 2 as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#include "dsi_pll.h"
+
+static int dsi_pll_enable(struct msm_dsi_pll *pll)
+{
+	int i, ret = 0;
+
+	/*
+	 * Certain PLLs do not allow VCO rate update when it is on.
+	 * Keep track of their status to turn on/off after set rate success.
+	 */
+	if (unlikely(pll->pll_on))
+		return 0;
+
+	/* Try all enable sequences until one succeeds */
+	for (i = 0; i < pll->en_seq_cnt; i++) {
+		ret = pll->enable_seqs[i](pll);
+		DBG("DSI PLL %s after sequence #%d",
+			ret ? "unlocked" : "locked", i + 1);
+		if (!ret)
+			break;
+	}
+
+	if (ret) {
+		DRM_ERROR("DSI PLL failed to lock\n");
+		return ret;
+	}
+
+	pll->pll_on = true;
+
+	return 0;
+}
+
+static void dsi_pll_disable(struct msm_dsi_pll *pll)
+{
+	if (unlikely(!pll->pll_on))
+		return;
+
+	pll->disable_seq(pll);
+
+	pll->pll_on = false;
+}
+
+/*
+ * DSI PLL Helper functions
+ */
+long msm_dsi_pll_helper_clk_round_rate(struct clk_hw *hw,
+		unsigned long rate, unsigned long *parent_rate)
+{
+	struct msm_dsi_pll *pll = hw_clk_to_pll(hw);
+
+	if      (rate < pll->min_rate)
+		return  pll->min_rate;
+	else if (rate > pll->max_rate)
+		return  pll->max_rate;
+	else
+		return rate;
+}
+
+int msm_dsi_pll_helper_clk_prepare(struct clk_hw *hw)
+{
+	struct msm_dsi_pll *pll = hw_clk_to_pll(hw);
+	int ret;
+
+	/*
+	 * Certain PLLs need to update the same VCO rate and registers
+	 * after resume in suspend/resume scenario.
+	 */
+	if (pll->restore_state) {
+		ret = pll->restore_state(pll);
+		if (ret)
+			goto error;
+	}
+
+	ret = dsi_pll_enable(pll);
+
+error:
+	return ret;
+}
+
+void msm_dsi_pll_helper_clk_unprepare(struct clk_hw *hw)
+{
+	struct msm_dsi_pll *pll = hw_clk_to_pll(hw);
+
+	if (pll->save_state)
+		pll->save_state(pll);
+
+	dsi_pll_disable(pll);
+}
+
+void msm_dsi_pll_helper_unregister_clks(struct platform_device *pdev,
+					struct clk **clks, u32 num_clks)
+{
+	of_clk_del_provider(pdev->dev.of_node);
+
+	if (!num_clks || !clks)
+		return;
+
+	do {
+		clk_unregister(clks[--num_clks]);
+		clks[num_clks] = NULL;
+	} while (num_clks);
+}
+
+/*
+ * DSI PLL API
+ */
+int msm_dsi_pll_get_clk_provider(struct msm_dsi_pll *pll,
+	struct clk **byte_clk_provider, struct clk **pixel_clk_provider)
+{
+	if (pll->get_provider)
+		return pll->get_provider(pll,
+					byte_clk_provider,
+					pixel_clk_provider);
+
+	return -EINVAL;
+}
+
+void msm_dsi_pll_destroy(struct msm_dsi_pll *pll)
+{
+	if (pll->destroy)
+		pll->destroy(pll);
+}
+
+struct msm_dsi_pll *msm_dsi_pll_init(struct platform_device *pdev,
+			enum msm_dsi_phy_type type, int id)
+{
+	struct device *dev = &pdev->dev;
+	struct msm_dsi_pll *pll;
+
+	switch (type) {
+	case MSM_DSI_PHY_28NM_HPM:
+	case MSM_DSI_PHY_28NM_LP:
+		pll = msm_dsi_pll_28nm_init(pdev, type, id);
+		break;
+	default:
+		pll = ERR_PTR(-ENXIO);
+		break;
+	}
+
+	if (IS_ERR(pll)) {
+		dev_err(dev, "%s: failed to init DSI PLL\n", __func__);
+		return NULL;
+	}
+
+	pll->type = type;
+
+	DBG("DSI:%d PLL registered", id);
+
+	return pll;
+}
+
-- 
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