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Message-Id: <20230727215141.53910-2-avolmat@me.com>
Date: Thu, 27 Jul 2023 21:51:25 +0000
From: Alain Volmat <avolmat@...com>
To: Alain Volmat <alain.volmat@...s.st.com>,
David Airlie <airlied@...il.com>,
Daniel Vetter <daniel@...ll.ch>,
Philipp Zabel <p.zabel@...gutronix.de>
Cc: Alain Volmat <avolmat@...com>, linux-kernel@...r.kernel.org,
dri-devel@...ts.freedesktop.org
Subject: [PATCH 01/14] drm/sti: add hdmi tx6g0c28 phy for STi platform
Addition of the HDMI TX PHY driver for use in the STiH418
SoC platform and more especially the 4KOpen (B2264) board.
Signed-off-by: Alain Volmat <avolmat@...com>
---
drivers/gpu/drm/sti/Makefile | 1 +
drivers/gpu/drm/sti/sti_hdmi.c | 4 +
drivers/gpu/drm/sti/sti_hdmi_tx6g0c28phy.c | 292 +++++++++++++++++++++
drivers/gpu/drm/sti/sti_hdmi_tx6g0c28phy.h | 13 +
4 files changed, 310 insertions(+)
create mode 100644 drivers/gpu/drm/sti/sti_hdmi_tx6g0c28phy.c
create mode 100644 drivers/gpu/drm/sti/sti_hdmi_tx6g0c28phy.h
diff --git a/drivers/gpu/drm/sti/Makefile b/drivers/gpu/drm/sti/Makefile
index f203ac5514ae..bf52edb7dba5 100644
--- a/drivers/gpu/drm/sti/Makefile
+++ b/drivers/gpu/drm/sti/Makefile
@@ -11,6 +11,7 @@ sti-drm-y := \
sti_plane.o \
sti_hdmi.o \
sti_hdmi_tx3g4c28phy.o \
+ sti_hdmi_tx6g0c28phy.o \
sti_dvo.o \
sti_awg_utils.o \
sti_vtg.o \
diff --git a/drivers/gpu/drm/sti/sti_hdmi.c b/drivers/gpu/drm/sti/sti_hdmi.c
index 500936d5743c..988a5de0fcd2 100644
--- a/drivers/gpu/drm/sti/sti_hdmi.c
+++ b/drivers/gpu/drm/sti/sti_hdmi.c
@@ -27,6 +27,7 @@
#include "sti_hdmi.h"
#include "sti_hdmi_tx3g4c28phy.h"
+#include "sti_hdmi_tx6g0c28phy.h"
#include "sti_vtg.h"
#define HDMI_CFG 0x0000
@@ -1363,6 +1364,9 @@ static const struct of_device_id hdmi_of_match[] = {
{
.compatible = "st,stih407-hdmi",
.data = &tx3g4c28phy_ops,
+ }, {
+ .compatible = "st,stih418-hdmi",
+ .data = &tx6g0c28phy_ops,
}, {
/* end node */
}
diff --git a/drivers/gpu/drm/sti/sti_hdmi_tx6g0c28phy.c b/drivers/gpu/drm/sti/sti_hdmi_tx6g0c28phy.c
new file mode 100644
index 000000000000..7bd260429044
--- /dev/null
+++ b/drivers/gpu/drm/sti/sti_hdmi_tx6g0c28phy.c
@@ -0,0 +1,292 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Author: Alain Volmat <avolmat@...com>
+ *
+ * This driver is highly inspired from sti_hdmi_tx3g4c28phy.c copyright by ST Microelectronics
+ * with IP behavior understood by looking at the display package from 4kopen.com
+ * https://bitbucket.org/4kopen/display/src/master/display/ip/hdmi/stmhdmitx6g0_c28_phy.cpp
+ */
+
+#include <drm/drm_device.h>
+#include <drm/drm_print.h>
+#include <linux/delay.h>
+#include <linux/reset.h>
+
+#include "sti_hdmi_tx6g0c28phy.h"
+
+#define HDMI_SRZ_CFG 0x504
+#define HDMI_SRZ_PWR_CFG 0x508
+#define HDMI_SRZ_PLL_CFG 0x510
+#define HDMI_SRZ_STR_1 0x518
+#define HDMI_SRZ_STR_2 0x51C
+#define HDMI_SRZ_CALCODE_EXT 0x530
+#define HDMI_SRZ_TX_RSVR_BITS 0x560
+
+/* ******************************* */
+/* register : HDMI_SRZ_CFG */
+/* ******************************* */
+#define HDMI_SRZ_CFG_EN BIT(0)
+#define HDMI_SRZ_CFG_EN_PE_C0_MASK GENMASK(6, 4)
+#define HDMI_SRZ_CFG_EN_PE_C1_MASK GENMASK(10, 8)
+#define HDMI_SRZ_CFG_EN_PE_C2_MASK GENMASK(14, 12)
+
+#define HDMI_SRZ_CFG_EXTERNAL_DATA BIT(16)
+#define HDMI_SRZ_CFG_RBIAS_EXT BIT(17)
+#define HDMI_SRZ_CFG_EN_SINK_TERM_DETECTION BIT(18)
+#define HDMI_SRZ_CFG_ISNKCTRL_MASK GENMASK(21, 20)
+
+#define HDMI_SRZ_CFG_EN_SRC_TERM_SHIFT (24)
+#define HDMI_SRZ_CFG_EN_SRC_TERM_VAL_0_165MHZ (0x0)
+#define HDMI_SRZ_CFG_EN_SRC_TERM_VAL_165_340MHZ (0x2)
+#define HDMI_SRZ_CFG_EN_SRC_TERM_VAL_ABV_340MHZ (0x3)
+
+#define HDMI_SRZ_CFG_CKCH_LOWSW_EN_SHIFT (29)
+#define HDMI_SRZ_CFG_CKCH_LOWSW_EN_VAL_500MV (0x0) /* for below or equal 3.4 Gbps */
+#define HDMI_SRZ_CFG_CKCH_LOWSW_EN_VAL_300MV (0x1) /* for above 3.4 Gbps */
+
+#define HDMI_SRZ_CFG_CKBY10_OR_40_SHIFT (30)
+#define HDMI_SRZ_CFG_CKBY10_OR_40_VAL_DIV_BY_10 (0x0) /* for below or equal 3.4 Gbps */
+#define HDMI_SRZ_CFG_CKBY10_OR_40_VAL_DIV_BY_40 (0x1) /* for above 3.4 Gbps */
+
+#define HDMI_SRZ_CFG_DATA20BIT10BIT_SHIFT (31)
+#define HDMI_SRZ_CFG_DATA20BIT10BIT_VAL_10_BPC (0x0)
+#define HDMI_SRZ_CFG_DATA20BIT10BIT_VAL_20_BPC (0x1)
+
+/* ******************************* */
+/* register : HDMI_SRZ_PLL_CFG */
+/* ******************************* */
+#define HDMI_PLL_CFG_EN BIT(0)
+#define HDMI_PLL_CFG_NDIV_SHIFT (8)
+#define HDMI_PLL_CFG_IDF_SHIFT (16)
+#define HDMI_PLL_CFG_ODF_SHIFT (24)
+
+#define ODF_DIV_1 (0)
+#define ODF_DIV_2 (1)
+#define ODF_DIV_4 (2)
+#define ODF_DIV_8 (3)
+#define ODF_DIV_16 (4)
+
+/* ******************************* */
+/* register : HDMI_SRZ_STR_1 */
+/* ******************************* */
+#define HDMI_SRZ_STR1_MSK_PEXC0 GENMASK(11, 0)
+#define HDMI_SRZ_STR1_MSK_PEXC1 GENMASK(27, 16)
+
+/* ******************************* */
+/* register : HDMI_SRZ_STR_2 */
+/* ******************************* */
+#define HDMI_SRZ_STR2_PEXC2 (0)
+#define HDMI_SRZ_STR2_MSK_PEXC2 (0xFFF << HDMI_SRZ_STR2_PEXC2)
+
+/* ******************************* */
+/* register : HDMI_SRZ_CALCODE_EXT */
+/* ******************************* */
+#define HDMI_SRZ_CALCODE_EXT_MASK GENMASK(27, 0)
+
+/* ******************************** */
+/* register : HDMI_SRZ_TX_RSVR_BITS */
+/* ******************************** */
+#define HDMI_SRZ_TX_RSVR_BITS_BELOW_340MHZ (0)
+#define HDMI_SRZ_TX_RSVR_BITS_ABOVE_340MHZ (0x0800000)
+
+/* *********************************** */
+/* Configuration */
+/* *********************************** */
+/* Config 0 => HDMI_SRZ_CFG */
+#define HDMI_SRZ_CONFIG_0_MASK (HDMI_SRZ_CFG_EN_PE_C0_MASK | \
+ HDMI_SRZ_CFG_EN_PE_C1_MASK | \
+ HDMI_SRZ_CFG_EN_PE_C2_MASK | \
+ HDMI_SRZ_CFG_ISNKCTRL_MASK)
+/* Config 1 => HDMI_SRZ_STR_1 */
+#define HDMI_SRZ_CONFIG_1_MASK (HDMI_SRZ_STR1_MSK_PEXC0 | HDMI_SRZ_STR1_MSK_PEXC1)
+
+/* Config 2 => HDMI_SRZ_STR_2 */
+#define HDMI_SRZ_CONFIG_2_MASK (HDMI_SRZ_STR2_MSK_PEXC2)
+
+/* Config 3 => HDMI_SRZ_CALCODE_EXT */
+#define HDMI_SRZ_CONFIG_3_MASK (HDMI_SRZ_CALCODE_EXT_MASK)
+
+#define STM_HDMI_THOLD_CLK_600MHZ (600000000)
+#define STM_HDMI_THOLD_CLK_340MHZ (340000000)
+#define STM_HDMI_THOLD_CLK_165MHZ (165000000)
+
+#define HDMI_TIMEOUT_PLL_LOCK 50 /*milliseconds */
+
+struct plldividers_s {
+ u32 min;
+ u32 max;
+ u32 idf;
+ u32 odf;
+};
+
+/*
+ * Functional specification recommended values
+ */
+static struct plldividers_s plldividers[] = {
+ {0, 37500000, 1, ODF_DIV_16 },
+ {37500000, 75000000, 2, ODF_DIV_8 },
+ {75000000, 150000000, 4, ODF_DIV_4 },
+ {150000000, 300000000, 8, ODF_DIV_2 },
+ {300000000, 600000000, 16, ODF_DIV_1 }
+};
+
+static struct hdmi_phy_config hdmiphy_config[] = {
+ {0, 145000000, {0x0, 0x0, 0x0, 0x0} },
+ {145000000, 165000000, {0x1110, 0x0, 0x0, 0x0} },
+ {165000000, 340000000, {0x1110, 0x30003, 0x3, 0x0} },
+ {340000000, 600000000, {0x200000, 0x0, 0x0, 0x0} },
+};
+
+/**
+ * sti_hdmi_tx6g0c28phy_start - Start hdmi phy macro cell tx6g0c28
+ *
+ * @hdmi: pointer on the hdmi internal structure
+ *
+ * Return false if an error occur
+ */
+static bool sti_hdmi_tx6g0c28phy_start(struct sti_hdmi *hdmi)
+{
+ u32 ckpxpll = hdmi->mode.clock * 1000;
+ u32 cfg, val, tmdsck, idf, odf, pllctrl = 0;
+ bool foundplldivides = false;
+ u32 tx_rsvr_bits = HDMI_SRZ_TX_RSVR_BITS_BELOW_340MHZ;
+ int i;
+
+ drm_dbg_driver(hdmi->drm_dev, "%s: ckpxpll = %dHz\n", __func__, ckpxpll);
+
+ for (i = 0; i < ARRAY_SIZE(plldividers); i++) {
+ if (ckpxpll >= plldividers[i].min &&
+ ckpxpll < plldividers[i].max) {
+ idf = plldividers[i].idf;
+ odf = plldividers[i].odf;
+ foundplldivides = true;
+ break;
+ }
+ }
+
+ if (!foundplldivides) {
+ dev_err(&hdmi->dev, "%s: input TMDS clock speed (%d) not supported\n",
+ __func__, ckpxpll);
+ return false;
+ }
+
+ /* Assuming no pixel repetition and 24bits color */
+ tmdsck = ckpxpll;
+ pllctrl |= 20 << HDMI_PLL_CFG_NDIV_SHIFT;
+
+ if (tmdsck > STM_HDMI_THOLD_CLK_600MHZ) {
+ dev_err(&hdmi->dev, "%s: output TMDS clock (%d) out of range\n", __func__, tmdsck);
+ return false;
+ }
+
+ pllctrl |= idf << HDMI_PLL_CFG_IDF_SHIFT;
+ pllctrl |= odf << HDMI_PLL_CFG_ODF_SHIFT;
+
+ cfg = (HDMI_SRZ_CFG_EN |
+ HDMI_SRZ_CFG_EXTERNAL_DATA |
+ HDMI_SRZ_CFG_RBIAS_EXT |
+ HDMI_SRZ_CFG_EN_SINK_TERM_DETECTION |
+ (HDMI_SRZ_CFG_DATA20BIT10BIT_VAL_10_BPC << HDMI_SRZ_CFG_DATA20BIT10BIT_SHIFT));
+
+ if (tmdsck > STM_HDMI_THOLD_CLK_340MHZ) {
+ cfg |= (HDMI_SRZ_CFG_EN_SRC_TERM_VAL_ABV_340MHZ << HDMI_SRZ_CFG_EN_SRC_TERM_SHIFT) |
+ (HDMI_SRZ_CFG_CKCH_LOWSW_EN_VAL_300MV << HDMI_SRZ_CFG_CKCH_LOWSW_EN_SHIFT) |
+ (HDMI_SRZ_CFG_CKBY10_OR_40_VAL_DIV_BY_40 << HDMI_SRZ_CFG_CKBY10_OR_40_SHIFT);
+ tx_rsvr_bits = HDMI_SRZ_TX_RSVR_BITS_ABOVE_340MHZ;
+ } else if (tmdsck > STM_HDMI_THOLD_CLK_165MHZ) {
+ cfg |= (HDMI_SRZ_CFG_EN_SRC_TERM_VAL_165_340MHZ << HDMI_SRZ_CFG_EN_SRC_TERM_SHIFT) |
+ (HDMI_SRZ_CFG_CKCH_LOWSW_EN_VAL_500MV << HDMI_SRZ_CFG_CKCH_LOWSW_EN_SHIFT) |
+ (HDMI_SRZ_CFG_CKBY10_OR_40_VAL_DIV_BY_10 << HDMI_SRZ_CFG_CKBY10_OR_40_SHIFT);
+ } else {
+ cfg |= (HDMI_SRZ_CFG_EN_SRC_TERM_VAL_0_165MHZ << HDMI_SRZ_CFG_EN_SRC_TERM_SHIFT) |
+ (HDMI_SRZ_CFG_CKCH_LOWSW_EN_VAL_500MV << HDMI_SRZ_CFG_CKCH_LOWSW_EN_SHIFT) |
+ (HDMI_SRZ_CFG_CKBY10_OR_40_VAL_DIV_BY_10 << HDMI_SRZ_CFG_CKBY10_OR_40_SHIFT);
+ }
+
+ /*
+ * To configure the source termination and pre-emphasis appropriately
+ * for different high speed TMDS clock frequencies a phy configuration
+ * table must be provided, tailored to the SoC and board combination.
+ */
+ for (i = 0; i < ARRAY_SIZE(hdmiphy_config); i++) {
+ if (hdmiphy_config[i].min_tmds_freq <= tmdsck &&
+ hdmiphy_config[i].max_tmds_freq >= tmdsck) {
+ cfg |= (hdmiphy_config[i].config[0] & HDMI_SRZ_CONFIG_0_MASK);
+ hdmi_write(hdmi, cfg, HDMI_SRZ_CFG);
+ hdmi_write(hdmi, 0, HDMI_SRZ_PWR_CFG);
+
+ val = hdmiphy_config[i].config[1] & HDMI_SRZ_CONFIG_1_MASK;
+ hdmi_write(hdmi, val, HDMI_SRZ_STR_1);
+
+ val = hdmiphy_config[i].config[2] & HDMI_SRZ_CONFIG_2_MASK;
+ hdmi_write(hdmi, val, HDMI_SRZ_STR_2);
+
+ val = hdmiphy_config[i].config[3] & HDMI_SRZ_CONFIG_3_MASK;
+ hdmi_write(hdmi, val, HDMI_SRZ_CALCODE_EXT);
+
+ hdmi_write(hdmi, tx_rsvr_bits, HDMI_SRZ_TX_RSVR_BITS);
+
+ /*
+ * Configure and power up the PHY PLL
+ */
+ hdmi->event_received = false;
+ hdmi_write(hdmi, (pllctrl | HDMI_PLL_CFG_EN), HDMI_SRZ_PLL_CFG);
+
+ /* wait PLL interrupt */
+ wait_event_interruptible_timeout(hdmi->wait_event, hdmi->event_received,
+ msecs_to_jiffies(HDMI_TIMEOUT_PLL_LOCK));
+
+ if ((hdmi_read(hdmi, HDMI_STA) & HDMI_STA_DLL_LCK) == 0) {
+ dev_err(&hdmi->dev, "%s: hdmi phy pll not locked\n", __func__);
+ return false;
+ }
+
+ /* Reset the HDMI_TX_PHY */
+ reset_control_assert(hdmi->reset);
+ usleep_range(15, 20);
+ reset_control_deassert(hdmi->reset);
+
+ return true;
+ }
+ }
+
+ /*
+ * Default, power up the serializer with no pre-emphasis or
+ * output swing correction
+ */
+ hdmi_write(hdmi, cfg, HDMI_SRZ_CFG);
+ hdmi_write(hdmi, 0, HDMI_SRZ_PWR_CFG);
+ hdmi_write(hdmi, 0, HDMI_SRZ_STR_1);
+ hdmi_write(hdmi, 0, HDMI_SRZ_STR_2);
+ hdmi_write(hdmi, 0, HDMI_SRZ_CALCODE_EXT);
+ hdmi_write(hdmi, 0, HDMI_SRZ_TX_RSVR_BITS);
+
+ return true;
+}
+
+/**
+ * sti_hdmi_tx6g0c28phy_stop - Stop hdmi phy macro cell tx6g0c28
+ *
+ * @hdmi: pointer on the hdmi internal structure
+ */
+static void sti_hdmi_tx6g0c28phy_stop(struct sti_hdmi *hdmi)
+{
+ hdmi->event_received = false;
+
+ hdmi_write(hdmi, HDMI_SRZ_CFG_EN_SINK_TERM_DETECTION, HDMI_SRZ_CFG);
+ hdmi_write(hdmi, 0, HDMI_SRZ_PLL_CFG);
+
+ /* wait PLL interrupt */
+ wait_event_interruptible_timeout(hdmi->wait_event,
+ hdmi->event_received,
+ msecs_to_jiffies
+ (HDMI_TIMEOUT_PLL_LOCK));
+
+ if (hdmi_read(hdmi, HDMI_STA) & HDMI_STA_DLL_LCK)
+ dev_err(&hdmi->dev, "%s: hdmi phy pll not well disabled\n", __func__);
+}
+
+struct hdmi_phy_ops tx6g0c28phy_ops = {
+ .start = sti_hdmi_tx6g0c28phy_start,
+ .stop = sti_hdmi_tx6g0c28phy_stop,
+};
diff --git a/drivers/gpu/drm/sti/sti_hdmi_tx6g0c28phy.h b/drivers/gpu/drm/sti/sti_hdmi_tx6g0c28phy.h
new file mode 100644
index 000000000000..bcb8b70d36ea
--- /dev/null
+++ b/drivers/gpu/drm/sti/sti_hdmi_tx6g0c28phy.h
@@ -0,0 +1,13 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Author: Alain Volmat <avolmat@...com>
+ */
+
+#ifndef _STI_HDMI_TX6G0C28PHY_H_
+#define _STI_HDMI_TX6G0C28PHY_H_
+
+#include "sti_hdmi.h"
+
+extern struct hdmi_phy_ops tx6g0c28phy_ops;
+
+#endif
--
2.34.1
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