Re: [PATCH v5 drm-dp 5/5] drm/hisilicon/hibmc: add dp module in hibmc

Yongbang Shi <shiyongbang@xxxxxxxxxx> · Mon, 2 Dec 2024 19:13:54 +0800

On Mon, Nov 18, 2024 at 10:28:05PM +0800, Yongbang Shi wrote:
From: baihan li <libaihan@xxxxxxxxxx>

To support DP interface displaying in hibmc driver. Add
a encoder and connector for DP modual.

Signed-off-by: Baihan Li <libaihan@xxxxxxxxxx>
Signed-off-by: Yongbang Shi <shiyongbang@xxxxxxxxxx>
---
ChangeLog:
v3 -> v4:
   - static inline hibmc_dp_prepare(), suggested by Dmitry Baryshkov.
---
  drivers/gpu/drm/hisilicon/hibmc/Makefile      |   2 +-
  .../gpu/drm/hisilicon/hibmc/hibmc_drm_dp.c    | 118 ++++++++++++++++++
  .../gpu/drm/hisilicon/hibmc/hibmc_drm_drv.c   |  12 ++
  .../gpu/drm/hisilicon/hibmc/hibmc_drm_drv.h   |   5 +
  4 files changed, 136 insertions(+), 1 deletion(-)
  create mode 100644 drivers/gpu/drm/hisilicon/hibmc/hibmc_drm_dp.c

diff --git a/drivers/gpu/drm/hisilicon/hibmc/Makefile b/drivers/gpu/drm/hisilicon/hibmc/Makefile
index 214228052ccf..95a4ed599d98 100644
--- a/drivers/gpu/drm/hisilicon/hibmc/Makefile
+++ b/drivers/gpu/drm/hisilicon/hibmc/Makefile
@@ -1,5 +1,5 @@
  # SPDX-License-Identifier: GPL-2.0-only
  hibmc-drm-y := hibmc_drm_drv.o hibmc_drm_de.o hibmc_drm_vdac.o hibmc_drm_i2c.o \
-	       dp/dp_aux.o dp/dp_link.o dp/dp_hw.o
+	       dp/dp_aux.o dp/dp_link.o dp/dp_hw.o hibmc_drm_dp.o
  
  obj-$(CONFIG_DRM_HISI_HIBMC) += hibmc-drm.o
diff --git a/drivers/gpu/drm/hisilicon/hibmc/hibmc_drm_dp.c b/drivers/gpu/drm/hisilicon/hibmc/hibmc_drm_dp.c
new file mode 100644
index 000000000000..603d6b198a54
--- /dev/null
+++ b/drivers/gpu/drm/hisilicon/hibmc/hibmc_drm_dp.c
@@ -0,0 +1,118 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+// Copyright (c) 2024 Hisilicon Limited.
+
+#include <linux/io.h>
+
+#include <drm/drm_probe_helper.h>
+#include <drm/drm_simple_kms_helper.h>
+#include <drm/drm_atomic_helper.h>
+#include <drm/drm_modes.h>
+#include <drm/drm_drv.h>
+#include <drm/drm_edid.h>
+
+#include "hibmc_drm_drv.h"
+#include "dp/dp_hw.h"
+
+static int hibmc_dp_connector_get_modes(struct drm_connector *connector)
+{
+	int count;
+
+	count = drm_add_modes_noedid(connector, connector->dev->mode_config.max_width,
+				     connector->dev->mode_config.max_height);
+	drm_set_preferred_mode(connector, 1024, 768); // temporary implementation
Ideally this should be mentioned in the commit message.

+
+	return count;
+}
+
+static const struct drm_connector_helper_funcs hibmc_dp_conn_helper_funcs = {
+	.get_modes = hibmc_dp_connector_get_modes,
+};
+
+static const struct drm_connector_funcs hibmc_dp_conn_funcs = {
+	.reset = drm_atomic_helper_connector_reset,
+	.fill_modes = drm_helper_probe_single_connector_modes,
+	.destroy = drm_connector_cleanup,
+	.atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
+	.atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
No .detect / .detect_ctx ? No HPD support? Is it being targeted the DP
or eDP cases?

Hi Dmitry,
Thanks for your asking. Yes, I will add hpd and get edid functions in next patch,
and I will mention these in the commit message in v6.

Sincerely,
Baihan Li


+};
+
+static inline int hibmc_dp_prepare(struct hibmc_dp *dp, struct drm_display_mode *mode)
+{
+	int ret;
+
+	hibmc_dp_display_en(dp, false);
+
+	ret = hibmc_dp_mode_set(dp, mode);
+	if (ret)
+		drm_err(dp->drm_dev, "hibmc dp mode set failed: %d\n", ret);
+
+	return ret;
+}
+
+static void hibmc_dp_encoder_enable(struct drm_encoder *drm_encoder,
+				    struct drm_atomic_state *state)
+{
+	struct hibmc_dp *dp = container_of(drm_encoder, struct hibmc_dp, encoder);
+	struct drm_display_mode *mode = &drm_encoder->crtc->state->mode;
+
+	if (hibmc_dp_prepare(dp, mode))
+		return;
+
+	hibmc_dp_display_en(dp, true);
+}
+
+static void hibmc_dp_encoder_disable(struct drm_encoder *drm_encoder,
+				     struct drm_atomic_state *state)
+{
+	struct hibmc_dp *dp = container_of(drm_encoder, struct hibmc_dp, encoder);
+
+	hibmc_dp_display_en(dp, false);
+}
+
+static const struct drm_encoder_helper_funcs hibmc_dp_encoder_helper_funcs = {
+	.atomic_enable = hibmc_dp_encoder_enable,
+	.atomic_disable = hibmc_dp_encoder_disable,
+};
+
+int hibmc_dp_init(struct hibmc_drm_private *priv)
+{
+	struct drm_device *dev = &priv->dev;
+	struct drm_crtc *crtc = &priv->crtc;
+	struct hibmc_dp *dp = &priv->dp;
+	struct drm_connector *connector = &dp->connector;
+	struct drm_encoder *encoder = &dp->encoder;
+	int ret;
+
+	dp->mmio = priv->mmio;
+	dp->drm_dev = dev;
+
+	ret = hibmc_dp_hw_init(&priv->dp);
+	if (ret) {
+		drm_err(dev, "hibmc dp hw init failed: %d\n", ret);
+		return ret;
+	}
+
+	hibmc_dp_display_en(&priv->dp, false);
+
+	encoder->possible_crtcs = drm_crtc_mask(crtc);
+	ret = drmm_encoder_init(dev, encoder, NULL, DRM_MODE_ENCODER_TMDS, NULL);
+	if (ret) {
+		drm_err(dev, "init dp encoder failed: %d\n", ret);
+		return ret;
+	}
+
+	drm_encoder_helper_add(encoder, &hibmc_dp_encoder_helper_funcs);
+
+	ret = drm_connector_init(dev, connector, &hibmc_dp_conn_funcs,
+				 DRM_MODE_CONNECTOR_DisplayPort);
+	if (ret) {
+		drm_err(dev, "init dp connector failed: %d\n", ret);
+		return ret;
+	}
+
+	drm_connector_helper_add(connector, &hibmc_dp_conn_helper_funcs);
+
+	drm_connector_attach_encoder(connector, encoder);
+
+	return 0;
+}
diff --git a/drivers/gpu/drm/hisilicon/hibmc/hibmc_drm_drv.c b/drivers/gpu/drm/hisilicon/hibmc/hibmc_drm_drv.c
index 9f9b19ea0587..39fd8c5c8227 100644
--- a/drivers/gpu/drm/hisilicon/hibmc/hibmc_drm_drv.c
+++ b/drivers/gpu/drm/hisilicon/hibmc/hibmc_drm_drv.c
@@ -27,6 +27,10 @@
  #include "hibmc_drm_drv.h"
  #include "hibmc_drm_regs.h"
  
+#define HIBMC_DP_HOST_SERDES_CTRL		0x1f001c
+#define HIBMC_DP_HOST_SERDES_CTRL_VAL		0x8A00
+#define HIBMC_DP_HOST_SERDES_CTRL_MASK		0x7FFFF
+
  DEFINE_DRM_GEM_FOPS(hibmc_fops);
  
  static irqreturn_t hibmc_interrupt(int irq, void *arg)
@@ -116,6 +120,14 @@ static int hibmc_kms_init(struct hibmc_drm_private *priv)
  		return ret;
  	}
  
+	/* if DP existed, init DP */
+	if ((readl(priv->mmio + HIBMC_DP_HOST_SERDES_CTRL) &
+	     HIBMC_DP_HOST_SERDES_CTRL_MASK) == HIBMC_DP_HOST_SERDES_CTRL_VAL) {
+		ret = hibmc_dp_init(priv);
+		if (ret)
+			drm_err(dev, "failed to init dp: %d\n", ret);
+	}
+
  	ret = hibmc_vdac_init(priv);
  	if (ret) {
  		drm_err(dev, "failed to init vdac: %d\n", ret);
diff --git a/drivers/gpu/drm/hisilicon/hibmc/hibmc_drm_drv.h b/drivers/gpu/drm/hisilicon/hibmc/hibmc_drm_drv.h
index 42f0ab8f9b5a..d982f1e4b958 100644
--- a/drivers/gpu/drm/hisilicon/hibmc/hibmc_drm_drv.h
+++ b/drivers/gpu/drm/hisilicon/hibmc/hibmc_drm_drv.h
@@ -20,6 +20,8 @@
  
  #include <drm/drm_framebuffer.h>
  
+#include "dp/dp_hw.h"
+
  struct hibmc_vdac {
  	struct drm_device *dev;
  	struct drm_encoder encoder;
@@ -37,6 +39,7 @@ struct hibmc_drm_private {
  	struct drm_plane primary_plane;
  	struct drm_crtc crtc;
  	struct hibmc_vdac vdac;
+	struct hibmc_dp dp;
  };
  
  static inline struct hibmc_vdac *to_hibmc_vdac(struct drm_connector *connector)
@@ -59,4 +62,6 @@ int hibmc_vdac_init(struct hibmc_drm_private *priv);
  
  int hibmc_ddc_create(struct drm_device *drm_dev, struct hibmc_vdac *connector);
  
+int hibmc_dp_init(struct hibmc_drm_private *priv);
+
  #endif
--
2.33.0







