[PATCH 3/5] drm/msm/dsi: Add a mdp4 encoder for DSI
Archit Taneja
architt at codeaurora.org
Wed Nov 18 05:10:47 PST 2015
From: Vinay Simha BN <vinaysimha at inforcecomputing.com>
Create an mdp4 incoder for DSI. Only DSI video mode is supported as of
now.
Signed-off-by: Archit Taneja <architt at codeaurora.org>
Signed-off-by: Vinay Simha BN <vinaysimha at inforcecomputing.com>
---
drivers/gpu/drm/msm/Makefile | 1 +
drivers/gpu/drm/msm/mdp/mdp4/mdp4_dsi_encoder.c | 198 ++++++++++++++++++++++++
drivers/gpu/drm/msm/mdp/mdp4/mdp4_kms.h | 9 ++
3 files changed, 208 insertions(+)
create mode 100644 drivers/gpu/drm/msm/mdp/mdp4/mdp4_dsi_encoder.c
diff --git a/drivers/gpu/drm/msm/Makefile b/drivers/gpu/drm/msm/Makefile
index 156a93d..065ad41 100644
--- a/drivers/gpu/drm/msm/Makefile
+++ b/drivers/gpu/drm/msm/Makefile
@@ -54,6 +54,7 @@ msm-$(CONFIG_DRM_FBDEV_EMULATION) += msm_fbdev.o
msm-$(CONFIG_COMMON_CLK) += mdp/mdp4/mdp4_lvds_pll.o
msm-$(CONFIG_DRM_MSM_DSI) += dsi/dsi.o \
+ mdp/mdp4/mdp4_dsi_encoder.o \
dsi/dsi_cfg.o \
dsi/dsi_host.o \
dsi/dsi_manager.o \
diff --git a/drivers/gpu/drm/msm/mdp/mdp4/mdp4_dsi_encoder.c b/drivers/gpu/drm/msm/mdp/mdp4/mdp4_dsi_encoder.c
new file mode 100644
index 0000000..49052bb
--- /dev/null
+++ b/drivers/gpu/drm/msm/mdp/mdp4/mdp4_dsi_encoder.c
@@ -0,0 +1,198 @@
+/*
+ * Copyright (c) 2015, The Linux Foundation. All rights reserved.
+ * Copyright (c) 2014, Inforce Computing. All rights reserved.
+ *
+ * Author: Vinay Simha <vinaysimha at inforcecomputing.com>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License 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.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "mdp4_kms.h"
+
+#include "drm_crtc.h"
+#include "drm_crtc_helper.h"
+
+struct mdp4_dsi_encoder {
+ struct drm_encoder base;
+ struct drm_panel *panel;
+ bool enabled;
+};
+#define to_mdp4_dsi_encoder(x) container_of(x, struct mdp4_dsi_encoder, base)
+
+static struct mdp4_kms *get_kms(struct drm_encoder *encoder)
+{
+ struct msm_drm_private *priv = encoder->dev->dev_private;
+ return to_mdp4_kms(to_mdp_kms(priv->kms));
+}
+
+static void mdp4_dsi_encoder_destroy(struct drm_encoder *encoder)
+{
+ struct mdp4_dsi_encoder *mdp4_dsi_encoder = to_mdp4_dsi_encoder(encoder);
+
+ drm_encoder_cleanup(encoder);
+ kfree(mdp4_dsi_encoder);
+}
+
+static const struct drm_encoder_funcs mdp4_dsi_encoder_funcs = {
+ .destroy = mdp4_dsi_encoder_destroy,
+};
+
+static bool mdp4_dsi_encoder_mode_fixup(struct drm_encoder *encoder,
+ const struct drm_display_mode *mode,
+ struct drm_display_mode *adjusted_mode)
+{
+ return true;
+}
+
+static void mdp4_dsi_encoder_mode_set(struct drm_encoder *encoder,
+ struct drm_display_mode *mode,
+ struct drm_display_mode *adjusted_mode)
+{
+ struct mdp4_kms *mdp4_kms = get_kms(encoder);
+ uint32_t dsi_hsync_skew, vsync_period, vsync_len, ctrl_pol;
+ uint32_t display_v_start, display_v_end;
+ uint32_t hsync_start_x, hsync_end_x;
+
+ mode = adjusted_mode;
+
+ DBG("set mode: %d:\"%s\" %d %d %d %d %d %d %d %d %d %d 0x%x 0x%x",
+ mode->base.id, mode->name,
+ mode->vrefresh, mode->clock,
+ mode->hdisplay, mode->hsync_start,
+ mode->hsync_end, mode->htotal,
+ mode->vdisplay, mode->vsync_start,
+ mode->vsync_end, mode->vtotal,
+ mode->type, mode->flags);
+
+ ctrl_pol = 0;
+ if (mode->flags & DRM_MODE_FLAG_NHSYNC)
+ ctrl_pol |= MDP4_DSI_CTRL_POLARITY_HSYNC_LOW;
+ if (mode->flags & DRM_MODE_FLAG_NVSYNC)
+ ctrl_pol |= MDP4_DSI_CTRL_POLARITY_VSYNC_LOW;
+ /* probably need to get DATA_EN polarity from panel.. */
+
+ dsi_hsync_skew = 0; /* get this from panel? */
+
+ hsync_start_x = (mode->htotal - mode->hsync_start);
+ hsync_end_x = mode->htotal - (mode->hsync_start - mode->hdisplay) - 1;
+
+ vsync_period = mode->vtotal * mode->htotal;
+ vsync_len = (mode->vsync_end - mode->vsync_start) * mode->htotal;
+ display_v_start = (mode->vtotal - mode->vsync_start) * mode->htotal + dsi_hsync_skew;
+ display_v_end = vsync_period - ((mode->vsync_start - mode->vdisplay) * mode->htotal) + dsi_hsync_skew - 1;
+
+ mdp4_write(mdp4_kms, REG_MDP4_DSI_HSYNC_CTRL,
+ MDP4_DSI_HSYNC_CTRL_PULSEW(mode->hsync_end - mode->hsync_start) |
+ MDP4_DSI_HSYNC_CTRL_PERIOD(mode->htotal));
+ mdp4_write(mdp4_kms, REG_MDP4_DSI_VSYNC_PERIOD, vsync_period);
+ mdp4_write(mdp4_kms, REG_MDP4_DSI_VSYNC_LEN, vsync_len);
+ mdp4_write(mdp4_kms, REG_MDP4_DSI_DISPLAY_HCTRL,
+ MDP4_DSI_DISPLAY_HCTRL_START(hsync_start_x) |
+ MDP4_DSI_DISPLAY_HCTRL_END(hsync_end_x));
+ mdp4_write(mdp4_kms, REG_MDP4_DSI_DISPLAY_VSTART, display_v_start);
+ mdp4_write(mdp4_kms, REG_MDP4_DSI_DISPLAY_VEND, display_v_end);
+
+ mdp4_write(mdp4_kms, REG_MDP4_DSI_CTRL_POLARITY, ctrl_pol);
+ mdp4_write(mdp4_kms, REG_MDP4_DSI_UNDERFLOW_CLR,
+ MDP4_DSI_UNDERFLOW_CLR_ENABLE_RECOVERY |
+ MDP4_DSI_UNDERFLOW_CLR_COLOR(0xff));
+ mdp4_write(mdp4_kms, REG_MDP4_DSI_ACTIVE_HCTL,
+ MDP4_DSI_ACTIVE_HCTL_START(0) |
+ MDP4_DSI_ACTIVE_HCTL_END(0));
+ mdp4_write(mdp4_kms, REG_MDP4_DSI_HSYNC_SKEW, dsi_hsync_skew);
+ mdp4_write(mdp4_kms, REG_MDP4_DSI_BORDER_CLR, 0);
+ mdp4_write(mdp4_kms, REG_MDP4_DSI_ACTIVE_VSTART, 0);
+ mdp4_write(mdp4_kms, REG_MDP4_DSI_ACTIVE_VEND, 0);
+}
+
+static void mdp4_dsi_encoder_disable(struct drm_encoder *encoder)
+{
+ struct mdp4_dsi_encoder *mdp4_dsi_encoder = to_mdp4_dsi_encoder(encoder);
+ struct mdp4_kms *mdp4_kms = get_kms(encoder);
+
+ if (!mdp4_dsi_encoder->enabled)
+ return;
+
+ mdp4_write(mdp4_kms, REG_MDP4_DSI_ENABLE, 0);
+
+ /*
+ * Wait for a vsync so we know the ENABLE=0 latched before
+ * the (connector) source of the vsync's gets disabled,
+ * otherwise we end up in a funny state if we re-enable
+ * before the disable latches, which results that some of
+ * the settings changes for the new modeset (like new
+ * scanout buffer) don't latch properly..
+ */
+ mdp_irq_wait(&mdp4_kms->base, MDP4_IRQ_PRIMARY_VSYNC);
+
+ mdp4_dsi_encoder->enabled = false;
+}
+
+static void mdp4_dsi_encoder_enable(struct drm_encoder *encoder)
+{
+ struct mdp4_dsi_encoder *mdp4_dsi_encoder = to_mdp4_dsi_encoder(encoder);
+ struct mdp4_kms *mdp4_kms = get_kms(encoder);
+
+ if (mdp4_dsi_encoder->enabled)
+ return;
+
+ mdp4_crtc_set_config(encoder->crtc,
+ MDP4_DMA_CONFIG_PACK_ALIGN_MSB |
+ MDP4_DMA_CONFIG_DEFLKR_EN |
+ MDP4_DMA_CONFIG_DITHER_EN |
+ MDP4_DMA_CONFIG_R_BPC(BPC8) |
+ MDP4_DMA_CONFIG_G_BPC(BPC8) |
+ MDP4_DMA_CONFIG_B_BPC(BPC8) |
+ MDP4_DMA_CONFIG_PACK(0x21));
+
+ mdp4_crtc_set_intf(encoder->crtc, INTF_DSI_VIDEO, 0);
+
+ mdp4_write(mdp4_kms, REG_MDP4_DSI_ENABLE, 1);
+
+ mdp4_dsi_encoder->enabled = true;
+}
+
+static const struct drm_encoder_helper_funcs mdp4_dsi_encoder_helper_funcs = {
+ .mode_fixup = mdp4_dsi_encoder_mode_fixup,
+ .mode_set = mdp4_dsi_encoder_mode_set,
+ .disable = mdp4_dsi_encoder_disable,
+ .enable = mdp4_dsi_encoder_enable,
+};
+
+/* initialize encoder */
+struct drm_encoder *mdp4_dsi_encoder_init(struct drm_device *dev)
+{
+ struct drm_encoder *encoder = NULL;
+ struct mdp4_dsi_encoder *mdp4_dsi_encoder;
+ int ret;
+
+ mdp4_dsi_encoder = kzalloc(sizeof(*mdp4_dsi_encoder), GFP_KERNEL);
+ if (!mdp4_dsi_encoder) {
+ ret = -ENOMEM;
+ goto fail;
+ }
+
+ encoder = &mdp4_dsi_encoder->base;
+
+ drm_encoder_init(dev, encoder, &mdp4_dsi_encoder_funcs,
+ DRM_MODE_ENCODER_DSI);
+ drm_encoder_helper_add(encoder, &mdp4_dsi_encoder_helper_funcs);
+
+ return encoder;
+
+fail:
+ if (encoder)
+ mdp4_dsi_encoder_destroy(encoder);
+
+ return ERR_PTR(ret);
+}
diff --git a/drivers/gpu/drm/msm/mdp/mdp4/mdp4_kms.h b/drivers/gpu/drm/msm/mdp/mdp4/mdp4_kms.h
index 7d03585..f3bb808 100644
--- a/drivers/gpu/drm/msm/mdp/mdp4/mdp4_kms.h
+++ b/drivers/gpu/drm/msm/mdp/mdp4/mdp4_kms.h
@@ -217,6 +217,15 @@ struct drm_encoder *mdp4_lcdc_encoder_init(struct drm_device *dev,
struct drm_connector *mdp4_lvds_connector_init(struct drm_device *dev,
struct device_node *panel_node, struct drm_encoder *encoder);
+#ifdef CONFIG_DRM_MSM_DSI
+struct drm_encoder *mdp4_dsi_encoder_init(struct drm_device *dev);
+#else
+static inline struct drm_encoder *mdp4_dsi_encoder_init(struct drm_device *dev)
+{
+ return ERR_PTR(-ENODEV);
+}
+#endif
+
#ifdef CONFIG_COMMON_CLK
struct clk *mpd4_lvds_pll_init(struct drm_device *dev);
#else
--
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