Fix rpi touchscreen support on master

[AGL/meta-agl.git] / meta-agl-bsp / meta-raspberrypi / recipes-kernel / linux / linux-raspberrypi / dsi / 0002-drm-vc4-Make-DSI-call-into-the-bridge-after-the-DSI-.patch

diff --git a/meta-agl-bsp/meta-raspberrypi/recipes-kernel/linux/linux-raspberrypi/dsi/0002-drm-vc4-Make-DSI-call-into-the-bridge-after-the-DSI-.patch b/meta-agl-bsp/meta-raspberrypi/recipes-kernel/linux/linux-raspberrypi/dsi/0002-drm-vc4-Make-DSI-call-into-the-bridge-after-the-DSI-.patch
new file mode 100644 (file)
index 0000000..13d8214
--- /dev/null
+++ b/meta-agl-bsp/meta-raspberrypi/recipes-kernel/linux/linux-raspberrypi/dsi/0002-drm-vc4-Make-DSI-call-into-the-bridge-after-the-DSI-.patch
@@ -0,0 +1,102 @@
+From ab06860f2361a3750ec3a62347e0fdd7873cb30d Mon Sep 17 00:00:00 2001
+From: Kevin Quigley <kevin@kquigley.co.uk>
+Date: Mon, 24 Sep 2018 18:07:40 +0000
+Subject: [PATCH 2/4] drm/vc4: Make DSI call into the bridge after the DSI link
+ is enabled. bring this patch https://patchwork.kernel.org/patch/10480937/ to
+ Linux rpi-4.14.y
+
+This allows panels or bridges that need to send DSI commands during
+pre_enable() to successfully send them.  We delay DISP0 (aka the
+actual display) enabling until after pre_enable so that pixels aren't
+streaming before then.
+
+v2: Just clear out the encoder->bridge value to disable the midlayer
+    calls (idea by Andrzej Hajda).
+---
+ drivers/gpu/drm/vc4/vc4_dsi.c | 48 ++++++++++++++++++++++++-----------
+ 1 file changed, 33 insertions(+), 15 deletions(-)
+
+diff --git a/drivers/gpu/drm/vc4/vc4_dsi.c b/drivers/gpu/drm/vc4/vc4_dsi.c
+index a3f416cbd1d6..3fa2db18d70f 100644
+--- a/drivers/gpu/drm/vc4/vc4_dsi.c
++++ b/drivers/gpu/drm/vc4/vc4_dsi.c
+@@ -814,7 +814,9 @@ static void vc4_dsi_encoder_disable(struct drm_encoder *encoder)
+       struct vc4_dsi *dsi = vc4_encoder->dsi;
+       struct device *dev = &dsi->pdev->dev;
+ 
++      drm_bridge_disable(dsi->bridge);
+       vc4_dsi_ulps(dsi, true);
++      drm_bridge_post_disable(dsi->bridge);
+ 
+       clk_disable_unprepare(dsi->pll_phy_clock);
+       clk_disable_unprepare(dsi->escape_clock);
+@@ -1089,21 +1091,6 @@ static void vc4_dsi_encoder_enable(struct drm_encoder *encoder)
+       /* Display reset sequence timeout */
+       DSI_PORT_WRITE(PR_TO_CNT, 100000);
+ 
+-      if (dsi->mode_flags & MIPI_DSI_MODE_VIDEO) {
+-              DSI_PORT_WRITE(DISP0_CTRL,
+-                             VC4_SET_FIELD(dsi->divider,
+-                                           DSI_DISP0_PIX_CLK_DIV) |
+-                             VC4_SET_FIELD(dsi->format, DSI_DISP0_PFORMAT) |
+-                             VC4_SET_FIELD(DSI_DISP0_LP_STOP_PERFRAME,
+-                                           DSI_DISP0_LP_STOP_CTRL) |
+-                             DSI_DISP0_ST_END |
+-                             DSI_DISP0_ENABLE);
+-      } else {
+-              DSI_PORT_WRITE(DISP0_CTRL,
+-                             DSI_DISP0_COMMAND_MODE |
+-                             DSI_DISP0_ENABLE);
+-      }
+-
+       /* Set up DISP1 for transferring long command payloads through
+        * the pixfifo.
+        */
+@@ -1128,6 +1115,25 @@ static void vc4_dsi_encoder_enable(struct drm_encoder *encoder)
+ 
+       vc4_dsi_ulps(dsi, false);
+ 
++      drm_bridge_pre_enable(dsi->bridge);
++
++      if (dsi->mode_flags & MIPI_DSI_MODE_VIDEO) {
++              DSI_PORT_WRITE(DISP0_CTRL,
++                             VC4_SET_FIELD(dsi->divider,
++                                           DSI_DISP0_PIX_CLK_DIV) |
++                             VC4_SET_FIELD(dsi->format, DSI_DISP0_PFORMAT) |
++                             VC4_SET_FIELD(DSI_DISP0_LP_STOP_PERFRAME,
++                                           DSI_DISP0_LP_STOP_CTRL) |
++                             DSI_DISP0_ST_END |
++                             DSI_DISP0_ENABLE);
++      } else {
++              DSI_PORT_WRITE(DISP0_CTRL,
++                             DSI_DISP0_COMMAND_MODE |
++                             DSI_DISP0_ENABLE);
++      }
++
++      drm_bridge_enable(dsi->bridge);
++
+       if (debug_dump_regs) {
+               DRM_INFO("DSI regs after:\n");
+               vc4_dsi_dump_regs(dsi);
+@@ -1656,6 +1662,18 @@ static int vc4_dsi_bind(struct device *dev, struct device *master, void *data)
+ 
+       dev_set_drvdata(dev, dsi);
+ 
++      ret = drm_bridge_attach(dsi->encoder, dsi->bridge, NULL);
++      if (ret) {
++              dev_err(dev, "bridge attach failed: %d\n", ret);
++              return ret;
++      }
++      /* Disable the atomic helper calls into the bridge.  We
++       * manually call the bridge pre_enable / enable / etc. calls
++       * from our driver, since we need to sequence them within the
++       * encoder's enable/disable paths.
++       */
++      dsi->encoder->bridge = NULL;
++
+       pm_runtime_enable(dev);
+ 
+       return 0;
+-- 
+2.21.0
+