diff options
Diffstat (limited to 'meta-agl-bsp/meta-raspberrypi/recipes-kernel/linux/linux-raspberrypi/dsi/0002-drm-vc4-Make-DSI-call-into-the-bridge-after-the-DSI-.patch')
| -rw-r--r-- | meta-agl-bsp/meta-raspberrypi/recipes-kernel/linux/linux-raspberrypi/dsi/0002-drm-vc4-Make-DSI-call-into-the-bridge-after-the-DSI-.patch | 102 |
1 files changed, 102 insertions, 0 deletions
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 index 000000000..13d821418 --- /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 + |