diff options
Diffstat (limited to 'target/linux/brcm2708/patches-4.19/950-0547-drm-vc4-Add-support-for-multiple-displays-to-fkms.patch')
| -rw-r--r-- | target/linux/brcm2708/patches-4.19/950-0547-drm-vc4-Add-support-for-multiple-displays-to-fkms.patch | 280 |
1 files changed, 280 insertions, 0 deletions
diff --git a/target/linux/brcm2708/patches-4.19/950-0547-drm-vc4-Add-support-for-multiple-displays-to-fkms.patch b/target/linux/brcm2708/patches-4.19/950-0547-drm-vc4-Add-support-for-multiple-displays-to-fkms.patch new file mode 100644 index 0000000000..06f8cf4148 --- /dev/null +++ b/target/linux/brcm2708/patches-4.19/950-0547-drm-vc4-Add-support-for-multiple-displays-to-fkms.patch @@ -0,0 +1,280 @@ +From 4817db177a74ac58671e1fe84d98d584375d9697 Mon Sep 17 00:00:00 2001 +From: Dave Stevenson <dave.stevenson@raspberrypi.org> +Date: Wed, 3 Apr 2019 17:15:45 +0100 +Subject: [PATCH] drm: vc4: Add support for multiple displays to fkms + +There is a slightly nasty hack in that all crtcs share the +same SMI interrupt from the firmware. This seems to currently +work well enough, but ought to be fixed at a later date. + +Signed-off-by: Dave Stevenson <dave.stevenson@raspberrypi.org> +--- + drivers/gpu/drm/vc4/vc4_firmware_kms.c | 160 +++++++++++++++++-------- + 1 file changed, 113 insertions(+), 47 deletions(-) + +--- a/drivers/gpu/drm/vc4/vc4_firmware_kms.c ++++ b/drivers/gpu/drm/vc4/vc4_firmware_kms.c +@@ -29,6 +29,8 @@ + #include "vc_image_types.h" + #include <soc/bcm2835/raspberrypi-firmware.h> + ++#define PLANES_PER_CRTC 3 ++ + struct set_plane { + u8 display; + u8 plane_id; +@@ -175,6 +177,7 @@ struct vc4_crtc { + struct drm_pending_vblank_event *event; + u32 overscan[4]; + bool vblank_enabled; ++ u32 display_number; + }; + + static inline struct vc4_crtc *to_vc4_crtc(struct drm_crtc *crtc) +@@ -480,6 +483,7 @@ static const struct drm_plane_helper_fun + + static struct drm_plane *vc4_fkms_plane_init(struct drm_device *dev, + enum drm_plane_type type, ++ u8 display_num, + u8 plane_id) + { + struct drm_plane *plane = NULL; +@@ -543,7 +547,7 @@ static struct drm_plane *vc4_fkms_plane_ + vc4_plane->mb.tag.tag = RPI_FIRMWARE_SET_PLANE; + vc4_plane->mb.tag.buf_size = sizeof(struct set_plane); + vc4_plane->mb.tag.req_resp_size = 0; +- vc4_plane->mb.plane.display = 0; ++ vc4_plane->mb.plane.display = display_num; + vc4_plane->mb.plane.plane_id = plane_id; + vc4_plane->mb.plane.layer = default_zpos ? default_zpos : -127; + +@@ -630,16 +634,20 @@ static void vc4_crtc_handle_page_flip(st + + static irqreturn_t vc4_crtc_irq_handler(int irq, void *data) + { +- struct vc4_crtc *vc4_crtc = data; +- u32 stat = readl(vc4_crtc->regs + SMICS); ++ struct vc4_crtc **crtc_list = data; ++ int i; ++ u32 stat = readl(crtc_list[0]->regs + SMICS); + irqreturn_t ret = IRQ_NONE; + + if (stat & SMICS_INTERRUPTS) { +- writel(0, vc4_crtc->regs + SMICS); +- if (vc4_crtc->vblank_enabled) +- drm_crtc_handle_vblank(&vc4_crtc->base); +- vc4_crtc_handle_page_flip(vc4_crtc); +- ret = IRQ_HANDLED; ++ writel(0, crtc_list[0]->regs + SMICS); ++ ++ for (i = 0; crtc_list[i]; i++) { ++ if (crtc_list[i]->vblank_enabled) ++ drm_crtc_handle_vblank(&crtc_list[i]->base); ++ vc4_crtc_handle_page_flip(crtc_list[i]); ++ ret = IRQ_HANDLED; ++ } + } + + return ret; +@@ -836,66 +844,55 @@ static const struct drm_encoder_helper_f + .disable = vc4_fkms_encoder_disable, + }; + +-static int vc4_fkms_bind(struct device *dev, struct device *master, void *data) ++static int vc4_fkms_create_screen(struct device *dev, struct drm_device *drm, ++ int display_idx, int display_ref, ++ struct vc4_crtc **ret_crtc) + { +- struct platform_device *pdev = to_platform_device(dev); +- struct drm_device *drm = dev_get_drvdata(master); + struct vc4_dev *vc4 = to_vc4_dev(drm); + struct vc4_crtc *vc4_crtc; + struct vc4_fkms_encoder *vc4_encoder; + struct drm_crtc *crtc; + struct drm_plane *primary_plane, *overlay_plane, *cursor_plane; + struct drm_plane *destroy_plane, *temp; +- struct device_node *firmware_node; + u32 blank = 1; + int ret; + +- vc4->firmware_kms = true; +- +- /* firmware kms doesn't have precise a scanoutpos implementation, so +- * we can't do the precise vblank timestamp mode. +- */ +- drm->driver->get_scanout_position = NULL; +- drm->driver->get_vblank_timestamp = NULL; +- + vc4_crtc = devm_kzalloc(dev, sizeof(*vc4_crtc), GFP_KERNEL); + if (!vc4_crtc) + return -ENOMEM; + crtc = &vc4_crtc->base; + +- firmware_node = of_parse_phandle(dev->of_node, "brcm,firmware", 0); +- vc4->firmware = rpi_firmware_get(firmware_node); +- if (!vc4->firmware) { +- DRM_DEBUG("Failed to get Raspberry Pi firmware reference.\n"); +- return -EPROBE_DEFER; +- } +- of_node_put(firmware_node); +- +- /* Map the SMI interrupt reg */ +- vc4_crtc->regs = vc4_ioremap_regs(pdev, 0); +- if (IS_ERR(vc4_crtc->regs)) +- return PTR_ERR(vc4_crtc->regs); ++ vc4_crtc->display_number = display_ref; + + /* Blank the firmware provided framebuffer */ + rpi_firmware_property(vc4->firmware, + RPI_FIRMWARE_FRAMEBUFFER_BLANK, + &blank, sizeof(blank)); + +- primary_plane = vc4_fkms_plane_init(drm, DRM_PLANE_TYPE_PRIMARY, 0); ++ primary_plane = vc4_fkms_plane_init(drm, DRM_PLANE_TYPE_PRIMARY, ++ display_ref, ++ 0 + (display_idx * PLANES_PER_CRTC) ++ ); + if (IS_ERR(primary_plane)) { + dev_err(dev, "failed to construct primary plane\n"); + ret = PTR_ERR(primary_plane); + goto err; + } + +- overlay_plane = vc4_fkms_plane_init(drm, DRM_PLANE_TYPE_OVERLAY, 1); ++ overlay_plane = vc4_fkms_plane_init(drm, DRM_PLANE_TYPE_OVERLAY, ++ display_ref, ++ 1 + (display_idx * PLANES_PER_CRTC) ++ ); + if (IS_ERR(overlay_plane)) { + dev_err(dev, "failed to construct overlay plane\n"); + ret = PTR_ERR(overlay_plane); + goto err; + } + +- cursor_plane = vc4_fkms_plane_init(drm, DRM_PLANE_TYPE_CURSOR, 2); ++ cursor_plane = vc4_fkms_plane_init(drm, DRM_PLANE_TYPE_CURSOR, ++ display_ref, ++ 2 + (display_idx * PLANES_PER_CRTC) ++ ); + if (IS_ERR(cursor_plane)) { + dev_err(dev, "failed to construct cursor plane\n"); + ret = PTR_ERR(cursor_plane); +@@ -922,13 +919,6 @@ static int vc4_fkms_bind(struct device * + goto err_destroy_encoder; + } + +- writel(0, vc4_crtc->regs + SMICS); +- ret = devm_request_irq(dev, platform_get_irq(pdev, 0), +- vc4_crtc_irq_handler, 0, "vc4 firmware kms", +- vc4_crtc); +- if (ret) +- goto err_destroy_connector; +- + ret = rpi_firmware_property(vc4->firmware, + RPI_FIRMWARE_FRAMEBUFFER_GET_OVERSCAN, + &vc4_crtc->overscan, +@@ -938,7 +928,7 @@ static int vc4_fkms_bind(struct device * + memset(&vc4_crtc->overscan, 0, sizeof(vc4_crtc->overscan)); + } + +- platform_set_drvdata(pdev, vc4_crtc); ++ *ret_crtc = vc4_crtc; + + return 0; + +@@ -955,15 +945,91 @@ err: + return ret; + } + ++static int vc4_fkms_bind(struct device *dev, struct device *master, void *data) ++{ ++ struct platform_device *pdev = to_platform_device(dev); ++ struct drm_device *drm = dev_get_drvdata(master); ++ struct vc4_dev *vc4 = to_vc4_dev(drm); ++ struct device_node *firmware_node; ++ struct vc4_crtc **crtc_list; ++ u32 num_displays, display_num; ++ int ret; ++ const u32 display_num_lookup[] = {2, 7, 1}; ++ ++ vc4->firmware_kms = true; ++ ++ /* firmware kms doesn't have precise a scanoutpos implementation, so ++ * we can't do the precise vblank timestamp mode. ++ */ ++ drm->driver->get_scanout_position = NULL; ++ drm->driver->get_vblank_timestamp = NULL; ++ ++ firmware_node = of_parse_phandle(dev->of_node, "brcm,firmware", 0); ++ vc4->firmware = rpi_firmware_get(firmware_node); ++ if (!vc4->firmware) { ++ DRM_DEBUG("Failed to get Raspberry Pi firmware reference.\n"); ++ return -EPROBE_DEFER; ++ } ++ of_node_put(firmware_node); ++ ++ ret = rpi_firmware_property(vc4->firmware, ++ RPI_FIRMWARE_FRAMEBUFFER_GET_NUM_DISPLAYS, ++ &num_displays, sizeof(u32)); ++ ++ /* If we fail to get the number of displays, or it returns 0, then ++ * assume old firmware that doesn't have the mailbox call, so just ++ * set one display ++ */ ++ if (ret || num_displays == 0) { ++ num_displays = 1; ++ DRM_WARN("Unable to determine number of displays's. Assuming 1\n"); ++ ret = 0; ++ } ++ ++ /* Allocate a list, with space for a NULL on the end */ ++ crtc_list = devm_kzalloc(dev, sizeof(crtc_list) * (num_displays + 1), ++ GFP_KERNEL); ++ if (!crtc_list) ++ return -ENOMEM; ++ ++ for (display_num = 0; display_num < num_displays; display_num++) { ++ ret = vc4_fkms_create_screen(dev, drm, display_num, ++ display_num_lookup[display_num], ++ &crtc_list[display_num]); ++ if (ret) ++ DRM_ERROR("Oh dear, failed to create display %u\n", ++ display_num); ++ } ++ ++ /* Map the SMI interrupt reg */ ++ crtc_list[0]->regs = vc4_ioremap_regs(pdev, 0); ++ if (IS_ERR(crtc_list[0]->regs)) ++ DRM_ERROR("Oh dear, failed to map registers\n"); ++ ++ writel(0, crtc_list[0]->regs + SMICS); ++ ret = devm_request_irq(dev, platform_get_irq(pdev, 0), ++ vc4_crtc_irq_handler, 0, "vc4 firmware kms", ++ crtc_list); ++ if (ret) ++ DRM_ERROR("Oh dear, failed to register IRQ\n"); ++ ++ platform_set_drvdata(pdev, crtc_list); ++ ++ return 0; ++} ++ + static void vc4_fkms_unbind(struct device *dev, struct device *master, + void *data) + { + struct platform_device *pdev = to_platform_device(dev); +- struct vc4_crtc *vc4_crtc = dev_get_drvdata(dev); ++ struct vc4_crtc **crtc_list = dev_get_drvdata(dev); ++ int i; + +- vc4_fkms_connector_destroy(vc4_crtc->connector); +- vc4_fkms_encoder_destroy(vc4_crtc->encoder); +- drm_crtc_cleanup(&vc4_crtc->base); ++ for (i = 0; crtc_list[i]; i++) { ++ vc4_fkms_connector_destroy(crtc_list[i]->connector); ++ vc4_fkms_encoder_destroy(crtc_list[i]->encoder); ++ drm_crtc_cleanup(&crtc_list[i]->base); ++ } + + platform_set_drvdata(pdev, NULL); + } |