| Message ID | 20220419100405.12600-2-tzimmermann@suse.de (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | of: Register platform device for each framebuffer | expand |
On Tue, Apr 19, 2022 at 12:04:04PM +0200, Thomas Zimmermann wrote: > Create a platform device for each OF-declared framebuffer and have > offb bind to these devices. Allows for real hot-unplugging and other > drivers besides offb. > > Originally, offb created framebuffer devices while initializing its > module by parsing the OF device tree. No actual Linux device was set > up. This tied OF framebuffers to offb and makes writing other drivers > for the OF framebuffers complicated. The absence of a Linux device > further prevented real hot-unplugging. Adding a distinct platform > device for each OF framebuffer solves both problems. Specifically, a > DRM driver can now provide graphics output for modern userspace. > > Some of the offb init code is now located in the OF initialization. > There's now also an implementation of of_platform_default_populate_init(), > which was missing before. The OF side creates different devices for > either OF display nodes or BootX displays as they require different > handling by the driver. The offb drivers picks up each type of device > and runs the appropriate fbdev initialization. > > Tested with OF display nodes on qemu's ppc64le target. > > v2: > * run PPC code as part of existing initialization (Rob) > * add a few more error warnings (Javier) > > Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de> > Reviewed-by: Javier Martinez Canillas <javierm@redhat.com> > --- > drivers/of/platform.c | 88 ++++++++++++++++++++++++++-------- > drivers/video/fbdev/offb.c | 98 +++++++++++++++++++++++++------------- > 2 files changed, 132 insertions(+), 54 deletions(-) > > diff --git a/drivers/of/platform.c b/drivers/of/platform.c > index a16b74f32aa9..738ba2e2838c 100644 > --- a/drivers/of/platform.c > +++ b/drivers/of/platform.c > @@ -507,7 +507,6 @@ int of_platform_default_populate(struct device_node *root, > } > EXPORT_SYMBOL_GPL(of_platform_default_populate); > > -#ifndef CONFIG_PPC > static const struct of_device_id reserved_mem_matches[] = { > { .compatible = "qcom,rmtfs-mem" }, > { .compatible = "qcom,cmd-db" }, > @@ -520,33 +519,81 @@ static const struct of_device_id reserved_mem_matches[] = { > > static int __init of_platform_default_populate_init(void) > { > - struct device_node *node; > - As both if/else clauses need 'node', I'd keep this declared here. > device_links_supplier_sync_state_pause(); > > if (!of_have_populated_dt()) > return -ENODEV; > > - /* > - * Handle certain compatibles explicitly, since we don't want to create > - * platform_devices for every node in /reserved-memory with a > - * "compatible", > - */ > - for_each_matching_node(node, reserved_mem_matches) > - of_platform_device_create(node, NULL, NULL); > + if (IS_ENABLED(CONFIG_PPC)) { > + struct device_node *boot_display = NULL; > + struct device_node *node; > + struct platform_device *dev; > + int ret; > + > + /* Check if we have a MacOS display without a node spec */ > + if (of_get_property(of_chosen, "linux,bootx-noscreen", NULL)) { > + /* > + * The old code tried to work out which node was the MacOS > + * display based on the address. I'm dropping that since the > + * lack of a node spec only happens with old BootX versions > + * (users can update) and with this code, they'll still get > + * a display (just not the palette hacks). > + */ > + dev = platform_device_alloc("bootx-noscreen", 0); > + if (WARN_ON(!dev)) > + return -ENOMEM; > + ret = platform_device_add(dev); > + if (WARN_ON(ret)) { > + platform_device_put(dev); > + return ret; > + } > + } > > - node = of_find_node_by_path("/firmware"); > - if (node) { > - of_platform_populate(node, NULL, NULL, NULL); > - of_node_put(node); > - } > + /* > + * For OF framebuffers, first create the device for the boot display, > + * then for the other framebuffers. Only fail for the boot display; > + * ignore errors for the rest. > + */ > + for_each_node_by_type(node, "display") { > + if (!of_get_property(node, "linux,opened", NULL) || > + !of_get_property(node, "linux,boot-display", NULL)) > + continue; > + dev = of_platform_device_create(node, "of-display", NULL); > + if (WARN_ON(!dev)) > + return -ENOMEM; > + boot_display = node; > + break; > + } > + for_each_node_by_type(node, "display") { > + if (!of_get_property(node, "linux,opened", NULL) || node == boot_display) > + continue; > + of_platform_device_create(node, "of-display", NULL); > + } > > - node = of_get_compatible_child(of_chosen, "simple-framebuffer"); > - of_platform_device_create(node, NULL, NULL); > - of_node_put(node); > + } else { > + struct device_node *node; > + > + /* > + * Handle certain compatibles explicitly, since we don't want to create > + * platform_devices for every node in /reserved-memory with a > + * "compatible", > + */ > + for_each_matching_node(node, reserved_mem_matches) > + of_platform_device_create(node, NULL, NULL); > > - /* Populate everything else. */ > - of_platform_default_populate(NULL, NULL, NULL); > + node = of_find_node_by_path("/firmware"); > + if (node) { > + of_platform_populate(node, NULL, NULL, NULL); > + of_node_put(node); > + } > + > + node = of_get_compatible_child(of_chosen, "simple-framebuffer"); > + of_platform_device_create(node, NULL, NULL); > + of_node_put(node); In v1, you supported "simple-framebuffer" on PPC. Don't we want to allow that? Maybe no one cares ATM, but that could change. Either way: Reviewed-by: Rob Herring <robh@kernel.org> > + > + /* Populate everything else. */ > + of_platform_default_populate(NULL, NULL, NULL); > + } > > return 0; > } > @@ -558,7 +605,6 @@ static int __init of_platform_sync_state_init(void) > return 0; > } > late_initcall_sync(of_platform_sync_state_init); > -#endif > > int of_platform_device_destroy(struct device *dev, void *data) > {
Hi Am 19.04.22 um 15:30 schrieb Rob Herring: ... >> -#ifndef CONFIG_PPC >> static const struct of_device_id reserved_mem_matches[] = { >> { .compatible = "qcom,rmtfs-mem" }, >> { .compatible = "qcom,cmd-db" }, >> @@ -520,33 +519,81 @@ static const struct of_device_id reserved_mem_matches[] = { >> >> static int __init of_platform_default_populate_init(void) >> { >> - struct device_node *node; >> - > > As both if/else clauses need 'node', I'd keep this declared here. Ok. > >> device_links_supplier_sync_state_pause(); >> >> if (!of_have_populated_dt()) >> return -ENODEV; >> >> - /* >> - * Handle certain compatibles explicitly, since we don't want to create >> - * platform_devices for every node in /reserved-memory with a >> - * "compatible", >> - */ >> - for_each_matching_node(node, reserved_mem_matches) >> - of_platform_device_create(node, NULL, NULL); >> + if (IS_ENABLED(CONFIG_PPC)) { >> + struct device_node *boot_display = NULL; >> + struct device_node *node; >> + struct platform_device *dev; >> + int ret; >> + >> + /* Check if we have a MacOS display without a node spec */ >> + if (of_get_property(of_chosen, "linux,bootx-noscreen", NULL)) { >> + /* >> + * The old code tried to work out which node was the MacOS >> + * display based on the address. I'm dropping that since the >> + * lack of a node spec only happens with old BootX versions >> + * (users can update) and with this code, they'll still get >> + * a display (just not the palette hacks). >> + */ >> + dev = platform_device_alloc("bootx-noscreen", 0); >> + if (WARN_ON(!dev)) >> + return -ENOMEM; >> + ret = platform_device_add(dev); >> + if (WARN_ON(ret)) { >> + platform_device_put(dev); >> + return ret; >> + } >> + } >> >> - node = of_find_node_by_path("/firmware"); >> - if (node) { >> - of_platform_populate(node, NULL, NULL, NULL); >> - of_node_put(node); >> - } >> + /* >> + * For OF framebuffers, first create the device for the boot display, >> + * then for the other framebuffers. Only fail for the boot display; >> + * ignore errors for the rest. >> + */ >> + for_each_node_by_type(node, "display") { >> + if (!of_get_property(node, "linux,opened", NULL) || >> + !of_get_property(node, "linux,boot-display", NULL)) >> + continue; >> + dev = of_platform_device_create(node, "of-display", NULL); >> + if (WARN_ON(!dev)) >> + return -ENOMEM; >> + boot_display = node; >> + break; >> + } >> + for_each_node_by_type(node, "display") { >> + if (!of_get_property(node, "linux,opened", NULL) || node == boot_display) >> + continue; >> + of_platform_device_create(node, "of-display", NULL); >> + } >> >> - node = of_get_compatible_child(of_chosen, "simple-framebuffer"); >> - of_platform_device_create(node, NULL, NULL); >> - of_node_put(node); >> + } else { >> + struct device_node *node; >> + >> + /* >> + * Handle certain compatibles explicitly, since we don't want to create >> + * platform_devices for every node in /reserved-memory with a >> + * "compatible", >> + */ >> + for_each_matching_node(node, reserved_mem_matches) >> + of_platform_device_create(node, NULL, NULL); >> >> - /* Populate everything else. */ >> - of_platform_default_populate(NULL, NULL, NULL); >> + node = of_find_node_by_path("/firmware"); >> + if (node) { >> + of_platform_populate(node, NULL, NULL, NULL); >> + of_node_put(node); >> + } >> + >> + node = of_get_compatible_child(of_chosen, "simple-framebuffer"); >> + of_platform_device_create(node, NULL, NULL); >> + of_node_put(node); > > In v1, you supported "simple-framebuffer" on PPC. Don't we want to allow > that? Maybe no one cares ATM, but that could change. Either way: Support for these framebuffers has always been mutually exclusive. The offb driver, which originally contained the code, depends on CONFIG_PPC. And PPC never supported simple-framebuffer anywhere. > > Reviewed-by: Rob Herring <robh@kernel.org> Thank you. Best regards Thomas > > >> + >> + /* Populate everything else. */ >> + of_platform_default_populate(NULL, NULL, NULL); >> + } >> >> return 0; >> } >> @@ -558,7 +605,6 @@ static int __init of_platform_sync_state_init(void) >> return 0; >> } >> late_initcall_sync(of_platform_sync_state_init); >> -#endif >> >> int of_platform_device_destroy(struct device *dev, void *data) >> {
diff --git a/drivers/of/platform.c b/drivers/of/platform.c index a16b74f32aa9..738ba2e2838c 100644 --- a/drivers/of/platform.c +++ b/drivers/of/platform.c @@ -507,7 +507,6 @@ int of_platform_default_populate(struct device_node *root, } EXPORT_SYMBOL_GPL(of_platform_default_populate); -#ifndef CONFIG_PPC static const struct of_device_id reserved_mem_matches[] = { { .compatible = "qcom,rmtfs-mem" }, { .compatible = "qcom,cmd-db" }, @@ -520,33 +519,81 @@ static const struct of_device_id reserved_mem_matches[] = { static int __init of_platform_default_populate_init(void) { - struct device_node *node; - device_links_supplier_sync_state_pause(); if (!of_have_populated_dt()) return -ENODEV; - /* - * Handle certain compatibles explicitly, since we don't want to create - * platform_devices for every node in /reserved-memory with a - * "compatible", - */ - for_each_matching_node(node, reserved_mem_matches) - of_platform_device_create(node, NULL, NULL); + if (IS_ENABLED(CONFIG_PPC)) { + struct device_node *boot_display = NULL; + struct device_node *node; + struct platform_device *dev; + int ret; + + /* Check if we have a MacOS display without a node spec */ + if (of_get_property(of_chosen, "linux,bootx-noscreen", NULL)) { + /* + * The old code tried to work out which node was the MacOS + * display based on the address. I'm dropping that since the + * lack of a node spec only happens with old BootX versions + * (users can update) and with this code, they'll still get + * a display (just not the palette hacks). + */ + dev = platform_device_alloc("bootx-noscreen", 0); + if (WARN_ON(!dev)) + return -ENOMEM; + ret = platform_device_add(dev); + if (WARN_ON(ret)) { + platform_device_put(dev); + return ret; + } + } - node = of_find_node_by_path("/firmware"); - if (node) { - of_platform_populate(node, NULL, NULL, NULL); - of_node_put(node); - } + /* + * For OF framebuffers, first create the device for the boot display, + * then for the other framebuffers. Only fail for the boot display; + * ignore errors for the rest. + */ + for_each_node_by_type(node, "display") { + if (!of_get_property(node, "linux,opened", NULL) || + !of_get_property(node, "linux,boot-display", NULL)) + continue; + dev = of_platform_device_create(node, "of-display", NULL); + if (WARN_ON(!dev)) + return -ENOMEM; + boot_display = node; + break; + } + for_each_node_by_type(node, "display") { + if (!of_get_property(node, "linux,opened", NULL) || node == boot_display) + continue; + of_platform_device_create(node, "of-display", NULL); + } - node = of_get_compatible_child(of_chosen, "simple-framebuffer"); - of_platform_device_create(node, NULL, NULL); - of_node_put(node); + } else { + struct device_node *node; + + /* + * Handle certain compatibles explicitly, since we don't want to create + * platform_devices for every node in /reserved-memory with a + * "compatible", + */ + for_each_matching_node(node, reserved_mem_matches) + of_platform_device_create(node, NULL, NULL); - /* Populate everything else. */ - of_platform_default_populate(NULL, NULL, NULL); + node = of_find_node_by_path("/firmware"); + if (node) { + of_platform_populate(node, NULL, NULL, NULL); + of_node_put(node); + } + + node = of_get_compatible_child(of_chosen, "simple-framebuffer"); + of_platform_device_create(node, NULL, NULL); + of_node_put(node); + + /* Populate everything else. */ + of_platform_default_populate(NULL, NULL, NULL); + } return 0; } @@ -558,7 +605,6 @@ static int __init of_platform_sync_state_init(void) return 0; } late_initcall_sync(of_platform_sync_state_init); -#endif int of_platform_device_destroy(struct device *dev, void *data) { diff --git a/drivers/video/fbdev/offb.c b/drivers/video/fbdev/offb.c index afdb6aa48add..b1acb1ebebe9 100644 --- a/drivers/video/fbdev/offb.c +++ b/drivers/video/fbdev/offb.c @@ -386,10 +386,10 @@ static void offb_init_palette_hacks(struct fb_info *info, struct device_node *dp FB_VISUAL_PSEUDOCOLOR : FB_VISUAL_STATIC_PSEUDOCOLOR; } -static void __init offb_init_fb(const char *name, - int width, int height, int depth, - int pitch, unsigned long address, - int foreign_endian, struct device_node *dp) +static void offb_init_fb(struct platform_device *parent, const char *name, + int width, int height, int depth, + int pitch, unsigned long address, + int foreign_endian, struct device_node *dp) { unsigned long res_size = pitch * height; struct offb_par *par = &default_par; @@ -410,12 +410,13 @@ static void __init offb_init_fb(const char *name, return; } - info = framebuffer_alloc(sizeof(u32) * 16, NULL); + info = framebuffer_alloc(sizeof(u32) * 16, &parent->dev); if (!info) { release_mem_region(res_start, res_size); return; } + platform_set_drvdata(parent, info); fix = &info->fix; var = &info->var; @@ -535,7 +536,8 @@ static void __init offb_init_fb(const char *name, } -static void __init offb_init_nodriver(struct device_node *dp, int no_real_node) +static void offb_init_nodriver(struct platform_device *parent, struct device_node *dp, + int no_real_node) { unsigned int len; int i, width = 640, height = 480, depth = 8, pitch = 640; @@ -650,46 +652,76 @@ static void __init offb_init_nodriver(struct device_node *dp, int no_real_node) /* kludge for valkyrie */ if (of_node_name_eq(dp, "valkyrie")) address += 0x1000; - offb_init_fb(no_real_node ? "bootx" : NULL, + offb_init_fb(parent, no_real_node ? "bootx" : NULL, width, height, depth, pitch, address, foreign_endian, no_real_node ? NULL : dp); } } -static int __init offb_init(void) +static int offb_remove(struct platform_device *pdev) { - struct device_node *dp = NULL, *boot_disp = NULL; + struct fb_info *info = platform_get_drvdata(pdev); - if (fb_get_options("offb", NULL)) - return -ENODEV; + if (info) + unregister_framebuffer(info); - /* Check if we have a MacOS display without a node spec */ - if (of_get_property(of_chosen, "linux,bootx-noscreen", NULL) != NULL) { - /* The old code tried to work out which node was the MacOS - * display based on the address. I'm dropping that since the - * lack of a node spec only happens with old BootX versions - * (users can update) and with this code, they'll still get - * a display (just not the palette hacks). - */ - offb_init_nodriver(of_chosen, 1); - } + return 0; +} - for_each_node_by_type(dp, "display") { - if (of_get_property(dp, "linux,opened", NULL) && - of_get_property(dp, "linux,boot-display", NULL)) { - boot_disp = dp; - offb_init_nodriver(dp, 0); - } - } - for_each_node_by_type(dp, "display") { - if (of_get_property(dp, "linux,opened", NULL) && - dp != boot_disp) - offb_init_nodriver(dp, 0); - } +static int offb_probe_bootx_noscreen(struct platform_device *pdev) +{ + offb_init_nodriver(pdev, of_chosen, 1); return 0; } +static struct platform_driver offb_driver_bootx_noscreen = { + .driver = { + .name = "bootx-noscreen", + }, + .probe = offb_probe_bootx_noscreen, + .remove = offb_remove, +}; + +static int offb_probe_display(struct platform_device *pdev) +{ + offb_init_nodriver(pdev, pdev->dev.of_node, 0); + + return 0; +} +static const struct of_device_id offb_of_match_display[] = { + { .compatible = "display", }, + { }, +}; +MODULE_DEVICE_TABLE(of, offb_of_match_display); + +static struct platform_driver offb_driver_display = { + .driver = { + .name = "of-display", + .of_match_table = offb_of_match_display, + }, + .probe = offb_probe_display, + .remove = offb_remove, +}; + +static int __init offb_init(void) +{ + if (fb_get_options("offb", NULL)) + return -ENODEV; + + platform_driver_register(&offb_driver_bootx_noscreen); + platform_driver_register(&offb_driver_display); + + return 0; +} module_init(offb_init); + +static void __exit offb_exit(void) +{ + platform_driver_unregister(&offb_driver_display); + platform_driver_unregister(&offb_driver_bootx_noscreen); +} +module_exit(offb_exit); + MODULE_LICENSE("GPL");