dri-devel February 2020

dri-devel@lists.freedesktop.org

302 participants
679 discussions

[PATCH v2] drm: panfrost: Silence warnings during deferred probe
by Marek Szyprowski 02 Mar '20

02 Mar '20

Signed-off-by: Marek Szyprowski <m.szyprowski(a)samsung.com> --- v2: - fixed build warning --- drivers/gpu/drm/panfrost/panfrost_device.c | 26 +++++++++++++++------- 1 file changed, 18 insertions(+), 8 deletions(-) diff --git a/drivers/gpu/drm/panfrost/panfrost_device.c b/drivers/gpu/drm/panfrost/panfrost_device.c index 238fb6d54df4..2c4ada3041b1 100644 --- a/drivers/gpu/drm/panfrost/panfrost_device.c +++ b/drivers/gpu/drm/panfrost/panfrost_device.c @@ -21,7 +21,9 @@ static int panfrost_reset_init(struct panfrost_device *pfdev) pfdev->rstc = devm_reset_control_array_get(pfdev->dev, false, true); if (IS_ERR(pfdev->rstc)) { - dev_err(pfdev->dev, "get reset failed %ld\n", PTR_ERR(pfdev->rstc)); + if (PTR_ERR(pfdev->rstc) != -EPROBE_DEFER) + dev_err(pfdev->dev, "get reset failed %ld\n", + PTR_ERR(pfdev->rstc)); return PTR_ERR(pfdev->rstc); } @@ -44,7 +46,9 @@ static int panfrost_clk_init(struct panfrost_device *pfdev) pfdev->clock = devm_clk_get(pfdev->dev, NULL); if (IS_ERR(pfdev->clock)) { - dev_err(pfdev->dev, "get clock failed %ld\n", PTR_ERR(pfdev->clock)); + if (PTR_ERR(pfdev->clock) != -EPROBE_DEFER) + dev_err(pfdev->dev, "get clock failed %ld\n", + PTR_ERR(pfdev->clock)); return PTR_ERR(pfdev->clock); } @@ -57,8 +61,9 @@ static int panfrost_clk_init(struct panfrost_device *pfdev) pfdev->bus_clock = devm_clk_get_optional(pfdev->dev, "bus"); if (IS_ERR(pfdev->bus_clock)) { - dev_err(pfdev->dev, "get bus_clock failed %ld\n", - PTR_ERR(pfdev->bus_clock)); + if (PTR_ERR(pfdev->bus_clock) != -EPROBE_DEFER) + dev_err(pfdev->dev, "get bus_clock failed %ld\n", + PTR_ERR(pfdev->bus_clock)); return PTR_ERR(pfdev->bus_clock); } @@ -92,7 +97,9 @@ static int panfrost_regulator_init(struct panfrost_device *pfdev) pfdev->regulator = devm_regulator_get(pfdev->dev, "mali"); if (IS_ERR(pfdev->regulator)) { ret = PTR_ERR(pfdev->regulator); - dev_err(pfdev->dev, "failed to get regulator: %d\n", ret); + if (ret != -EPROBE_DEFER) + dev_err(pfdev->dev, "failed to get regulator: %d\n", + ret); return ret; } @@ -124,19 +131,22 @@ int panfrost_device_init(struct panfrost_device *pfdev) err = panfrost_clk_init(pfdev); if (err) { - dev_err(pfdev->dev, "clk init failed %d\n", err); + if (err != -EPROBE_DEFER) + dev_err(pfdev->dev, "clk init failed %d\n", err); return err; } err = panfrost_regulator_init(pfdev); if (err) { - dev_err(pfdev->dev, "regulator init failed %d\n", err); + if (err != -EPROBE_DEFER) + dev_err(pfdev->dev, "regulator init failed %d\n", err); goto err_out0; } err = panfrost_reset_init(pfdev); if (err) { - dev_err(pfdev->dev, "reset init failed %d\n", err); + if (err != -EPROBE_DEFER) + dev_err(pfdev->dev, "reset init failed %d\n", err); goto err_out1; } -- 2.17.1

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[PATCH RFT v2 0/3] devfreq fixes for panfrost
by Martin Blumenstingl 02 Mar '20

02 Mar '20

These are a bunch of devfreq fixes for panfrost that came up in a discussion with Robin Murphy during the code-review of the lima devfreq patches: [0] I am only able to test patch #1 properly because the only boards with panfrost GPU that I have are using an Amlogic SoC. We don't have support for the OPP tables or dynamic clock changes there yet. So patches #2 and #3 are compile-tested only. Changes since v1 at [1] - added Steven's Reviewed-by to patch #2 (thank you!) - only use dev_pm_opp_put_regulators() to clean up in panfrost_devfreq_init() if regulators_opp_table is not NULL to fix a potential crash inside dev_pm_opp_put_regulators() as spotted by Steven Price (thank you!). While here, I also switched to "goto err" pattern to avoid lines with more than 80 characters. Known discussion topics (I have no way to test either of these, so I am looking for help here): - Steven Price reported the following message on his firefly (RK3288) board: "debugfs: Directory 'ffa30000.gpu-mali' with parent 'vdd_gpu' already present!" - Robin Murphy suggested that patch #1 may not work once the OPP table for the GPU comes from SCMI [0] https://patchwork.freedesktop.org/patch/346898/ [1] https://patchwork.freedesktop.org/series/71744/ Martin Blumenstingl (3): drm/panfrost: enable devfreq based the "operating-points-v2" property drm/panfrost: call dev_pm_opp_of_remove_table() in all error-paths drm/panfrost: Use the mali-supply regulator for control again drivers/gpu/drm/panfrost/panfrost_devfreq.c | 44 +++++++++++++++++---- drivers/gpu/drm/panfrost/panfrost_device.h | 1 + 2 files changed, 37 insertions(+), 8 deletions(-) -- 2.24.1

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[PATCH v2 0/2] drm/amd/display: dc_link: cleaning up some code style issues
by Melissa Wen 02 Mar '20

02 Mar '20

This patchset solves some coding style issues on dc_link for readability and cleaning up warnings. Change suggested by checkpatch.pl. Changes in v2: - Apply patches to the right amdgpu repository. - Remove unnecessary {} added in the previous version. Melissa Wen (2): drm/amd/display: dc_link: code clean up on enable_link_dp function drm/amd/display: dc_link: code clean up on detect_dp function drivers/gpu/drm/amd/display/dc/core/dc_link.c | 64 +++++++++---------- 1 file changed, 30 insertions(+), 34 deletions(-) -- 2.25.0

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[PATCH 1/2] drm/vmwgfx: Drop preempt_disable() in vmw_fifo_ping_host()
by Sebastian Andrzej Siewior 02 Mar '20

02 Mar '20

vmw_fifo_ping_host() disables preemption around a test and a register write via vmw_write(). The write function acquires a spinlock_t typed lock which is not allowed in a preempt_disable()ed section on PREEMPT_RT. This has been reported in the bugzilla. It has been explained by Thomas Hellstrom that this preempt_disable()ed section is not required for correctness. Remove the preempt_disable() section. Link: https://bugzilla.kernel.org/show_bug.cgi?id=206591 Link: https://lkml.kernel.org/r/0b5e1c65d89951de993deab06d1d197b40fd67aa.camel@vm… Signed-off-by: Sebastian Andrzej Siewior <bigeasy(a)linutronix.de> --- drivers/gpu/drm/vmwgfx/vmwgfx_fifo.c | 2 -- 1 file changed, 2 deletions(-) diff --git a/drivers/gpu/drm/vmwgfx/vmwgfx_fifo.c b/drivers/gpu/drm/vmwgfx/vmwgfx_fifo.c index e5252ef3812f0..6941689085ed3 100644 --- a/drivers/gpu/drm/vmwgfx/vmwgfx_fifo.c +++ b/drivers/gpu/drm/vmwgfx/vmwgfx_fifo.c @@ -169,10 +169,8 @@ void vmw_fifo_ping_host(struct vmw_private *dev_priv, uint32_t reason) { u32 *fifo_mem = dev_priv->mmio_virt; - preempt_disable(); if (cmpxchg(fifo_mem + SVGA_FIFO_BUSY, 0, 1) == 0) vmw_write(dev_priv, SVGA_REG_SYNC, reason); - preempt_enable(); } void vmw_fifo_release(struct vmw_private *dev_priv, struct vmw_fifo_state *fifo) -- 2.25.1

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[PATCH] Update arm,smmu.yaml bindings doc
by Sharat Masetty 02 Mar '20

02 Mar '20

Patch [1] adds a "mem_iface_clock" in the clocks list for smmu device. This patch updates the yaml doc file for smmu by adding the definition for this new clock. 1: https://patchwork.freedesktop.org/patch/352718/ Sharat Masetty (1): dt-bindings: arm-smmu: update clocks and bindings for sc7180 SoC Documentation/devicetree/bindings/iommu/arm,smmu.yaml | 3 +++ 1 file changed, 3 insertions(+) -- 1.9.1

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[PATCH v5 0/3] drm/virtio: fix mmap page attributes
by Gerd Hoffmann 02 Mar '20

02 Mar '20

v5: rebase, add tags, add cc stable for 1+2, no code changes. v4: back to v2-ish design, but simplified a bit. v3: switch to drm_gem_object_funcs callback. v2: make shmem helper caching configurable. Gerd Hoffmann (3): drm/shmem: add support for per object caching flags. drm/virtio: fix mmap page attributes drm/udl: simplify gem object mapping. include/drm/drm_gem_shmem_helper.h | 5 ++ drivers/gpu/drm/drm_gem_shmem_helper.c | 15 ++++-- drivers/gpu/drm/udl/udl_gem.c | 62 ++----------------------- drivers/gpu/drm/virtio/virtgpu_object.c | 1 + 4 files changed, 20 insertions(+), 63 deletions(-) -- 2.18.2

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BUG: unable to handle kernel paging request in ion_heap_clear_pages
by syzbot 01 Mar '20

01 Mar '20

Hello, syzbot found the following crash on: HEAD commit: 419593da Add linux-next specific files for 20191129 git tree: linux-next console output: https://syzkaller.appspot.com/x/log.txt?x=12bfd882e00000 kernel config: https://syzkaller.appspot.com/x/.config?x=7c04b0959e75c206 dashboard link: https://syzkaller.appspot.com/bug?extid=be6ccf3081ce8afd1b56 compiler: gcc (GCC) 9.0.0 20181231 (experimental) Unfortunately, I don't have any reproducer for this crash yet. IMPORTANT: if you fix the bug, please add the following tag to the commit: Reported-by: syzbot+be6ccf3081ce8afd1b56(a)syzkaller.appspotmail.com BUG: unable to handle page fault for address: fffff52002e00000 #PF: supervisor read access in kernel mode #PF: error_code(0x0000) - not-present page PGD 21ffee067 P4D 21ffee067 PUD aa11c067 PMD 0 Oops: 0000 [#1] PREEMPT SMP KASAN CPU: 0 PID: 3644 Comm: ion_system_heap Not tainted 5.4.0-next-20191129-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:memory_is_nonzero mm/kasan/generic.c:121 [inline] RIP: 0010:memory_is_poisoned_n mm/kasan/generic.c:135 [inline] RIP: 0010:memory_is_poisoned mm/kasan/generic.c:166 [inline] RIP: 0010:check_memory_region_inline mm/kasan/generic.c:182 [inline] RIP: 0010:check_memory_region+0x9c/0x1a0 mm/kasan/generic.c:192 Code: c9 4d 0f 49 c1 49 c1 f8 03 45 85 c0 0f 84 10 01 00 00 41 83 e8 01 4e 8d 44 c0 08 eb 0d 48 83 c0 08 4c 39 c0 0f 84 a7 00 00 00 <48> 83 38 00 74 ed 4c 8d 40 08 eb 09 48 83 c0 01 49 39 c0 74 53 80 RSP: 0018:ffffc9000c9f7ab8 EFLAGS: 00010212 RAX: fffff52002e00000 RBX: fffff52002e01600 RCX: ffffffff85d5c229 RDX: 0000000000000001 RSI: 000000000000b000 RDI: ffffc90017000000 RBP: ffffc9000c9f7ad0 R08: fffff52002e01600 R09: 0000000000001600 R10: fffff52002e015ff R11: ffffc9001700afff R12: fffff52002e00000 R13: 000000000000b000 R14: 0000000000000000 R15: ffffc9000c9f7d08 FS: 0000000000000000(0000) GS:ffff8880ae600000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: fffff52002e00000 CR3: 00000000778bd000 CR4: 00000000001406f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: memset+0x24/0x40 mm/kasan/common.c:107 memset include/linux/string.h:410 [inline] ion_heap_clear_pages+0x49/0x70 drivers/staging/android/ion/ion_heap.c:106 ion_heap_sglist_zero+0x245/0x270 drivers/staging/android/ion/ion_heap.c:130 ion_heap_buffer_zero+0xf5/0x150 drivers/staging/android/ion/ion_heap.c:145 ion_system_heap_free+0x1eb/0x250 drivers/staging/android/ion/ion_system_heap.c:163 ion_buffer_destroy+0x159/0x2d0 drivers/staging/android/ion/ion.c:93 ion_heap_deferred_free+0x29d/0x630 drivers/staging/android/ion/ion_heap.c:239 kthread+0x361/0x430 kernel/kthread.c:255 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352 Modules linked in: CR2: fffff52002e00000 ---[ end trace ee5c63907f1d6f00 ]--- RIP: 0010:memory_is_nonzero mm/kasan/generic.c:121 [inline] RIP: 0010:memory_is_poisoned_n mm/kasan/generic.c:135 [inline] RIP: 0010:memory_is_poisoned mm/kasan/generic.c:166 [inline] RIP: 0010:check_memory_region_inline mm/kasan/generic.c:182 [inline] RIP: 0010:check_memory_region+0x9c/0x1a0 mm/kasan/generic.c:192 Code: c9 4d 0f 49 c1 49 c1 f8 03 45 85 c0 0f 84 10 01 00 00 41 83 e8 01 4e 8d 44 c0 08 eb 0d 48 83 c0 08 4c 39 c0 0f 84 a7 00 00 00 <48> 83 38 00 74 ed 4c 8d 40 08 eb 09 48 83 c0 01 49 39 c0 74 53 80 RSP: 0018:ffffc9000c9f7ab8 EFLAGS: 00010212 RAX: fffff52002e00000 RBX: fffff52002e01600 RCX: ffffffff85d5c229 RDX: 0000000000000001 RSI: 000000000000b000 RDI: ffffc90017000000 RBP: ffffc9000c9f7ad0 R08: fffff52002e01600 R09: 0000000000001600 R10: fffff52002e015ff R11: ffffc9001700afff R12: fffff52002e00000 R13: 000000000000b000 R14: 0000000000000000 R15: ffffc9000c9f7d08 FS: 0000000000000000(0000) GS:ffff8880ae600000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: fffff52002e00000 CR3: 00000000778bd000 CR4: 00000000001406f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 --- This bug is generated by a bot. It may contain errors. See https://goo.gl/tpsmEJ for more information about syzbot. syzbot engineers can be reached at syzkaller(a)googlegroups.com. syzbot will keep track of this bug report. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot.

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[Bug 206393] New: amdgpu: garbled screen after resume
by bugzilla-daemon＠bugzilla.kernel.org 01 Mar '20

01 Mar '20

https://bugzilla.kernel.org/show_bug.cgi?id=206393 Bug ID: 206393 Summary: amdgpu: garbled screen after resume Product: Drivers Version: 2.5 Kernel Version: 5.5.1-arch1, 5.5-arch1 Hardware: All OS: Linux Tree: Mainline Status: NEW Severity: normal Priority: P1 Component: Video(DRI - non Intel) Assignee: drivers_video-dri(a)kernel-bugs.osdl.org Reporter: bjo(a)nord-west.org Regression: No Created attachment 287081 --> https://bugzilla.kernel.org/attachment.cgi?id=287081&action=edit garbled screen On a Thinkpad A275 with a Radeon R5/R6/R7 (verbose lspci attached) the screen is garbled after resume. First a black screen appears and then more and more white pixels appear from the border to the middle of the screen. Restarting the X-session via SSH does not help, the VTs are also inaccessible. -- You are receiving this mail because: You are watching the assignee of the bug.

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[PATCH 0/8] Huge page-table entries for TTM
by Thomas Hellström (VMware) 01 Mar '20

01 Mar '20

In order to save TLB space and CPU usage this patchset enables huge- and giant page-table entries for TTM and TTM-enabled graphics drivers. Patch 1 introduces a vma_is_special_huge() function to make the mm code take the same path as DAX when splitting huge- and giant page table entries, (which currently is zapping the page-table entry and rely on re-faulting). Patch 2 makes the mm code split existing huge page-table entries on huge_fault fallbacks. Typically on COW or on buffer-objects that want write-notify. COW and write-notification is always done on the lowest page-table level. See the patch log message for additional considerations. Patch 3 introduces functions to allow the graphics drivers to manipulate the caching- and encryption flags of huge page-table entries without ugly hacks. Patch 4 implements the huge_fault handler in TTM. This enables huge page-table entries, provided that the kernel is configured to support transhuge pages, either by default or using madvise(). However, they are unlikely to be inserted unless the kernel buffer object pfns and user-space addresses align perfectly. There are various options here, but since buffer objects that reside in system pages typically start at huge page boundaries if they are backed by huge pages, we try to enforce buffer object starting pfns and user-space addresses to be huge page-size aligned if their size exceeds a huge page-size. If pud-size transhuge ("giant") pages are enabled by the arch, the same holds for those. Patch 5 implements a specialized huge_fault handler for vmwgfx. The vmwgfx driver may perform dirty-tracking and needs some special code to handle that correctly. Patch 6 implements a drm helper to align user-space addresses according to the above scheme, if possible. Patch 7 implements a TTM range manager that does the same for graphics IO memory. Patch 8 finally hooks up the helpers of patch 6 and 7 to the vmwgfx driver. A similar change is needed for graphics drivers that want a reasonable likelyhood of actually using huge page-table entries. Finally, if a buffer object size is not huge-page or giant-page aligned, its size will NOT be inflated by this patchset. This means that the buffer object tail will use smaller size page-table entries and thus no memory overhead occurs. Drivers that want to pay the memory overhead price need to implement their own scheme to inflate buffer-object sizes. PMD size huge page-table-entries have been tested with vmwgfx and found to work well both with system memory backed and IO memory backed buffer objects. PUD size giant page-table-entries have seen limited (fault and COW) testing using a modified kernel and a fake vmwgfx TTM memory type. The vmwgfx driver does otherwise not support 1GB-size IO memory resources. Comments and suggestions welcome. Thomas Changes since RFC: * Check for buffer objects present in contigous IO Memory (Christian König) * Rebased on the vmwgfx emulated coherent memory functionality. That rebase adds patch 5. Cc: Andrew Morton <akpm(a)linux-foundation.org> Cc: Michal Hocko <mhocko(a)suse.com> Cc: "Matthew Wilcox (Oracle)" <willy(a)infradead.org> Cc: "Kirill A. Shutemov" <kirill.shutemov(a)linux.intel.com> Cc: Ralph Campbell <rcampbell(a)nvidia.com> Cc: "Jérôme Glisse" <jglisse(a)redhat.com> Cc: "Christian König" <christian.koenig(a)amd.com>

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[RFC 0/9] Regmap over USB for Multifunction USB Device (gpio, display, ...)
by Noralf Trønnes 29 Feb '20

29 Feb '20

Hi, A while back I had the idea to turn a Raspberry Pi Zero into a $5 USB to HDMI/SDTV/DSI/DPI display adapter. Thinking about how to represent the display to the driver I realised that hardware use registers as API. And Linux does have a generic register abstraction: regmap. Furthermore this means that if I can do a regmap over USB implementation, it will be easy to do other functions like gpio, adc and others. After a few iterations trying to understand the USB subsystem and satisfying driver requirements, I now have something that looks promising. I'm sending out an early version hoping to get feedback especially on the core parts that handles regmap and interrupts. Overview: USB Host : USB Device : -------------- : ------------------ ---------- | mfd: mud | : | f_mud | ---------- | Driver | -------------- : | | | Driver | ---------- | regmap-usb | : | (mud_regmap) | ---------- -------------- : ------------------ I've attached 2 drivers: - gpio/pinctrl: is more or less finished - display: needs a lot more work USB3 device I've only tested this with usb2 devices (Pi, BBB) so I should get myself a usb3 gadget capable board. My searching didn't turn up much, so this seems to be quite rare. ROCK960 has USB 3.0 type C OTG but the price is $139 which is a bit expensive for this hobby project. Does anyone know of a cheap board? Noralf. Noralf Trønnes (9): regmap: Add USB support mfd: Add driver for Multifunction USB Device usb: gadget: function: Add Multifunction USB Device support pinctrl: Add Multifunction USB Device pinctrl driver usb: gadget: function: mud: Add gpio support regmap: Speed up _regmap_raw_write_impl() for large buffers drm: Add Multifunction USB Device display driver drm/client: Add drm_client_init_from_id() and drm_client_modeset_set() usb: gadget: function: mud: Add display support drivers/base/regmap/Kconfig | 8 +- drivers/base/regmap/Makefile | 1 + drivers/base/regmap/regmap-usb.c | 1026 ++++++++++++++++++ drivers/base/regmap/regmap.c | 10 +- drivers/gpu/drm/Kconfig | 2 + drivers/gpu/drm/Makefile | 1 + drivers/gpu/drm/drm_client.c | 37 + drivers/gpu/drm/drm_client_modeset.c | 52 + drivers/gpu/drm/mud/Kconfig | 18 + drivers/gpu/drm/mud/Makefile | 4 + drivers/gpu/drm/mud/mud_drm.c | 1198 ++++++++++++++++++++++ drivers/gpu/drm/mud/mud_drm.h | 137 +++ drivers/gpu/drm/mud/mud_drm_gadget.c | 889 ++++++++++++++++ drivers/mfd/Kconfig | 8 + drivers/mfd/Makefile | 1 + drivers/mfd/mud.c | 580 +++++++++++ drivers/pinctrl/Kconfig | 9 + drivers/pinctrl/Makefile | 1 + drivers/pinctrl/pinctrl-mud.c | 657 ++++++++++++ drivers/pinctrl/pinctrl-mud.h | 89 ++ drivers/usb/gadget/Kconfig | 36 + drivers/usb/gadget/function/Makefile | 6 + drivers/usb/gadget/function/f_mud.c | 913 +++++++++++++++++ drivers/usb/gadget/function/f_mud.h | 210 ++++ drivers/usb/gadget/function/f_mud_drm.c | 181 ++++ drivers/usb/gadget/function/f_mud_pins.c | 962 +++++++++++++++++ drivers/usb/gadget/function/mud_regmap.c | 936 +++++++++++++++++ include/drm/drm_client.h | 4 + include/linux/mfd/mud.h | 16 + include/linux/regmap.h | 23 + include/linux/regmap_usb.h | 97 ++ 31 files changed, 8107 insertions(+), 5 deletions(-) create mode 100644 drivers/base/regmap/regmap-usb.c create mode 100644 drivers/gpu/drm/mud/Kconfig create mode 100644 drivers/gpu/drm/mud/Makefile create mode 100644 drivers/gpu/drm/mud/mud_drm.c create mode 100644 drivers/gpu/drm/mud/mud_drm.h create mode 100644 drivers/gpu/drm/mud/mud_drm_gadget.c create mode 100644 drivers/mfd/mud.c create mode 100644 drivers/pinctrl/pinctrl-mud.c create mode 100644 drivers/pinctrl/pinctrl-mud.h create mode 100644 drivers/usb/gadget/function/f_mud.c create mode 100644 drivers/usb/gadget/function/f_mud.h create mode 100644 drivers/usb/gadget/function/f_mud_drm.c create mode 100644 drivers/usb/gadget/function/f_mud_pins.c create mode 100644 drivers/usb/gadget/function/mud_regmap.c create mode 100644 include/linux/mfd/mud.h create mode 100644 include/linux/regmap_usb.h -- 2.23.0

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dri-devel February 2020