- 25 Oct, 2023 1 commit
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Simon Ser authored
The main motivation is to repeat that dumb buffers should not be abused for anything else than basic software rendering with KMS. User-space devs are more likely to look at the IOCTL docs than to actively search for the driver-oriented "Dumb Buffer Objects" section. v2: reference DRM_CAP_DUMB_BUFFER, DRM_CAP_DUMB_PREFERRED_DEPTH and DRM_CAP_DUMB_PREFER_SHADOW (Pekka) Signed-off-by: Simon Ser <contact@emersion.fr> Acked-by: Daniel Vetter <daniel.vetter@ffwll.ch> Acked-by: Pekka Paalanen <pekka.paalanen@collabora.com> Link: https://patchwork.freedesktop.org/patch/msgid/20230821131548.269204-1-contact@emersion.fr
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- 24 Oct, 2023 8 commits
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Jonas Karlman authored
Add support for displaying 10-bit 4:2:0 and 4:2:2 formats produced by the Rockchip Video Decoder on RK322X, RK3288, RK3328 and RK3399. Also add support for 10-bit 4:4:4 format while at it. V5: Use drm_format_info_min_pitch() for correct bpp Add missing NV21, NV61 and NV42 formats V4: Rework RK3328/RK3399 win0/1 data to not affect RK3368 V2: Added NV30 support Signed-off-by: Jonas Karlman <jonas@kwiboo.se> Reviewed-by: Sandy Huang <hjc@rock-chips.com> Reviewed-by: Christopher Obbard <chris.obbard@collabora.com> Tested-by: Christopher Obbard <chris.obbard@collabora.com> Signed-off-by: Heiko Stuebner <heiko@sntech.de> Link: https://patchwork.freedesktop.org/patch/msgid/20231023173718.188102-3-jonas@kwiboo.se
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Jonas Karlman authored
DRM_FORMAT_NV20 and DRM_FORMAT_NV30 formats is the 2x1 and non-subsampled variant of NV15, a 10-bit 2-plane YUV format that has no padding between components. Instead, luminance and chrominance samples are grouped into 4s so that each group is packed into an integer number of bytes: YYYY = UVUV = 4 * 10 bits = 40 bits = 5 bytes The '20' and '30' suffix refers to the optimum effective bits per pixel which is achieved when the total number of luminance samples is a multiple of 4. V2: Added NV30 format Signed-off-by: Jonas Karlman <jonas@kwiboo.se> Reviewed-by: Sandy Huang <hjc@rock-chips.com> Reviewed-by: Christopher Obbard <chris.obbard@collabora.com> Tested-by: Christopher Obbard <chris.obbard@collabora.com> Signed-off-by: Heiko Stuebner <heiko@sntech.de> Link: https://patchwork.freedesktop.org/patch/msgid/20231023173718.188102-2-jonas@kwiboo.se
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Andy Yan authored
formats_win_full_10bit is for cluster window, formats_win_full_10bit_yuyv is for rk356x esmart, rk3588 esmart window will support more format. formats_win_lite is for smart window. Rename it based the windows type may let meaning is clearer Signed-off-by: Andy Yan <andy.yan@rock-chips.com> Acked-by: Sascha Hauer <s.hauer@pengutronix.de> Signed-off-by: Heiko Stuebner <heiko@sntech.de> Link: https://patchwork.freedesktop.org/patch/msgid/20231018094339.2476142-1-andyshrk@163.com
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Andy Yan authored
Add 10 bit RGB and AFBC based YUV format supported by vop2. Signed-off-by: Andy Yan <andy.yan@rock-chips.com> Acked-by: Sascha Hauer <s.hauer@pengutronix.de> Signed-off-by: Heiko Stuebner <heiko@sntech.de> Link: https://patchwork.freedesktop.org/patch/msgid/20231018094318.2476081-1-andyshrk@163.com
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Andy Yan authored
The cluster window on vop2 doesn't support linear yuv format(NV12/16/24), it only support afbc based yuv format(DRM_FORMAT_YUV420_8BIT/10BIT), which will be added in next patch. Fixes: 604be855 ("drm/rockchip: Add VOP2 driver") Signed-off-by: Andy Yan <andy.yan@rock-chips.com> Acked-by: Sascha Hauer <s.hauer@pengutronix.de> Signed-off-by: Heiko Stuebner <heiko@sntech.de> Link: https://patchwork.freedesktop.org/patch/msgid/20231018094239.2475851-1-andyshrk@163.com
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Andy Yan authored
We can't rely on cpp for bpp calculation as the cpp of some formats(DRM_FORMAT_YUV420_8BIT/10BIT, etc) is zero. Signed-off-by: Andy Yan <andy.yan@rock-chips.com> Acked-by: Sascha Hauer <s.hauer@pengutronix.de> Signed-off-by: Heiko Stuebner <heiko@sntech.de> Link: https://patchwork.freedesktop.org/patch/msgid/20231018094210.2475771-1-andyshrk@163.com
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Liu Ying authored
In order to support burst mode, vendor drivers set lane_mbps higher than bandwidth through DPI interface. So, calculate horizontal component lane byte clock cycle(lbcc) based on lane_mbps instead of pixel clock rate for burst mode. Fixes: ac87d236 ("drm/bridge: synopsys: dw-mipi-dsi: Use pixel clock rate to calculate lbcc") Reported-by: Heiko Stübner <heiko@sntech.de> Closes: https://lore.kernel.org/linux-arm-kernel/5979575.UjTJXf6HLC@diego/T/#u Tested-by: Heiko Stübner <heiko@sntech.de> # px30 minievb with xinpeng xpp055c272 Signed-off-by: Liu Ying <victor.liu@nxp.com> Signed-off-by: Heiko Stuebner <heiko@sntech.de> Link: https://patchwork.freedesktop.org/patch/msgid/20231018035212.1778767-1-victor.liu@nxp.com
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Geert Uytterhoeven authored
Currently drm_client_buffer_addfb() uses the legacy drm_mode_addfb(), which uses bpp and depth to guess the wanted buffer format. However, drm_client_buffer_addfb() already knows the exact buffer format, so there is no need to convert back and forth between buffer format and bpp/depth, and the function can just call drm_mode_addfb2() directly instead. Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org> Reviewed-by: Javier Martinez Canillas <javierm@redhat.com> Tested-by: Javier Martinez Canillas <javierm@redhat.com> Signed-off-by: Hamza Mahfooz <hamza.mahfooz@amd.com> Link: https://patchwork.freedesktop.org/patch/msgid/4b84adfc686288714e69d0442d22f1259ff74903.1697379891.git.geert@linux-m68k.org
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- 23 Oct, 2023 9 commits
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Simon Ser authored
These will show up as monospace, and will get linkified as soon as we document the macro they point to. Signed-off-by: Simon Ser <contact@emersion.fr> Acked-by: Daniel Vetter <daniel.vetter@ffwll.ch> Acked-by: Pekka Paalanen <pekka.paalanen@collabora.com> Link: https://patchwork.freedesktop.org/patch/msgid/20230712135723.173506-1-contact@emersion.fr
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Dario Binacchi authored
Replace 'pack' with 'back'. Fixes: c8b75bca ("drm/vc4: Add KMS support for Raspberry Pi.") Signed-off-by: Dario Binacchi <dario.binacchi@amarulasolutions.com> Reviewed-by: Dave Stevenson <dave.stevenson@raspberrypi.com> Reviewed-by: Bagas Sanjaya <bagasdotme@gmail.com> Signed-off-by: Maxime Ripard <mripard@kernel.org> Link: https://patchwork.freedesktop.org/patch/msgid/20231023085929.1445594-1-dario.binacchi@amarulasolutions.com
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Deepak R Varma authored
The work items listed in the TODO file of this driver file are either completed or dropped. The file is no more significant according to the maintainers. Hence removing it from the sources. Suggested-by: Stanislaw Gruszka <stanislaw.gruszka@linux.intel.com> Signed-off-by: Deepak R Varma <drv@mailo.com> Reviewed-by: Stanislaw Gruszka <stanislaw.gruszka@linux.intel.com> Signed-off-by: Stanislaw Gruszka <stanislaw.gruszka@linux.intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/ZTAucrOT69/tQK2o@runicha.com
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Stanislaw Gruszka authored
We do not run 37xx VPU on non-silicon platforms any longer. Remove deprecated code to make it cleaner. Reviewed-by: Jeffrey Hugo <quic_jhugo@quicinc.com> Signed-off-by: Stanislaw Gruszka <stanislaw.gruszka@linux.intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20231020104501.697763-7-stanislaw.gruszka@linux.intel.com
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Stanislaw Gruszka authored
Initialize HW specific parameters only once. We do not have to do this on every power_up (performed during initialization and on resume). Move corresponding code to ->info_init() Reviewed-by: Jeffrey Hugo <quic_jhugo@quicinc.com> Signed-off-by: Stanislaw Gruszka <stanislaw.gruszka@linux.intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20231020104501.697763-6-stanislaw.gruszka@linux.intel.com
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Krystian Pradzynski authored
Introduce ivpu_jsm_msg_type_to_str() helper to print type of IPC message. This will make reading logs and debugging IPC issues easier. Co-developed-by: Maciej Falkowski <maciej.falkowski@intel.com> Signed-off-by: Maciej Falkowski <maciej.falkowski@intel.com> Signed-off-by: Krystian Pradzynski <krystian.pradzynski@linux.intel.com> Reviewed-by: Stanislaw Gruszka <stanislaw.gruszka@linux.intel.com> Reviewed-by: Jeffrey Hugo <quic_jhugo@quicinc.com> Signed-off-by: Stanislaw Gruszka <stanislaw.gruszka@linux.intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20231020104501.697763-5-stanislaw.gruszka@linux.intel.com
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Karol Wachowski authored
Do not unnecessarily wake up device to read clock rate. Return 0 as clk_rate if device is suspended. Signed-off-by: Karol Wachowski <karol.wachowski@linux.intel.com> Reviewed-by: Stanislaw Gruszka <stanislaw.gruszka@linux.intel.com> Reviewed-by: Jeffrey Hugo <quic_jhugo@quicinc.com> Signed-off-by: Stanislaw Gruszka <stanislaw.gruszka@linux.intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20231020104501.697763-4-stanislaw.gruszka@linux.intel.com
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Krystian Pradzynski authored
Remove two out of four _POLL macros. For two remaining _POLL macros add message about polling register start and finish. Additionally avoid inconsequence when using REGV_WR/RD macros in MMU code - passing raw register offset instead of register name. Signed-off-by: Krystian Pradzynski <krystian.pradzynski@linux.intel.com> Reviewed-by: Stanislaw Gruszka <stanislaw.gruszka@linux.intel.com> Reviewed-by: Jeffrey Hugo <quic_jhugo@quicinc.com> Signed-off-by: Stanislaw Gruszka <stanislaw.gruszka@linux.intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20231020104501.697763-3-stanislaw.gruszka@linux.intel.com
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Krystian Pradzynski authored
Quite often during test corner cases IPC, JSM functions can flood dmesg with warn or err messages. With that lost dmesg history. Change warn, err to ratelimited versions in IPC, JSM to suppress dmesg spam occurrence during fail test scenarios. Signed-off-by: Krystian Pradzynski <krystian.pradzynski@linux.intel.com> Reviewed-by: Stanislaw Gruszka <stanislaw.gruszka@linux.intel.com> Reviewed-by: Jeffrey Hugo <quic_jhugo@quicinc.com> Signed-off-by: Stanislaw Gruszka <stanislaw.gruszka@linux.intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20231020104501.697763-2-stanislaw.gruszka@linux.intel.com
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- 19 Oct, 2023 22 commits
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Cong Yang authored
DRM_PANEL_ILITEK_ILI9882T is being split out from DRM_PANEL_BOE_TV101WUM_NL6. Since the arm64 defconfig had the BOE panel driver enabled, let's also enable the Ilitek driver. Reviewed-by: Douglas Anderson <dianders@chromium.org> Signed-off-by: Cong Yang <yangcong5@huaqin.corp-partner.google.com> Signed-off-by: Douglas Anderson <dianders@chromium.org> Link: https://patchwork.freedesktop.org/patch/msgid/20231013091844.804310-4-yangcong5@huaqin.corp-partner.google.com
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Cong Yang authored
At present, we have found that there may be a problem of blurred screen during fast sleep/resume. The direct cause of the blurred screen is that the IC does not receive 0x28/0x10. Because of the particularity of the IC, before the panel enters sleep hid must stop scanning, as i2c_hid_core_suspend before ili9882t_disable. If move the ili9882t_enter_sleep_mode function to ili9882t_unprepare, touch reset will pull low before panel entersleep, which does not meet the timing requirements.. So in order to solve this problem, the IC can handle it through the exception mechanism when it cannot receive 0x28/0x10 command. Handling exceptions requires a reset 50ms delay. Refer to vendor detailed analysis [1]. Ilitek vendor also suggested switching the page before entering sleep to avoid panel IC not receiving 0x28/0x10 command. Note: 0x28 is display off, 0x10 is sleep in. [1]: https://github.com/ILITEK-LoganLin/Document/tree/main/ILITEK_Power_SequenceSigned-off-by: Cong Yang <yangcong5@huaqin.corp-partner.google.com> Reviewed-by: Douglas Anderson <dianders@chromium.org> Signed-off-by: Douglas Anderson <dianders@chromium.org> Link: https://patchwork.freedesktop.org/patch/msgid/20231013091844.804310-3-yangcong5@huaqin.corp-partner.google.com
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Cong Yang authored
The Starry ILI9882t-based panel should never have been part of the boe tv101wum driver, it is clearly based on the Ilitek ILI9882t display controller and if you look at the custom command sequences for the panel these clearly contain the signature Ilitek page switch (0xff) commands. The hardware has nothing in common with the other panels supported by this driver. Break this out into a separate driver and config symbol instead. If the placement here is out of convenience for using similar code, we should consider creating a helper library instead. Co-developed-by: Linus Walleij <linus.walleij@linaro.org> Signed-off-by: Linus Walleij <linus.walleij@linaro.org> Reviewed-by: Linus Walleij <linus.walleij@linaro.org> Reviewed-by: Douglas Anderson <dianders@chromium.org> Signed-off-by: Cong Yang <yangcong5@huaqin.corp-partner.google.com> Signed-off-by: Douglas Anderson <dianders@chromium.org> Link: https://patchwork.freedesktop.org/patch/msgid/20231013091844.804310-2-yangcong5@huaqin.corp-partner.google.com
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Thomas Zimmermann authored
Improve readability by putting all register constants into a separate header file. No functional changes. Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de> Reviewed-by: Jocelyn Falempe <jfalempe@redhat.com> Link: https://patchwork.freedesktop.org/patch/msgid/20231017083653.10063-13-tzimmermann@suse.de
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Thomas Zimmermann authored
Rename AST_IO_MISC_PORT_READ to AST_IO_VGAMR_R to align naming in the driver with documentation. No functional changes. Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de> Reviewed-by: Jocelyn Falempe <jfalempe@redhat.com> Link: https://patchwork.freedesktop.org/patch/msgid/20231017083653.10063-12-tzimmermann@suse.de
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Thomas Zimmermann authored
Rename AST_IO_INPUT_STATUS1_READ to AST_IO_VGAIR1_R to align naming in the driver with documentation. No functional changes. Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de> Reviewed-by: Jocelyn Falempe <jfalempe@redhat.com> Link: https://patchwork.freedesktop.org/patch/msgid/20231017083653.10063-11-tzimmermann@suse.de
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Thomas Zimmermann authored
Rename AST_IO_CRTC_PORT to AST_IO_VGACRI to align naming in the driver with documentation. No functional changes. Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de> Reviewed-by: Jocelyn Falempe <jfalempe@redhat.com> Link: https://patchwork.freedesktop.org/patch/msgid/20231017083653.10063-10-tzimmermann@suse.de
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Thomas Zimmermann authored
Rename AST_IO_GR_PORT to AST_IO_VGAGRI to align naming in the driver with documentation. No functional changes. Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de> Reviewed-by: Jocelyn Falempe <jfalempe@redhat.com> Link: https://patchwork.freedesktop.org/patch/msgid/20231017083653.10063-9-tzimmermann@suse.de
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Thomas Zimmermann authored
Rename AST_IO_DAC_DATA to AST_IO_VGAPDR to align naming in the driver with documentation. No functional changes. Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de> Reviewed-by: Jocelyn Falempe <jfalempe@redhat.com> Link: https://patchwork.freedesktop.org/patch/msgid/20231017083653.10063-8-tzimmermann@suse.de
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Thomas Zimmermann authored
Rename AST_IO_DAC_INDEX_WRITE to AST_IO_VGADWR to align naming in the driver with documentation. No functional changes. Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de> Reviewed-by: Jocelyn Falempe <jfalempe@redhat.com> Link: https://patchwork.freedesktop.org/patch/msgid/20231017083653.10063-7-tzimmermann@suse.de
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Thomas Zimmermann authored
Rename AST_IO_DAC_INDEX_READ to AST_IO_VGADRR to align naming in the driver with documentation. No functional changes. Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de> Reviewed-by: Jocelyn Falempe <jfalempe@redhat.com> Link: https://patchwork.freedesktop.org/patch/msgid/20231017083653.10063-6-tzimmermann@suse.de
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Thomas Zimmermann authored
Rename AST_IO_VGA_SEQ_PORT to AST_IO_VGASRI to align naming in the driver with documentation. No functional changes. Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de> Reviewed-by: Jocelyn Falempe <jfalempe@redhat.com> Link: https://patchwork.freedesktop.org/patch/msgid/20231017083653.10063-5-tzimmermann@suse.de
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Thomas Zimmermann authored
Rename AST_IO_VGA_ENABLE_PORT to AST_IO_VGAER to align naming in the driver with documentation. No functional changes. Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de> Reviewed-by: Jocelyn Falempe <jfalempe@redhat.com> Link: https://patchwork.freedesktop.org/patch/msgid/20231017083653.10063-4-tzimmermann@suse.de
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Thomas Zimmermann authored
Rename AST_IO_MISC_PORT_WRITE to AST_IO_VGAMR_W to align naming in the driver with documentation. No functional changes. Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de> Reviewed-by: Jocelyn Falempe <jfalempe@redhat.com> Link: https://patchwork.freedesktop.org/patch/msgid/20231017083653.10063-3-tzimmermann@suse.de
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Thomas Zimmermann authored
Rename AST_IO_AR_PORT_WRITE to AST_IO_VGAARI_W to align naming in the driver with documentation. No functional changes. Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de> Reviewed-by: Jocelyn Falempe <jfalempe@redhat.com> Link: https://patchwork.freedesktop.org/patch/msgid/20231017083653.10063-2-tzimmermann@suse.de
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Thomas Zimmermann authored
Initialize the instance of struct fb_ops with fbdev initializer macros for framebuffers in I/O address space. Set the read/write, draw and mmap callbacks to the correct implementation and avoid implicit defaults. Also select the necessary I/O helpers in Kconfig. Fbdev drivers sometimes rely on the callbacks being NULL for a default implementation to be invoked; hence requiring the I/O helpers to be built in any case. Setting all callbacks in all drivers explicitly will allow to make the I/O helpers optional. This benefits systems that do not use these functions. No functional changes. Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de> Acked-by: Javier Martinez Canillas <javierm@redhat.com> Link: https://patchwork.freedesktop.org/patch/msgid/20230927074722.6197-47-tzimmermann@suse.de
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Thomas Zimmermann authored
Initialize the instance of struct fb_ops with fbdev initializer macros for framebuffers in I/O address space. Set the read/write, draw and mmap callbacks to the correct implementation and avoid implicit defaults. Also select the necessary I/O helpers in Kconfig. Fbdev drivers sometimes rely on the callbacks being NULL for a default implementation to be invoked; hence requiring the I/O helpers to be built in any case. Setting all callbacks in all drivers explicitly will allow to make the I/O helpers optional. This benefits systems that do not use these functions. No functional changes. Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de> Acked-by: Javier Martinez Canillas <javierm@redhat.com> Cc: Florian Tobias Schandinat <FlorianSchandinat@gmx.de> Link: https://patchwork.freedesktop.org/patch/msgid/20230927074722.6197-46-tzimmermann@suse.de
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Thomas Zimmermann authored
Initialize the instance of struct fb_ops with fbdev initializer macros for framebuffers in I/O address space. Set the read/write, draw and mmap callbacks to the correct implementation and avoid implicit defaults. Also select the necessary I/O helpers in Kconfig. Fbdev drivers sometimes rely on the callbacks being NULL for a default implementation to be invoked; hence requiring the I/O helpers to be built in any case. Setting all callbacks in all drivers explicitly will allow to make the I/O helpers optional. This benefits systems that do not use these functions. No functional changes. Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de> Acked-by: Javier Martinez Canillas <javierm@redhat.com> Link: https://patchwork.freedesktop.org/patch/msgid/20230927074722.6197-45-tzimmermann@suse.de
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Thomas Zimmermann authored
Initialize the instance of struct fb_ops with fbdev initializer macros for framebuffers in I/O address space. Set the read/write, draw and mmap callbacks to the correct implementation and avoid implicit defaults. Also select the necessary I/O helpers in Kconfig. Fbdev drivers sometimes rely on the callbacks being NULL for a default implementation to be invoked; hence requiring the I/O helpers to be built in any case. Setting all callbacks in all drivers explicitly will allow to make the I/O helpers optional. This benefits systems that do not use these functions. No functional changes. Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de> Acked-by: Javier Martinez Canillas <javierm@redhat.com> Link: https://patchwork.freedesktop.org/patch/msgid/20230927074722.6197-44-tzimmermann@suse.de
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Thomas Zimmermann authored
Initialize the instance of struct fb_ops with fbdev initializer macros for framebuffers in I/O address space. Set the read/write, draw and mmap callbacks to the correct implementation and avoid implicit defaults. Also select the necessary I/O helpers in Kconfig. Fbdev drivers sometimes rely on the callbacks being NULL for a default implementation to be invoked; hence requiring the I/O helpers to be built in any case. Setting all callbacks in all drivers explicitly will allow to make the I/O helpers optional. This benefits systems that do not use these functions. No functional changes. Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de> Acked-by: Javier Martinez Canillas <javierm@redhat.com> Link: https://patchwork.freedesktop.org/patch/msgid/20230927074722.6197-43-tzimmermann@suse.de
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Thomas Zimmermann authored
Initialize the instance of struct fb_ops with fbdev initializer macros for framebuffers in I/O address space. Set the read/write, draw and mmap callbacks to the correct implementation and avoid implicit defaults. Also select the necessary I/O helpers in Kconfig. Fbdev drivers sometimes rely on the callbacks being NULL for a default implementation to be invoked; hence requiring the I/O helpers to be built in any case. Setting all callbacks in all drivers explicitly will allow to make the I/O helpers optional. This benefits systems that do not use these functions. No functional changes. Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de> Acked-by: Javier Martinez Canillas <javierm@redhat.com> Link: https://patchwork.freedesktop.org/patch/msgid/20230927074722.6197-42-tzimmermann@suse.de
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Thomas Zimmermann authored
Initialize the instance of struct fb_ops with fbdev initializer macros for framebuffers in I/O address space. Set the read/write, draw and mmap callbacks to the correct implementation and avoid implicit defaults. Also select the necessary I/O helpers in Kconfig. Fbdev drivers sometimes rely on the callbacks being NULL for a default implementation to be invoked; hence requiring the I/O helpers to be built in any case. Setting all callbacks in all drivers explicitly will allow to make the I/O helpers optional. This benefits systems that do not use these functions. No functional changes. Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de> Acked-by: Javier Martinez Canillas <javierm@redhat.com> Link: https://patchwork.freedesktop.org/patch/msgid/20230927074722.6197-41-tzimmermann@suse.de
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