| Message ID | 20220218160436.23211-1-msuchanek@suse.de (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | [v3] simplefb: Enable boot time VESA graphic mode selection. | expand |
Hi Am 18.02.22 um 17:04 schrieb Michal Suchanek: > Since switch to simplefb/simpledrm VESA graphic modes are no longer > available with legacy BIOS. > > The x86 realmode boot code enables the VESA graphic modes when option > FB_BOOT_VESA_SUPPORT is enabled. > > To enable use of VESA modes with simplefb in legacy BIOS boot mode drop > dependency of BOOT_VESA_SUPPORT on FB, also drop the FB_ prefix, and > select the option when simplefb enabled on x86. > > The BOOT_VESA_SUPPORT is not specific to framebuffer but rather to x86 > platform, move it from fbdev to x86 Kconfig. > > Fixes: e3263ab389a7 ("x86: provide platform-devices for boot-framebuffers") > Signed-off-by: Michal Suchanek <msuchanek@suse.de> Acked-by: Thomas Zimmermann <tzimmermann@suse.de> Thanks for the patch. I'll wait a bit for additional reviews before merging it. Best regards Thomas > --- > v2: Select BOOT_VESA_SUPPORT from simplefb rather than simpledrm. The > simpledrm driver uses the firmware provided video modes only indirectly > through simplefb, and both can be enabled independently. > v3: Move BOOT_VESA_SUPPORT from fbdev to x86 > --- > arch/x86/Kconfig | 6 ++++++ > arch/x86/boot/video-vesa.c | 4 ++-- > drivers/firmware/Kconfig | 1 + > drivers/video/fbdev/Kconfig | 13 +++---------- > 4 files changed, 12 insertions(+), 12 deletions(-) > > diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig > index 9f5bd41bf660..cceb1aab0486 100644 > --- a/arch/x86/Kconfig > +++ b/arch/x86/Kconfig > @@ -942,6 +942,12 @@ config GART_IOMMU > > If unsure, say Y. > > +config BOOT_VESA_SUPPORT > + bool > + help > + If true, at least one selected framebuffer driver can take advantage > + of VESA video modes set at an early boot stage via the vga= parameter. > + > config MAXSMP > bool "Enable Maximum number of SMP Processors and NUMA Nodes" > depends on X86_64 && SMP && DEBUG_KERNEL > diff --git a/arch/x86/boot/video-vesa.c b/arch/x86/boot/video-vesa.c > index 7e185977a984..c2c6d35e3a43 100644 > --- a/arch/x86/boot/video-vesa.c > +++ b/arch/x86/boot/video-vesa.c > @@ -83,7 +83,7 @@ static int vesa_probe(void) > (vminfo.memory_layout == 4 || > vminfo.memory_layout == 6) && > vminfo.memory_planes == 1) { > -#ifdef CONFIG_FB_BOOT_VESA_SUPPORT > +#ifdef CONFIG_BOOT_VESA_SUPPORT > /* Graphics mode, color, linear frame buffer > supported. Only register the mode if > if framebuffer is configured, however, > @@ -121,7 +121,7 @@ static int vesa_set_mode(struct mode_info *mode) > if ((vminfo.mode_attr & 0x15) == 0x05) { > /* It's a supported text mode */ > is_graphic = 0; > -#ifdef CONFIG_FB_BOOT_VESA_SUPPORT > +#ifdef CONFIG_BOOT_VESA_SUPPORT > } else if ((vminfo.mode_attr & 0x99) == 0x99) { > /* It's a graphics mode with linear frame buffer */ > is_graphic = 1; > diff --git a/drivers/firmware/Kconfig b/drivers/firmware/Kconfig > index 75cb91055c17..ad64f3a6f54f 100644 > --- a/drivers/firmware/Kconfig > +++ b/drivers/firmware/Kconfig > @@ -224,6 +224,7 @@ config SYSFB > config SYSFB_SIMPLEFB > bool "Mark VGA/VBE/EFI FB as generic system framebuffer" > depends on SYSFB > + select BOOT_VESA_SUPPORT > help > Firmwares often provide initial graphics framebuffers so the BIOS, > bootloader or kernel can show basic video-output during boot for > diff --git a/drivers/video/fbdev/Kconfig b/drivers/video/fbdev/Kconfig > index 6ed5e608dd04..5bdd303b5268 100644 > --- a/drivers/video/fbdev/Kconfig > +++ b/drivers/video/fbdev/Kconfig > @@ -66,13 +66,6 @@ config FB_DDC > select I2C_ALGOBIT > select I2C > > -config FB_BOOT_VESA_SUPPORT > - bool > - depends on FB > - help > - If true, at least one selected framebuffer driver can take advantage > - of VESA video modes set at an early boot stage via the vga= parameter. > - > config FB_CFB_FILLRECT > tristate > depends on FB > @@ -627,7 +620,7 @@ config FB_VESA > select FB_CFB_FILLRECT > select FB_CFB_COPYAREA > select FB_CFB_IMAGEBLIT > - select FB_BOOT_VESA_SUPPORT > + select BOOT_VESA_SUPPORT > help > This is the frame buffer device driver for generic VESA 2.0 > compliant graphic cards. The older VESA 1.2 cards are not supported. > @@ -1051,7 +1044,7 @@ config FB_INTEL > select FB_CFB_FILLRECT > select FB_CFB_COPYAREA > select FB_CFB_IMAGEBLIT > - select FB_BOOT_VESA_SUPPORT if FB_INTEL = y > + select BOOT_VESA_SUPPORT if FB_INTEL = y > depends on !DRM_I915 > help > This driver supports the on-board graphics built in to the Intel > @@ -1378,7 +1371,7 @@ config FB_SIS > select FB_CFB_FILLRECT > select FB_CFB_COPYAREA > select FB_CFB_IMAGEBLIT > - select FB_BOOT_VESA_SUPPORT if FB_SIS = y > + select BOOT_VESA_SUPPORT if FB_SIS = y > select FB_SIS_300 if !FB_SIS_315 > help > This is the frame buffer device driver for the SiS 300, 315, 330
Hello Michal, On 2/18/22 17:04, Michal Suchanek wrote: > Since switch to simplefb/simpledrm VESA graphic modes are no longer > available with legacy BIOS. > Maybe you can mention that is the "vga=" kernel command line parameter since that may be more evident to people reading the commit message ? > The x86 realmode boot code enables the VESA graphic modes when option > FB_BOOT_VESA_SUPPORT is enabled. > > To enable use of VESA modes with simplefb in legacy BIOS boot mode drop I think you meant "VESA modes with the sysfb driver" ? or something like that since otherwise it seems that you meant to use it with the simplefb (drivers/video/fbdev/simplefb.c) fbdev driver, which doesn't support the "vga=" param as far as I understand (it just uses whatever was setup). The name sysfb_simplefb is really horrible, because it is too confusing and probably we should change it at some point... Patch itself looks good to me though. Reviewed-by: Javier Martinez Canillas <javierm@redhat.com> Best regards,
On Wed, Feb 23, 2022 at 05:34:50PM +0100, Javier Martinez Canillas wrote: > Hello Michal, > > On 2/18/22 17:04, Michal Suchanek wrote: > > Since switch to simplefb/simpledrm VESA graphic modes are no longer > > available with legacy BIOS. > > Maybe you can mention that is the "vga=" kernel command line parameter > since that may be more evident to people reading the commit message ? Yes, I suppose that could be added. > > The x86 realmode boot code enables the VESA graphic modes when option > > FB_BOOT_VESA_SUPPORT is enabled. > > > > To enable use of VESA modes with simplefb in legacy BIOS boot mode drop > > I think you meant "VESA modes with the sysfb driver" ? or something like > that since otherwise it seems that you meant to use it with the simplefb > (drivers/video/fbdev/simplefb.c) fbdev driver, which doesn't support the > "vga=" param as far as I understand (it just uses whatever was setup). And the vga= is whatever was set up by the realmode code. And the config option for realmode code to do that is selected by vesafb and not simplefb so it does not wotk for simplefb/simpledrm/whatewer when efifib is not built into the kernel. > The name sysfb_simplefb is really horrible, because it is too confusing > and probably we should change it at some point... > > Patch itself looks good to me though. > > Reviewed-by: Javier Martinez Canillas <javierm@redhat.com> Thanks Michal
On 2/23/22 17:45, Michal Suchánek wrote: [snip] >>> >>> To enable use of VESA modes with simplefb in legacy BIOS boot mode drop >> >> I think you meant "VESA modes with the sysfb driver" ? or something like >> that since otherwise it seems that you meant to use it with the simplefb >> (drivers/video/fbdev/simplefb.c) fbdev driver, which doesn't support the >> "vga=" param as far as I understand (it just uses whatever was setup). > > And the vga= is whatever was set up by the realmode code. And the config > option for realmode code to do that is selected by vesafb and not > simplefb so it does not wotk for simplefb/simpledrm/whatewer when efifib > is not built into the kernel. > Yes, that's what I tried to say. But your commit message says "To enable use of VESA modes with simplefb in legacy BIOS boot mode" and that isn't accurate AFAIU (unless you meant sysfb instead). Best regards,
On 2/23/22 17:54, Javier Martinez Canillas wrote: > On 2/23/22 17:45, Michal Suchánek wrote: > > [snip] > >>>> >>>> To enable use of VESA modes with simplefb in legacy BIOS boot mode drop >>> >>> I think you meant "VESA modes with the sysfb driver" ? or something like >>> that since otherwise it seems that you meant to use it with the simplefb >>> (drivers/video/fbdev/simplefb.c) fbdev driver, which doesn't support the >>> "vga=" param as far as I understand (it just uses whatever was setup). >> >> And the vga= is whatever was set up by the realmode code. And the config >> option for realmode code to do that is selected by vesafb and not >> simplefb so it does not wotk for simplefb/simpledrm/whatewer when efifib >> is not built into the kernel. >> > > Yes, that's what I tried to say. But your commit message says "To enable > use of VESA modes with simplefb in legacy BIOS boot mode" and that isn't > accurate AFAIU (unless you meant sysfb instead). In fact, probably the subject line should also be something like following: firmware: sysfb: Enable boot time VESA graphic mode selection Best regards,
On Wed, Feb 23, 2022 at 05:54:54PM +0100, Javier Martinez Canillas wrote: > On 2/23/22 17:45, Michal Suchánek wrote: > > [snip] > > >>> > >>> To enable use of VESA modes with simplefb in legacy BIOS boot mode drop > >> > >> I think you meant "VESA modes with the sysfb driver" ? or something like > >> that since otherwise it seems that you meant to use it with the simplefb > >> (drivers/video/fbdev/simplefb.c) fbdev driver, which doesn't support the > >> "vga=" param as far as I understand (it just uses whatever was setup). > > > > And the vga= is whatever was set up by the realmode code. And the config > > option for realmode code to do that is selected by vesafb and not > > simplefb so it does not wotk for simplefb/simpledrm/whatewer when efifib > > is not built into the kernel. > > > > Yes, that's what I tried to say. But your commit message says "To enable > use of VESA modes with simplefb in legacy BIOS boot mode" and that isn't > accurate AFAIU (unless you meant sysfb instead). config SYSFB_SIMPLEFB bool "Mark VGA/VBE/EFI FB as generic system framebuffer" depends on SYSFB + select BOOT_VESA_SUPPORT if X86 This to me means that it's simplefb specifically that requires it, not sysfb. More precisely SYSFB_SIMPLEFB which is the simplefb implementation on top of legacy BIOS. Thanks Michal
On 2/23/22 18:12, Michal Suchánek wrote: > On Wed, Feb 23, 2022 at 05:54:54PM +0100, Javier Martinez Canillas wrote: [snip] >> >> Yes, that's what I tried to say. But your commit message says "To enable >> use of VESA modes with simplefb in legacy BIOS boot mode" and that isn't >> accurate AFAIU (unless you meant sysfb instead). > > config SYSFB_SIMPLEFB > bool "Mark VGA/VBE/EFI FB as generic system framebuffer" > depends on SYSFB > + select BOOT_VESA_SUPPORT if X86 > > This to me means that it's simplefb specifically that requires it, not sysfb. > More precisely SYSFB_SIMPLEFB which is the simplefb implementation on top of > legacy BIOS. > Ok, I see what you meant. The fact that simplefb is what's named to the part of the sysfb driver that register the "simple-framebuffer" platform device and also the name of the fbdev driver that matches the "simple-framebuffer" is too confusing. My point about the subject line remains thought, I would use something like: firmware: sysfb: Enable boot time VESA graphic mode selection for simplefb But I'll stop bike-shedding this. I don't mind if you keep the current line and feel free to keep my r-b tag. Best regards,
On Wed, Feb 23, 2022 at 07:13:07PM +0100, Javier Martinez Canillas wrote: > On 2/23/22 18:12, Michal Suchánek wrote: > > On Wed, Feb 23, 2022 at 05:54:54PM +0100, Javier Martinez Canillas wrote: > > [snip] > > >> > >> Yes, that's what I tried to say. But your commit message says "To enable > >> use of VESA modes with simplefb in legacy BIOS boot mode" and that isn't > >> accurate AFAIU (unless you meant sysfb instead). > > > > config SYSFB_SIMPLEFB > > bool "Mark VGA/VBE/EFI FB as generic system framebuffer" > > depends on SYSFB > > + select BOOT_VESA_SUPPORT if X86 > > > > This to me means that it's simplefb specifically that requires it, not sysfb. > > More precisely SYSFB_SIMPLEFB which is the simplefb implementation on top of > > legacy BIOS. > > > > Ok, I see what you meant. The fact that simplefb is what's named to the part > of the sysfb driver that register the "simple-framebuffer" platform device > and also the name of the fbdev driver that matches the "simple-framebuffer" > is too confusing. > > My point about the subject line remains thought, I would use something like: > > firmware: sysfb: Enable boot time VESA graphic mode selection for simplefb I see where the confusion comes from. The efifb (and probably vesafb) has implicit unstated dependency on sysfb. So the drivers that select BOOT_VESA_SUPPORT should instead depend on SYSFB, and then SYSFB can select BOOT_VESA_SUPPORT, and it will look much saner. Thanks Michal
On 2/23/22 19:23, Michal Suchánek wrote: [snip] >> My point about the subject line remains thought, I would use something like: >> >> firmware: sysfb: Enable boot time VESA graphic mode selection for simplefb > > I see where the confusion comes from. > Yeah. And just to clarify, the "simplefb" in the subject line I proposed was about the sysfb simplefb and not the fbdev simplefb :) > The efifb (and probably vesafb) has implicit unstated dependency on > sysfb. So the drivers that select BOOT_VESA_SUPPORT should instead > depend on SYSFB, and then SYSFB can select BOOT_VESA_SUPPORT, and it > will look much saner. > That indeed would be much nicer. And I agree with you that there's an implicit dependency that should be made explicit since SYSFB is what registers the "efi-framebuffer" or "vesa-framebuffer" if SYSFB_SIMPLEFB is not enabled. Should SYSFB should only select BOOT_VESA_SUPPORT if x86 ? I know that in practice shouldn't matter because BOOT_VESA_SUPPORT is under x86 but I guess is more correct if that's the case. And I think that FB_SIMPLE should depend on SYSFB_SIMPLEFB if !OF (since a "simple-framebuffer" platform device could be registered by OF if a Device Tree node with compatible "simple-framebuffer" exists). Best regards, -- Javier Martinez Canillas Linux Engineering Red Hat
On Mon, Feb 21, 2022 at 10:51:35AM +0100, Thomas Zimmermann wrote: > Thanks for the patch. I'll wait a bit for additional reviews before merging > it. for the x86 bits: Acked-by: Borislav Petkov <bp@suse.de>
On Wed, Feb 23, 2022 at 07:34:54PM +0100, Javier Martinez Canillas wrote: > On 2/23/22 19:23, Michal Suchánek wrote: > > [snip] > > >> My point about the subject line remains thought, I would use something like: > >> > >> firmware: sysfb: Enable boot time VESA graphic mode selection for simplefb > > > > I see where the confusion comes from. > > > > Yeah. And just to clarify, the "simplefb" in the subject line I proposed > was about the sysfb simplefb and not the fbdev simplefb :) > > > The efifb (and probably vesafb) has implicit unstated dependency on > > sysfb. So the drivers that select BOOT_VESA_SUPPORT should instead > > depend on SYSFB, and then SYSFB can select BOOT_VESA_SUPPORT, and it > > will look much saner. > > > > That indeed would be much nicer. And I agree with you that there's an > implicit dependency that should be made explicit since SYSFB is what > registers the "efi-framebuffer" or "vesa-framebuffer" if SYSFB_SIMPLEFB > is not enabled. > > Should SYSFB should only select BOOT_VESA_SUPPORT if x86 ? I know that > in practice shouldn't matter because BOOT_VESA_SUPPORT is under x86 but > I guess is more correct if that's the case. Part of the reason to move it to x86 is to avoid the conditional. Technically there is nothing stopping other platforms from running the VESA BIOS, it's just not very practical. > And I think that FB_SIMPLE should depend on SYSFB_SIMPLEFB if !OF (since > a "simple-framebuffer" platform device could be registered by OF if a > Device Tree node with compatible "simple-framebuffer" exists). So generally SYSFB_SIMPLEFB || OF. The part that you can enable the driver and it does not do anything because you are missing SYSFB_SIMPLEFB is indeed confusing. There is a comment in SIMLEDRM description but not FB_SIMPLE. Then there is the part that if neither simplefb nor vesafb nor efifb nor offb is built then the sysfb code is unused. Thanks Michal
diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig index 9f5bd41bf660..cceb1aab0486 100644 --- a/arch/x86/Kconfig +++ b/arch/x86/Kconfig @@ -942,6 +942,12 @@ config GART_IOMMU If unsure, say Y. +config BOOT_VESA_SUPPORT + bool + help + If true, at least one selected framebuffer driver can take advantage + of VESA video modes set at an early boot stage via the vga= parameter. + config MAXSMP bool "Enable Maximum number of SMP Processors and NUMA Nodes" depends on X86_64 && SMP && DEBUG_KERNEL diff --git a/arch/x86/boot/video-vesa.c b/arch/x86/boot/video-vesa.c index 7e185977a984..c2c6d35e3a43 100644 --- a/arch/x86/boot/video-vesa.c +++ b/arch/x86/boot/video-vesa.c @@ -83,7 +83,7 @@ static int vesa_probe(void) (vminfo.memory_layout == 4 || vminfo.memory_layout == 6) && vminfo.memory_planes == 1) { -#ifdef CONFIG_FB_BOOT_VESA_SUPPORT +#ifdef CONFIG_BOOT_VESA_SUPPORT /* Graphics mode, color, linear frame buffer supported. Only register the mode if if framebuffer is configured, however, @@ -121,7 +121,7 @@ static int vesa_set_mode(struct mode_info *mode) if ((vminfo.mode_attr & 0x15) == 0x05) { /* It's a supported text mode */ is_graphic = 0; -#ifdef CONFIG_FB_BOOT_VESA_SUPPORT +#ifdef CONFIG_BOOT_VESA_SUPPORT } else if ((vminfo.mode_attr & 0x99) == 0x99) { /* It's a graphics mode with linear frame buffer */ is_graphic = 1; diff --git a/drivers/firmware/Kconfig b/drivers/firmware/Kconfig index 75cb91055c17..ad64f3a6f54f 100644 --- a/drivers/firmware/Kconfig +++ b/drivers/firmware/Kconfig @@ -224,6 +224,7 @@ config SYSFB config SYSFB_SIMPLEFB bool "Mark VGA/VBE/EFI FB as generic system framebuffer" depends on SYSFB + select BOOT_VESA_SUPPORT help Firmwares often provide initial graphics framebuffers so the BIOS, bootloader or kernel can show basic video-output during boot for diff --git a/drivers/video/fbdev/Kconfig b/drivers/video/fbdev/Kconfig index 6ed5e608dd04..5bdd303b5268 100644 --- a/drivers/video/fbdev/Kconfig +++ b/drivers/video/fbdev/Kconfig @@ -66,13 +66,6 @@ config FB_DDC select I2C_ALGOBIT select I2C -config FB_BOOT_VESA_SUPPORT - bool - depends on FB - help - If true, at least one selected framebuffer driver can take advantage - of VESA video modes set at an early boot stage via the vga= parameter. - config FB_CFB_FILLRECT tristate depends on FB @@ -627,7 +620,7 @@ config FB_VESA select FB_CFB_FILLRECT select FB_CFB_COPYAREA select FB_CFB_IMAGEBLIT - select FB_BOOT_VESA_SUPPORT + select BOOT_VESA_SUPPORT help This is the frame buffer device driver for generic VESA 2.0 compliant graphic cards. The older VESA 1.2 cards are not supported. @@ -1051,7 +1044,7 @@ config FB_INTEL select FB_CFB_FILLRECT select FB_CFB_COPYAREA select FB_CFB_IMAGEBLIT - select FB_BOOT_VESA_SUPPORT if FB_INTEL = y + select BOOT_VESA_SUPPORT if FB_INTEL = y depends on !DRM_I915 help This driver supports the on-board graphics built in to the Intel @@ -1378,7 +1371,7 @@ config FB_SIS select FB_CFB_FILLRECT select FB_CFB_COPYAREA select FB_CFB_IMAGEBLIT - select FB_BOOT_VESA_SUPPORT if FB_SIS = y + select BOOT_VESA_SUPPORT if FB_SIS = y select FB_SIS_300 if !FB_SIS_315 help This is the frame buffer device driver for the SiS 300, 315, 330
Since switch to simplefb/simpledrm VESA graphic modes are no longer available with legacy BIOS. The x86 realmode boot code enables the VESA graphic modes when option FB_BOOT_VESA_SUPPORT is enabled. To enable use of VESA modes with simplefb in legacy BIOS boot mode drop dependency of BOOT_VESA_SUPPORT on FB, also drop the FB_ prefix, and select the option when simplefb enabled on x86. The BOOT_VESA_SUPPORT is not specific to framebuffer but rather to x86 platform, move it from fbdev to x86 Kconfig. Fixes: e3263ab389a7 ("x86: provide platform-devices for boot-framebuffers") Signed-off-by: Michal Suchanek <msuchanek@suse.de> --- v2: Select BOOT_VESA_SUPPORT from simplefb rather than simpledrm. The simpledrm driver uses the firmware provided video modes only indirectly through simplefb, and both can be enabled independently. v3: Move BOOT_VESA_SUPPORT from fbdev to x86 --- arch/x86/Kconfig | 6 ++++++ arch/x86/boot/video-vesa.c | 4 ++-- drivers/firmware/Kconfig | 1 + drivers/video/fbdev/Kconfig | 13 +++---------- 4 files changed, 12 insertions(+), 12 deletions(-)