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[RFC,26/32] drm: handle HAS_IOPORT dependencies

Message ID 20211227164317.4146918-27-schnelle@linux.ibm.com (mailing list archive)
State New, archived
Headers show
Series Kconfig: Introduce HAS_IOPORT and LEGACY_PCI options | expand

Commit Message

Niklas Schnelle Dec. 27, 2021, 4:43 p.m. UTC 
In a future patch HAS_IOPORT=n will result in inb()/outb() and friends
not being declared. We thus need to add HAS_IOPORT as dependency for
those drivers using them. There is also a direct and hard coded use in
cirrus.c which according to the comment is only necessary during resume.
Let's just skip this as for example s390 which doesn't have I/O port
support also doesen't support suspend/resume.

Co-developed-by: Arnd Bergmann <arnd@kernel.org>
Signed-off-by: Arnd Bergmann <arnd@kernel.org>
Signed-off-by: Niklas Schnelle <schnelle@linux.ibm.com>
---
 drivers/gpu/drm/qxl/Kconfig   | 1 +
 drivers/gpu/drm/tiny/Kconfig  | 1 +
 drivers/gpu/drm/tiny/cirrus.c | 2 ++
 3 files changed, 4 insertions(+)

Comments

Gerd Hoffmann Jan. 3, 2022, 6:11 a.m. UTC | #1 
On Mon, Dec 27, 2021 at 05:43:11PM +0100, Niklas Schnelle wrote:
> In a future patch HAS_IOPORT=n will result in inb()/outb() and friends
> not being declared. We thus need to add HAS_IOPORT as dependency for
> those drivers using them. There is also a direct and hard coded use in
> cirrus.c which according to the comment is only necessary during resume.
> Let's just skip this as for example s390 which doesn't have I/O port
> support also doesen't support suspend/resume.

>  config DRM_BOCHS
>  	tristate "DRM Support for bochs dispi vga interface (qemu stdvga)"
>  	depends on DRM && PCI && MMU
> +	depends on HAS_IOPORT
>  	select DRM_KMS_HELPER
>  	select DRM_VRAM_HELPER
>  	select DRM_TTM

On devices with an mmio bar the driver works just fine without inb/outb,
see bochs->mmio checks in bochs.c

take care,
  Gerd
diff mbox series

Patch

diff --git a/drivers/gpu/drm/qxl/Kconfig b/drivers/gpu/drm/qxl/Kconfig
index ca3f51c2a8fe..d0e0d440c8d9 100644
--- a/drivers/gpu/drm/qxl/Kconfig
+++ b/drivers/gpu/drm/qxl/Kconfig
@@ -2,6 +2,7 @@ 
 config DRM_QXL
 	tristate "QXL virtual GPU"
 	depends on DRM && PCI && MMU
+	depends on HAS_IOPORT
 	select DRM_KMS_HELPER
 	select DRM_TTM
 	select DRM_TTM_HELPER
diff --git a/drivers/gpu/drm/tiny/Kconfig b/drivers/gpu/drm/tiny/Kconfig
index 1ceb93fbdc50..81749943af13 100644
--- a/drivers/gpu/drm/tiny/Kconfig
+++ b/drivers/gpu/drm/tiny/Kconfig
@@ -13,6 +13,7 @@  config DRM_ARCPGU
 config DRM_BOCHS
 	tristate "DRM Support for bochs dispi vga interface (qemu stdvga)"
 	depends on DRM && PCI && MMU
+	depends on HAS_IOPORT
 	select DRM_KMS_HELPER
 	select DRM_VRAM_HELPER
 	select DRM_TTM
diff --git a/drivers/gpu/drm/tiny/cirrus.c b/drivers/gpu/drm/tiny/cirrus.c
index 4611ec408506..c9b6e9779d18 100644
--- a/drivers/gpu/drm/tiny/cirrus.c
+++ b/drivers/gpu/drm/tiny/cirrus.c
@@ -306,8 +306,10 @@  static int cirrus_mode_set(struct cirrus_device *cirrus,
 
 	cirrus_set_start_address(cirrus, 0);
 
+#ifdef CONFIG_HAS_IOPORT
 	/* Unblank (needed on S3 resume, vgabios doesn't do it then) */
 	outb(0x20, 0x3c0);
+#endif
 
 	drm_dev_exit(idx);
 	return 0;