Re: [PATCH v3 4/8] drm/simpledrm: Use struct iosys_map consistently

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



Hi

Am 17.11.22 um 19:40 schrieb Thierry Reding:
From: Thierry Reding <treding@xxxxxxxxxx>

The majority of the driver already uses struct iosys_map to encapsulate
accesses to I/O remapped vs. system memory. Accesses via the screen base
pointer still use __iomem annotations, which can lead to inconsistencies
and conflicts with subsequent patches.

Convert the screen base to a struct iosys_map as well for consistency
and to avoid these issues.

Signed-off-by: Thierry Reding <treding@xxxxxxxxxx>
---
Changes in v3:
- properly reinitialize struct iosys_map to avoid bogus increments

  drivers/gpu/drm/tiny/simpledrm.c | 15 ++++++++-------
  1 file changed, 8 insertions(+), 7 deletions(-)

diff --git a/drivers/gpu/drm/tiny/simpledrm.c b/drivers/gpu/drm/tiny/simpledrm.c
index 162eb44dcba8..3673a42e4bf4 100644
--- a/drivers/gpu/drm/tiny/simpledrm.c
+++ b/drivers/gpu/drm/tiny/simpledrm.c
@@ -208,7 +208,7 @@ struct simpledrm_device {
  	unsigned int pitch;
/* memory management */
-	void __iomem *screen_base;
+	struct iosys_map screen_base;
/* modesetting */
  	uint32_t formats[8];
@@ -492,15 +492,15 @@ static void simpledrm_primary_plane_helper_atomic_update(struct drm_plane *plane
drm_atomic_helper_damage_iter_init(&iter, old_plane_state, plane_state);
  	drm_atomic_for_each_plane_damage(&iter, &damage) {
-		struct iosys_map dst = IOSYS_MAP_INIT_VADDR(sdev->screen_base);

We use dst throughout the code for such destination buffers. Please keep the name. With this fixed, you can add

Reviewed-by: Thomas Zimmermann <tzimmermann@xxxxxxx>

to the patch.

Best regards
Thomas

  		struct drm_rect dst_clip = plane_state->dst;
+		struct iosys_map screen = sdev->screen_base;
if (!drm_rect_intersect(&dst_clip, &damage))
  			continue;
- iosys_map_incr(&dst, drm_fb_clip_offset(sdev->pitch, sdev->format, &dst_clip));
-		drm_fb_blit(&dst, &sdev->pitch, sdev->format->format, shadow_plane_state->data, fb,
-			    &damage);
+		iosys_map_incr(&screen, drm_fb_clip_offset(sdev->pitch, sdev->format, &dst_clip));
+		drm_fb_blit(&screen, &sdev->pitch, sdev->format->format, shadow_plane_state->data,
+			    fb, &damage);
  	}
drm_dev_exit(idx);
@@ -519,7 +519,7 @@ static void simpledrm_primary_plane_helper_atomic_disable(struct drm_plane *plan
  		return;
/* Clear screen to black if disabled */
-	memset_io(sdev->screen_base, 0, sdev->pitch * sdev->mode.vdisplay);
+	iosys_map_memset(&sdev->screen_base, 0, 0, sdev->pitch * sdev->mode.vdisplay);
drm_dev_exit(idx);
  }
@@ -722,7 +722,8 @@ static struct simpledrm_device *simpledrm_device_create(struct drm_driver *drv,
  	screen_base = devm_ioremap_wc(&pdev->dev, mem->start, resource_size(mem));
  	if (!screen_base)
  		return ERR_PTR(-ENOMEM);
-	sdev->screen_base = screen_base;
+
+	iosys_map_set_vaddr_iomem(&sdev->screen_base, screen_base);
/*
  	 * Modesetting

--
Thomas Zimmermann
Graphics Driver Developer
SUSE Software Solutions Germany GmbH
Maxfeldstr. 5, 90409 Nürnberg, Germany
(HRB 36809, AG Nürnberg)
Geschäftsführer: Ivo Totev

Attachment: OpenPGP_signature
Description: OpenPGP digital signature


[Index of Archives]     [ARM Kernel]     [Linux ARM]     [Linux ARM MSM]     [Linux USB Devel]     [Video for Linux]     [Linux Audio Users]     [Yosemite News]     [Linux Kernel]     [Linux SCSI]

  Powered by Linux