Messages in this thread Patch in this message | | | From | Greg Kroah-Hartman <> | Subject | [PATCH 3.4 15/44] drm/vmwgfx: Fix incorrect write to read-only register v2: | Date | Mon, 7 Jul 2014 17:07:05 -0700 |
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3.4-stable review patch. If anyone has any objections, please let me know.
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From: Thomas Hellstrom <thellstrom@vmware.com>
commit 4e578080ed3262ed2c3985868539bc66218d25c0 upstream.
Commit "drm/vmwgfx: correct fb_fix_screeninfo.line_length", while fixing a vmwgfx fbdev bug, also writes the pitch to a supposedly read-only register: SVGA_REG_BYTES_PER_LINE, while it should be (and also in fact is) written to SVGA_REG_PITCHLOCK.
This patch is Cc'd stable because of the unknown effects writing to this register might have, particularly on older device versions.
v2: Updated log message.
Cc: Christopher Friedt <chrisfriedt@gmail.com> Tested-by: Christopher Friedt <chrisfriedt@gmail.com> Signed-off-by: Thomas Hellstrom <thellstrom@vmware.com> Reviewed-by: Jakob Bornecrantz <jakob@vmware.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
--- drivers/gpu/drm/vmwgfx/vmwgfx_fb.c | 1 - 1 file changed, 1 deletion(-)
--- a/drivers/gpu/drm/vmwgfx/vmwgfx_fb.c +++ b/drivers/gpu/drm/vmwgfx/vmwgfx_fb.c @@ -179,7 +179,6 @@ static int vmw_fb_set_par(struct fb_info vmw_write(vmw_priv, SVGA_REG_DISPLAY_POSITION_Y, info->var.yoffset); vmw_write(vmw_priv, SVGA_REG_DISPLAY_WIDTH, info->var.xres); vmw_write(vmw_priv, SVGA_REG_DISPLAY_HEIGHT, info->var.yres); - vmw_write(vmw_priv, SVGA_REG_BYTES_PER_LINE, info->fix.line_length); vmw_write(vmw_priv, SVGA_REG_DISPLAY_ID, SVGA_ID_INVALID); }
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