On Fri, Dec 28, 2018 at 04:13:07AM +0500, Ivan Mironov wrote:
SDL 1.2 sets all fields related to the pixel format to zero in some cases[1]. Prior to commit db05c48197759 ("drm: fb-helper: Reject all pixel format changing requests"), there was an unintentional workaround for this that existed for more than a decade. First in device-specific DRM drivers, then here in drm_fb_helper.c.
Previous code containing this workaround just ignores pixel format fields from userspace code. Not a good thing either, as this way, driver may silently use pixel format different from what client actually requested, and this in turn will lead to displaying garbage on the screen. I think that returning EINVAL to userspace in this particular case is the right option, so I decided to left code from problematic commit untouched instead of just reverting it entirely.
Here is the steps required to reproduce this problem exactly:
Compile fceux[2] with SDL 1.2.15 and without GTK or OpenGL support. SDL should be compiled with fbdev support (which is on by default).
Create /etc/fb.modes with following contents (values seems not used, and just required to trigger problematic code in SDL):
mode "test" geometry 1 1 1 1 1 timings 1 1 1 1 1 1 1 endmode
Create ~/.fceux/fceux.cfg with following contents:
SDL.Hotkeys.Quit = 27 SDL.DoubleBuffering = 1
Ensure that screen resolution is at least 1280x960 (e.g. append "video=Virtual-1:1280x960-32" to the kernel cmdline for qemu/QXL).
Try to run fceux on VT with some ROM file[3]:
# ./fceux color_test.nes
[1] SDL 1.2.15 source code, src/video/fbcon/SDL_fbvideo.c, FB_SetVideoMode() [2] http://www.fceux.com [3] Example ROM: https://github.com/bokuweb/rustynes/blob/master/roms/color_test.nes
Reported-by: saahriktu mail@saahriktu.org Suggested-by: saahriktu mail@saahriktu.org Cc: stable@vger.kernel.org Fixes: db05c48197759 ("drm: fb-helper: Reject all pixel format changing requests") Signed-off-by: Ivan Mironov mironov.ivan@gmail.com
drivers/gpu/drm/drm_fb_helper.c | 146 ++++++++++++++++++++------------ 1 file changed, 93 insertions(+), 53 deletions(-)
diff --git a/drivers/gpu/drm/drm_fb_helper.c b/drivers/gpu/drm/drm_fb_helper.c index d3af098b0922..aff576c3c4fb 100644 --- a/drivers/gpu/drm/drm_fb_helper.c +++ b/drivers/gpu/drm/drm_fb_helper.c @@ -1621,6 +1621,64 @@ static bool drm_fb_pixel_format_equal(const struct fb_var_screeninfo *var_1, var_1->transp.msb_right == var_2->transp.msb_right; } +static void drm_fb_helper_fill_pixel_fmt(struct fb_var_screeninfo *var,
u8 depth)
+{
- switch (depth) {
- case 8:
var->red.offset = 0;
var->green.offset = 0;
var->blue.offset = 0;
var->red.length = 8; /* 8bit DAC */
var->green.length = 8;
var->blue.length = 8;
var->transp.offset = 0;
var->transp.length = 0;
break;
- case 15:
var->red.offset = 10;
var->green.offset = 5;
var->blue.offset = 0;
var->red.length = 5;
var->green.length = 5;
var->blue.length = 5;
var->transp.offset = 15;
var->transp.length = 1;
break;
- case 16:
var->red.offset = 11;
var->green.offset = 5;
var->blue.offset = 0;
var->red.length = 5;
var->green.length = 6;
var->blue.length = 5;
var->transp.offset = 0;
break;
- case 24:
var->red.offset = 16;
var->green.offset = 8;
var->blue.offset = 0;
var->red.length = 8;
var->green.length = 8;
var->blue.length = 8;
var->transp.offset = 0;
var->transp.length = 0;
break;
- case 32:
var->red.offset = 16;
var->green.offset = 8;
var->blue.offset = 0;
var->red.length = 8;
var->green.length = 8;
var->blue.length = 8;
var->transp.offset = 24;
var->transp.length = 8;
break;
- default:
break;
- }
+}
/**
- drm_fb_helper_check_var - implementation for &fb_ops.fb_check_var
- @var: screeninfo to check
@@ -1654,6 +1712,40 @@ int drm_fb_helper_check_var(struct fb_var_screeninfo *var, return -EINVAL; }
- /*
* Workaround for SDL 1.2, which is known to be setting all pixel format
* fields values to zero in some cases. We treat this situation as a
* kind of "use some reasonable autodetected values".
*/
- if (!var->red.offset && !var->green.offset &&
!var->blue.offset && !var->transp.offset &&
!var->red.length && !var->green.length &&
!var->blue.length && !var->transp.length &&
!var->red.msb_right && !var->green.msb_right &&
!var->blue.msb_right && !var->transp.msb_right) {
u8 depth;
/*
* There is no way to guess the right value for depth when
* bpp is 16 or 32. So we just restore the behaviour previously
* introduced here by commit 785b93ef8c309. In fact, this was
* implemented even earlier in various device drivers.
*/
switch (var->bits_per_pixel) {
case 16:
depth = 15;
break;
case 32:
depth = 24;
break;
default:
depth = var->bits_per_pixel;
break;
}
drm_fb_helper_fill_pixel_fmt(var, depth);
Please use fb->format->depth here instead of guessing. -Daniel
- }
- /*
- drm fbdev emulation doesn't support changing the pixel format at all,
- so reject all pixel format changing requests.
@@ -1967,59 +2059,7 @@ void drm_fb_helper_fill_var(struct fb_info *info, struct drm_fb_helper *fb_helpe info->var.yoffset = 0; info->var.activate = FB_ACTIVATE_NOW;
- switch (fb->format->depth) {
- case 8:
info->var.red.offset = 0;
info->var.green.offset = 0;
info->var.blue.offset = 0;
info->var.red.length = 8; /* 8bit DAC */
info->var.green.length = 8;
info->var.blue.length = 8;
info->var.transp.offset = 0;
info->var.transp.length = 0;
break;
- case 15:
info->var.red.offset = 10;
info->var.green.offset = 5;
info->var.blue.offset = 0;
info->var.red.length = 5;
info->var.green.length = 5;
info->var.blue.length = 5;
info->var.transp.offset = 15;
info->var.transp.length = 1;
break;
- case 16:
info->var.red.offset = 11;
info->var.green.offset = 5;
info->var.blue.offset = 0;
info->var.red.length = 5;
info->var.green.length = 6;
info->var.blue.length = 5;
info->var.transp.offset = 0;
break;
- case 24:
info->var.red.offset = 16;
info->var.green.offset = 8;
info->var.blue.offset = 0;
info->var.red.length = 8;
info->var.green.length = 8;
info->var.blue.length = 8;
info->var.transp.offset = 0;
info->var.transp.length = 0;
break;
- case 32:
info->var.red.offset = 16;
info->var.green.offset = 8;
info->var.blue.offset = 0;
info->var.red.length = 8;
info->var.green.length = 8;
info->var.blue.length = 8;
info->var.transp.offset = 24;
info->var.transp.length = 8;
break;
- default:
break;
- }
- drm_fb_helper_fill_pixel_fmt(&info->var, fb->format->depth);
info->var.xres = fb_width; info->var.yres = fb_height; -- 2.20.1