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Date: Sun, 09 Dec 2018 21:50:33 +0000 From: Ben Hutchings <ben@...adent.org.uk> To: linux-kernel@...r.kernel.org, stable@...r.kernel.org CC: akpm@...ux-foundation.org, "Daniel Vetter" <daniel.vetter@...ll.ch>, "Ville Syrjälä" <ville.syrjala@...ux.intel.com>, "Eugeniy Paltsev" <Eugeniy.Paltsev@...opsys.com> Subject: [PATCH 3.16 292/328] drm: fb-helper: Reject all pixel format changing requests 3.16.62-rc1 review patch. If anyone has any objections, please let me know. ------------------ From: Eugeniy Paltsev <Eugeniy.Paltsev@...opsys.com> commit db05c481977599236f12a85e55de9f5ab37b0a2c upstream. drm fbdev emulation doesn't support changing the pixel format at all, so reject all pixel format changing requests. Signed-off-by: Eugeniy Paltsev <Eugeniy.Paltsev@...opsys.com> Reviewed-by: Ville Syrjälä <ville.syrjala@...ux.intel.com> Signed-off-by: Daniel Vetter <daniel.vetter@...ll.ch> Link: https://patchwork.freedesktop.org/patch/msgid/20181003164538.5534-1-Eugeniy.Paltsev@synopsys.com Signed-off-by: Ben Hutchings <ben@...adent.org.uk> --- drivers/gpu/drm/drm_fb_helper.c | 91 ++++++++++----------------------- 1 file changed, 26 insertions(+), 65 deletions(-) --- a/drivers/gpu/drm/drm_fb_helper.c +++ b/drivers/gpu/drm/drm_fb_helper.c @@ -750,6 +750,25 @@ int drm_fb_helper_setcmap(struct fb_cmap } EXPORT_SYMBOL(drm_fb_helper_setcmap); +static bool drm_fb_pixel_format_equal(const struct fb_var_screeninfo *var_1, + const struct fb_var_screeninfo *var_2) +{ + return var_1->bits_per_pixel == var_2->bits_per_pixel && + var_1->grayscale == var_2->grayscale && + var_1->red.offset == var_2->red.offset && + var_1->red.length == var_2->red.length && + var_1->red.msb_right == var_2->red.msb_right && + var_1->green.offset == var_2->green.offset && + var_1->green.length == var_2->green.length && + var_1->green.msb_right == var_2->green.msb_right && + var_1->blue.offset == var_2->blue.offset && + var_1->blue.length == var_2->blue.length && + var_1->blue.msb_right == var_2->blue.msb_right && + var_1->transp.offset == var_2->transp.offset && + var_1->transp.length == var_2->transp.length && + var_1->transp.msb_right == var_2->transp.msb_right; +} + /** * drm_fb_helper_check_var - implementation for ->fb_check_var * @var: screeninfo to check @@ -760,7 +779,6 @@ int drm_fb_helper_check_var(struct fb_va { struct drm_fb_helper *fb_helper = info->par; struct drm_framebuffer *fb = fb_helper->fb; - int depth; if (var->pixclock != 0 || in_dbg_master()) return -EINVAL; @@ -777,72 +795,15 @@ int drm_fb_helper_check_var(struct fb_va return -EINVAL; } - switch (var->bits_per_pixel) { - case 16: - depth = (var->green.length == 6) ? 16 : 15; - break; - case 32: - depth = (var->transp.length > 0) ? 32 : 24; - break; - default: - depth = var->bits_per_pixel; - break; - } - - switch (depth) { - case 8: - var->red.offset = 0; - var->green.offset = 0; - var->blue.offset = 0; - var->red.length = 8; - var->green.length = 8; - var->blue.length = 8; - var->transp.length = 0; - var->transp.offset = 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.length = 1; - var->transp.offset = 15; - 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.length = 0; - 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.length = 0; - var->transp.offset = 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.length = 8; - var->transp.offset = 24; - break; - default: + /* + * drm fbdev emulation doesn't support changing the pixel format at all, + * so reject all pixel format changing requests. + */ + if (!drm_fb_pixel_format_equal(var, &info->var)) { + DRM_DEBUG("fbdev emulation doesn't support changing the pixel format\n"); return -EINVAL; } + return 0; } EXPORT_SYMBOL(drm_fb_helper_check_var);
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