From: Ard Biesheuvel <ard.biesheuvel@linaro.org>
To: Hans de Goede <hdegoede@redhat.com>
Cc: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>,
dri-devel <dri-devel@lists.freedesktop.org>,
Peter Jones <pjones@redhat.com>,
linux-efi <linux-efi@vger.kernel.org>,
"open list:EFIFB FRAMEBUFFER DRIVER"
<linux-fbdev@vger.kernel.org>
Subject: Re: [PATCH] efifb: BGRT: Add check for new BGRT status field rotation bits
Date: Mon, 10 Jun 2019 17:12:37 +0200 [thread overview]
Message-ID: <CAKv+Gu8bLcDROFNFfqHaN1Z+EK5bnXMNDSJbBK-pCmq5XP_kBw@mail.gmail.com> (raw)
In-Reply-To: <20190529154635.2659-1-hdegoede@redhat.com>
On Wed, 29 May 2019 at 17:46, Hans de Goede <hdegoede@redhat.com> wrote:
>
> Starting with ACPI 6.2 bits 1 and 2 of the BGRT status field are no longer
> reserved. These bits are now used to indicate if the image needs to be
> rotated before being displayed.
>
> The efifb code does not support rotating the image before copying it to
> the screen.
>
> This commit adds a check for these new bits and if they are set leaves the
> fb contents as is instead of trying to use the un-rotated BGRT image.
>
> Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Acked-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
> ---
> drivers/video/fbdev/efifb.c | 5 +++++
> 1 file changed, 5 insertions(+)
>
> diff --git a/drivers/video/fbdev/efifb.c b/drivers/video/fbdev/efifb.c
> index 9f39f0c360e0..dfa8dd47d19d 100644
> --- a/drivers/video/fbdev/efifb.c
> +++ b/drivers/video/fbdev/efifb.c
> @@ -169,6 +169,11 @@ static void efifb_show_boot_graphics(struct fb_info *info)
> return;
> }
>
> + if (bgrt_tab.status & 0x06) {
> + pr_info("efifb: BGRT rotation bits set, not showing boot graphics\n");
> + return;
> + }
> +
> /* Avoid flashing the logo if we're going to print std probe messages */
> if (console_loglevel > CONSOLE_LOGLEVEL_QUIET)
> return;
> --
> 2.21.0
>
next prev parent reply other threads:[~2019-06-10 15:12 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-05-29 15:46 [PATCH] efifb: BGRT: Add check for new BGRT status field rotation bits Hans de Goede
2019-06-10 15:12 ` Ard Biesheuvel [this message]
2019-06-11 14:04 ` Ard Biesheuvel
2019-06-11 14:24 ` Hans de Goede
2019-06-11 14:37 ` Ard Biesheuvel
2019-06-11 15:04 ` Hans de Goede
2019-06-21 11:38 ` Bartlomiej Zolnierkiewicz
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