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| author | Marek Vasut <marex@denx.de> | 2022-04-30 00:23:13 +0300 |
|---|---|---|
| committer | Marek Vasut <marex@denx.de> | 2022-05-05 02:03:49 +0300 |
| commit | 05ecc678357ae0929835b24f40a9ea8a1fcb105a (patch) | |
| tree | 5b077e858be06f2fbfb5993ce10d63bce73acac2 /drivers/gpu/drm/mxsfb/mxsfb_regs.h | |
| parent | c81474ee890670eb942934e5ddc9366e6ec7f381 (diff) | |
| download | linux-05ecc678357ae0929835b24f40a9ea8a1fcb105a.tar.xz | |
drm: mxsfb: Implement LCDIF scanout CRC32 support
The LCDIF controller as present in i.MX28/i.MX6SX/i.MX8M Mini/Nano has
CRC_STAT register, which contains CRC32 of the frame as it was clocked
out of the DPI interface of the LCDIF. This is most likely meant as a
functional safety feature.
Unfortunately, there is zero documentation on how the CRC32 is calculated,
there is no documentation of the polynomial, the init value, nor on which
data is the checksum applied.
By applying brute-force on 8 pixel / 2 line frame, which is the minimum
size LCDIF would work with, it turns out the polynomial is CRC32_POLY_LE
0xedb88320 , init value is 0xffffffff , the input data are bitrev32()
of the entire frame and the resulting CRC has to be also bitrev32()ed.
Doing this calculation in kernel for each frame is unrealistic due to the
CPU demand, so attach the CRC collected from hardware to a frame instead.
The DRM subsystem already has an interface for this purpose and the CRC
can be accessed e.g. via debugfs:
"
$ echo auto > /sys/kernel/debug/dri/1/crtc-0/crc/control
$ cat /sys/kernel/debug/dri/1/crtc-0/crc/data
0x0000408c 0xa4e5cdd8
0x0000408d 0x72f537b4
"
The per-frame CRC can be used by userspace e.g. during automated testing,
to verify that whatever buffer was sent to be scanned out was actually
scanned out of the LCDIF correctly.
Acked-by: Lucas Stach <l.stach@pengutronix.de>
Acked-by: Stefan Agner <stefan@agner.ch>
Signed-off-by: Marek Vasut <marex@denx.de>
Cc: Alexander Stein <alexander.stein@ew.tq-group.com>
Cc: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Cc: Lucas Stach <l.stach@pengutronix.de>
Cc: Peng Fan <peng.fan@nxp.com>
Cc: Robby Cai <robby.cai@nxp.com>
Cc: Sam Ravnborg <sam@ravnborg.org>
Cc: Stefan Agner <stefan@agner.ch>
Link: https://patchwork.freedesktop.org/patch/msgid/20220429212313.305556-1-marex@denx.de
Diffstat (limited to 'drivers/gpu/drm/mxsfb/mxsfb_regs.h')
| -rw-r--r-- | drivers/gpu/drm/mxsfb/mxsfb_regs.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/drivers/gpu/drm/mxsfb/mxsfb_regs.h b/drivers/gpu/drm/mxsfb/mxsfb_regs.h index 694fea13e893..cf813a1da1d7 100644 --- a/drivers/gpu/drm/mxsfb/mxsfb_regs.h +++ b/drivers/gpu/drm/mxsfb/mxsfb_regs.h @@ -26,6 +26,7 @@ #define LCDC_VDCTRL2 0x90 #define LCDC_VDCTRL3 0xa0 #define LCDC_VDCTRL4 0xb0 +#define LCDC_V4_CRC_STAT 0x1a0 #define LCDC_V4_DEBUG0 0x1d0 #define LCDC_V3_DEBUG0 0x1f0 #define LCDC_AS_CTRL 0x210 |