On 4/29/22 16:08, Stefan Agner wrote:
On 2022-04-11 22:35, Marek Vasut wrote:
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.
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
V2: Check crtc for non-NULL before dereferencing it in mxsfb_crtc_set_crc_source
drivers/gpu/drm/mxsfb/mxsfb_drv.c | 15 +++++++- drivers/gpu/drm/mxsfb/mxsfb_drv.h | 3 ++ drivers/gpu/drm/mxsfb/mxsfb_kms.c | 61 ++++++++++++++++++++++++++++-- drivers/gpu/drm/mxsfb/mxsfb_regs.h | 1 + 4 files changed, 75 insertions(+), 5 deletions(-)
diff --git a/drivers/gpu/drm/mxsfb/mxsfb_drv.c b/drivers/gpu/drm/mxsfb/mxsfb_drv.c index 94cafff7f68d5..ccf4107476ecc 100644 --- a/drivers/gpu/drm/mxsfb/mxsfb_drv.c +++ b/drivers/gpu/drm/mxsfb/mxsfb_drv.c @@ -9,6 +9,7 @@ */
#include <linux/clk.h> +#include <linux/crc32.h>
Doesn't look like this is used?
Doh, testing remnant, dropped, thanks.