Contributors: 5
| Author |
Tokens |
Token Proportion |
Commits |
Commit Proportion |
| Dave Airlie |
144 |
49.32% |
1 |
9.09% |
| Thomas Zimmermann |
105 |
35.96% |
7 |
63.64% |
| Jacob E Keller |
39 |
13.36% |
1 |
9.09% |
| Daniel Vetter |
3 |
1.03% |
1 |
9.09% |
| Thomas Gleixner |
1 |
0.34% |
1 |
9.09% |
| Total |
292 |
|
11 |
|
// SPDX-License-Identifier: GPL-2.0-only
#include <linux/delay.h>
#include <linux/iopoll.h>
#include <drm/drm_atomic_helper.h>
#include <drm/drm_edid.h>
#include <drm/drm_managed.h>
#include <drm/drm_probe_helper.h>
#include "mgag200_drv.h"
void mgag200_bmc_stop_scanout(struct mga_device *mdev)
{
u8 tmp;
int ret;
/*
* 1 - The first step is to inform the BMC of an upcoming mode
* change. We are putting the misc<0> to output.
*/
WREG8(DAC_INDEX, MGA1064_GEN_IO_CTL);
tmp = RREG8(DAC_DATA);
tmp |= 0x10;
WREG_DAC(MGA1064_GEN_IO_CTL, tmp);
/* we are putting a 1 on the misc<0> line */
WREG8(DAC_INDEX, MGA1064_GEN_IO_DATA);
tmp = RREG8(DAC_DATA);
tmp |= 0x10;
WREG_DAC(MGA1064_GEN_IO_DATA, tmp);
/*
* 2- Second step to mask any further scan request. This is
* done by asserting the remfreqmsk bit (XSPAREREG<7>)
*/
WREG8(DAC_INDEX, MGA1064_SPAREREG);
tmp = RREG8(DAC_DATA);
tmp |= 0x80;
WREG_DAC(MGA1064_SPAREREG, tmp);
/*
* 3a- The third step is to verify if there is an active scan.
* We are waiting for a 0 on remhsyncsts (<XSPAREREG<0>).
*/
ret = read_poll_timeout(RREG_DAC, tmp, !(tmp & 0x1),
1000, 300000, false,
MGA1064_SPAREREG);
if (ret == -ETIMEDOUT)
return;
/*
* 3b- This step occurs only if the remote BMC is actually
* scanning. We are waiting for the end of the frame which is
* a 1 on remvsyncsts (XSPAREREG<1>)
*/
(void)read_poll_timeout(RREG_DAC, tmp, (tmp & 0x2),
1000, 300000, false,
MGA1064_SPAREREG);
}
void mgag200_bmc_start_scanout(struct mga_device *mdev)
{
u8 tmp;
/* Assert rstlvl2 */
WREG8(DAC_INDEX, MGA1064_REMHEADCTL2);
tmp = RREG8(DAC_DATA);
tmp |= 0x8;
WREG8(DAC_DATA, tmp);
udelay(10);
/* Deassert rstlvl2 */
tmp &= ~0x08;
WREG8(DAC_INDEX, MGA1064_REMHEADCTL2);
WREG8(DAC_DATA, tmp);
/* Remove mask of scan request */
WREG8(DAC_INDEX, MGA1064_SPAREREG);
tmp = RREG8(DAC_DATA);
tmp &= ~0x80;
WREG8(DAC_DATA, tmp);
/* Put back a 0 on the misc<0> line */
WREG8(DAC_INDEX, MGA1064_GEN_IO_DATA);
tmp = RREG8(DAC_DATA);
tmp &= ~0x10;
WREG_DAC(MGA1064_GEN_IO_DATA, tmp);
}