From: Sasha Levin <sashal@kernel.org>
To: linux-kernel@vger.kernel.org, stable@vger.kernel.org
Cc: Sasha Levin <sashal@kernel.org>,
linux-fbdev@vger.kernel.org,
Teddy Wang <teddy.wang@siliconmotion.com>,
Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>,
dri-devel@lists.freedesktop.org, Yifeng Li <tomli@tomli.me>,
Sudip Mukherjee <sudipm.mukherjee@gmail.com>
Subject: [PATCH AUTOSEL 4.4 41/56] fbdev: sm712fb: fix crashes and garbled display during DPMS modesetting
Date: Sat, 01 Jun 2019 13:25:45 +0000 [thread overview]
Message-ID: <20190601132600.27427-41-sashal@kernel.org> (raw)
In-Reply-To: <20190601132600.27427-1-sashal@kernel.org>
From: Yifeng Li <tomli@tomli.me>
[ Upstream commit f627caf55b8e735dcec8fa6538e9668632b55276 ]
On a Thinkpad s30 (Pentium III / i440MX, Lynx3DM), blanking the display
or starting the X server will crash and freeze the system, or garble the
display.
Experiments showed this problem can mostly be solved by adjusting the
order of register writes. Also, sm712fb failed to consider the difference
of clock frequency when unblanking the display, and programs the clock for
SM712 to SM720.
Fix them by adjusting the order of register writes, and adding an
additional check for SM720 for programming the clock frequency.
Signed-off-by: Yifeng Li <tomli@tomli.me>
Tested-by: Sudip Mukherjee <sudipm.mukherjee@gmail.com>
Cc: Teddy Wang <teddy.wang@siliconmotion.com>
Cc: <stable@vger.kernel.org> # v4.4+
Signed-off-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/video/fbdev/sm712fb.c | 64 +++++++++++++++++++++--------------
1 file changed, 38 insertions(+), 26 deletions(-)
diff --git a/drivers/video/fbdev/sm712fb.c b/drivers/video/fbdev/sm712fb.c
index 86ae1d4556fc1..2539c1e6facb4 100644
--- a/drivers/video/fbdev/sm712fb.c
+++ b/drivers/video/fbdev/sm712fb.c
@@ -827,67 +827,79 @@ static inline unsigned int chan_to_field(unsigned int chan,
static int smtc_blank(int blank_mode, struct fb_info *info)
{
+ struct smtcfb_info *sfb = info->par;
+
/* clear DPMS setting */
switch (blank_mode) {
case FB_BLANK_UNBLANK:
/* Screen On: HSync: On, VSync : On */
+
+ switch (sfb->chip_id) {
+ case 0x710:
+ case 0x712:
+ smtc_seqw(0x6a, 0x16);
+ smtc_seqw(0x6b, 0x02);
+ case 0x720:
+ smtc_seqw(0x6a, 0x0d);
+ smtc_seqw(0x6b, 0x02);
+ break;
+ }
+
+ smtc_seqw(0x23, (smtc_seqr(0x23) & (~0xc0)));
smtc_seqw(0x01, (smtc_seqr(0x01) & (~0x20)));
- smtc_seqw(0x6a, 0x16);
- smtc_seqw(0x6b, 0x02);
smtc_seqw(0x21, (smtc_seqr(0x21) & 0x77));
smtc_seqw(0x22, (smtc_seqr(0x22) & (~0x30)));
- smtc_seqw(0x23, (smtc_seqr(0x23) & (~0xc0)));
- smtc_seqw(0x24, (smtc_seqr(0x24) | 0x01));
smtc_seqw(0x31, (smtc_seqr(0x31) | 0x03));
+ smtc_seqw(0x24, (smtc_seqr(0x24) | 0x01));
break;
case FB_BLANK_NORMAL:
/* Screen Off: HSync: On, VSync : On Soft blank */
+ smtc_seqw(0x24, (smtc_seqr(0x24) | 0x01));
+ smtc_seqw(0x31, ((smtc_seqr(0x31) & (~0x07)) | 0x00));
+ smtc_seqw(0x23, (smtc_seqr(0x23) & (~0xc0)));
smtc_seqw(0x01, (smtc_seqr(0x01) & (~0x20)));
+ smtc_seqw(0x22, (smtc_seqr(0x22) & (~0x30)));
smtc_seqw(0x6a, 0x16);
smtc_seqw(0x6b, 0x02);
- smtc_seqw(0x22, (smtc_seqr(0x22) & (~0x30)));
- smtc_seqw(0x23, (smtc_seqr(0x23) & (~0xc0)));
- smtc_seqw(0x24, (smtc_seqr(0x24) | 0x01));
- smtc_seqw(0x31, ((smtc_seqr(0x31) & (~0x07)) | 0x00));
break;
case FB_BLANK_VSYNC_SUSPEND:
/* Screen On: HSync: On, VSync : Off */
+ smtc_seqw(0x24, (smtc_seqr(0x24) & (~0x01)));
+ smtc_seqw(0x31, ((smtc_seqr(0x31) & (~0x07)) | 0x00));
+ smtc_seqw(0x23, ((smtc_seqr(0x23) & (~0xc0)) | 0x20));
smtc_seqw(0x01, (smtc_seqr(0x01) | 0x20));
- smtc_seqw(0x20, (smtc_seqr(0x20) & (~0xB0)));
- smtc_seqw(0x6a, 0x0c);
- smtc_seqw(0x6b, 0x02);
smtc_seqw(0x21, (smtc_seqr(0x21) | 0x88));
+ smtc_seqw(0x20, (smtc_seqr(0x20) & (~0xB0)));
smtc_seqw(0x22, ((smtc_seqr(0x22) & (~0x30)) | 0x20));
- smtc_seqw(0x23, ((smtc_seqr(0x23) & (~0xc0)) | 0x20));
- smtc_seqw(0x24, (smtc_seqr(0x24) & (~0x01)));
- smtc_seqw(0x31, ((smtc_seqr(0x31) & (~0x07)) | 0x00));
smtc_seqw(0x34, (smtc_seqr(0x34) | 0x80));
+ smtc_seqw(0x6a, 0x0c);
+ smtc_seqw(0x6b, 0x02);
break;
case FB_BLANK_HSYNC_SUSPEND:
/* Screen On: HSync: Off, VSync : On */
+ smtc_seqw(0x24, (smtc_seqr(0x24) & (~0x01)));
+ smtc_seqw(0x31, ((smtc_seqr(0x31) & (~0x07)) | 0x00));
+ smtc_seqw(0x23, ((smtc_seqr(0x23) & (~0xc0)) | 0xD8));
smtc_seqw(0x01, (smtc_seqr(0x01) | 0x20));
- smtc_seqw(0x20, (smtc_seqr(0x20) & (~0xB0)));
- smtc_seqw(0x6a, 0x0c);
- smtc_seqw(0x6b, 0x02);
smtc_seqw(0x21, (smtc_seqr(0x21) | 0x88));
+ smtc_seqw(0x20, (smtc_seqr(0x20) & (~0xB0)));
smtc_seqw(0x22, ((smtc_seqr(0x22) & (~0x30)) | 0x10));
- smtc_seqw(0x23, ((smtc_seqr(0x23) & (~0xc0)) | 0xD8));
- smtc_seqw(0x24, (smtc_seqr(0x24) & (~0x01)));
- smtc_seqw(0x31, ((smtc_seqr(0x31) & (~0x07)) | 0x00));
smtc_seqw(0x34, (smtc_seqr(0x34) | 0x80));
+ smtc_seqw(0x6a, 0x0c);
+ smtc_seqw(0x6b, 0x02);
break;
case FB_BLANK_POWERDOWN:
/* Screen On: HSync: Off, VSync : Off */
+ smtc_seqw(0x24, (smtc_seqr(0x24) & (~0x01)));
+ smtc_seqw(0x31, ((smtc_seqr(0x31) & (~0x07)) | 0x00));
+ smtc_seqw(0x23, ((smtc_seqr(0x23) & (~0xc0)) | 0xD8));
smtc_seqw(0x01, (smtc_seqr(0x01) | 0x20));
- smtc_seqw(0x20, (smtc_seqr(0x20) & (~0xB0)));
- smtc_seqw(0x6a, 0x0c);
- smtc_seqw(0x6b, 0x02);
smtc_seqw(0x21, (smtc_seqr(0x21) | 0x88));
+ smtc_seqw(0x20, (smtc_seqr(0x20) & (~0xB0)));
smtc_seqw(0x22, ((smtc_seqr(0x22) & (~0x30)) | 0x30));
- smtc_seqw(0x23, ((smtc_seqr(0x23) & (~0xc0)) | 0xD8));
- smtc_seqw(0x24, (smtc_seqr(0x24) & (~0x01)));
- smtc_seqw(0x31, ((smtc_seqr(0x31) & (~0x07)) | 0x00));
smtc_seqw(0x34, (smtc_seqr(0x34) | 0x80));
+ smtc_seqw(0x6a, 0x0c);
+ smtc_seqw(0x6b, 0x02);
break;
default:
return -EINVAL;
--
2.20.1
next prev parent reply other threads:[~2019-06-01 13:25 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <20190601132600.27427-1-sashal@kernel.org>
2019-06-01 13:25 ` [PATCH AUTOSEL 4.4 33/56] fbdev: fix WARNING in __alloc_pages_nodemask bug Sasha Levin
2019-06-01 13:25 ` Sasha Levin [this message]
2019-06-01 13:25 ` [PATCH AUTOSEL 4.4 42/56] fbdev: sm712fb: fix boot screen glitch when sm712fb replaces VGA Sasha Levin
2019-06-01 13:25 ` [PATCH AUTOSEL 4.4 43/56] video: hgafb: fix potential NULL pointer dereference Sasha Levin
2019-06-01 13:25 ` [PATCH AUTOSEL 4.4 44/56] video: imsttfb: fix potential NULL pointer dereferences Sasha Levin
2019-06-01 16:19 ` Greg Kroah-Hartman
2019-06-01 23:53 ` Finn Thain
2019-06-02 14:11 ` Sasha Levin
2019-06-01 13:25 ` [PATCH AUTOSEL 4.4 45/56] fbdev: sm712fb: fix brightness control on reboot, don't set SR30 Sasha Levin
2019-06-01 13:25 ` [PATCH AUTOSEL 4.4 46/56] fbdev: fix divide error in fb_var_to_videomode Sasha Levin
2019-06-01 13:25 ` [PATCH AUTOSEL 4.4 47/56] fbdev: sm712fb: fix white screen of death on reboot, don't set CR3B-CR3F Sasha Levin
2019-06-01 13:25 ` [PATCH AUTOSEL 4.4 48/56] fbdev: sm712fb: fix crashes during framebuffer writes by correctly mapping Sasha Levin
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