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authorYifeng Li <tomli@tomli.me>2019-04-01 17:46:59 +0200
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2019-05-25 18:23:36 +0200
commit2cf1dce1bfa59392f004cab6e2cb361c3344938a (patch)
tree9be8822fa8cd0a56bc8b585348a8657a3e56cdb0
parent27968d8213684122e096d8305076ff41fa3a352c (diff)
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fbdev: sm712fb: fix crashes and garbled display during DPMS modesetting
commit f627caf55b8e735dcec8fa6538e9668632b55276 upstream. 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: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
-rw-r--r--drivers/video/fbdev/sm712fb.c64
1 files changed, 38 insertions, 26 deletions
diff --git a/drivers/video/fbdev/sm712fb.c b/drivers/video/fbdev/sm712fb.c
index 0d03ea09849f..1e2503b52c6f 100644
--- a/drivers/video/fbdev/sm712fb.c
+++ b/drivers/video/fbdev/sm712fb.c
@@ -886,67 +886,79 @@ 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;