From cda9edefa4e24117172da7c7bcbd71c8d866a42e Mon Sep 17 00:00:00 2001 From: Yifeng Li Date: Mon, 1 Apr 2019 17:46:59 +0200 Subject: [PATCH] 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 Tested-by: Sudip Mukherjee Cc: Teddy Wang Cc: # v4.4+ Signed-off-by: Bartlomiej Zolnierkiewicz Signed-off-by: Greg Kroah-Hartman --- 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 b04906ef4b60..e2478fa4faec 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; -- 2.20.1