diff options
| author | Anitha Chrisanthus <anitha.chrisanthus@intel.com> | 2020-12-15 22:13:09 +0300 |
|---|---|---|
| committer | Maarten Lankhorst <maarten.lankhorst@linux.intel.com> | 2021-10-21 12:08:08 +0300 |
| commit | 3e4c31e8f70251732529a10934355084c7fab0ac (patch) | |
| tree | f4e42e144e3d3c47e1b5553ad8021bd84020a50b /drivers/gpu/drm/kmb/kmb_dsi.c | |
| parent | 772970620a839141835eaf2bc507d957b10adcca (diff) | |
| download | linux-3e4c31e8f70251732529a10934355084c7fab0ac.tar.xz | |
drm/kmb: Work around for higher system clock
Use a different value for system clock offset in the
ppl/llp ratio calculations for clocks higher than 500 Mhz.
Fixes: 98521f4d4b4c ("drm/kmb: Mipi DSI part of the display driver")
Signed-off-by: Anitha Chrisanthus <anitha.chrisanthus@intel.com>
Acked-by: Sam Ravnborg <sam@ravnborg.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20211013233632.471892-1-anitha.chrisanthus@intel.com
Signed-off-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Diffstat (limited to 'drivers/gpu/drm/kmb/kmb_dsi.c')
| -rw-r--r-- | drivers/gpu/drm/kmb/kmb_dsi.c | 11 |
1 files changed, 10 insertions, 1 deletions
diff --git a/drivers/gpu/drm/kmb/kmb_dsi.c b/drivers/gpu/drm/kmb/kmb_dsi.c index 1793cd31b117..86e8e7943e89 100644 --- a/drivers/gpu/drm/kmb/kmb_dsi.c +++ b/drivers/gpu/drm/kmb/kmb_dsi.c @@ -482,6 +482,10 @@ static u32 mipi_tx_fg_section_cfg(struct kmb_dsi *kmb_dsi, return 0; } +#define CLK_DIFF_LOW 50 +#define CLK_DIFF_HI 60 +#define SYSCLK_500 500 + static void mipi_tx_fg_cfg_regs(struct kmb_dsi *kmb_dsi, u8 frame_gen, struct mipi_tx_frame_timing_cfg *fg_cfg) { @@ -492,7 +496,12 @@ static void mipi_tx_fg_cfg_regs(struct kmb_dsi *kmb_dsi, u8 frame_gen, /* 500 Mhz system clock minus 50 to account for the difference in * MIPI clock speed in RTL tests */ - sysclk = kmb_dsi->sys_clk_mhz - 50; + if (kmb_dsi->sys_clk_mhz == SYSCLK_500) { + sysclk = kmb_dsi->sys_clk_mhz - CLK_DIFF_LOW; + } else { + /* 700 Mhz clk*/ + sysclk = kmb_dsi->sys_clk_mhz - CLK_DIFF_HI; + } /* PPL-Pixel Packing Layer, LLP-Low Level Protocol * Frame genartor timing parameters are clocked on the system clock, |