Re: [PATCH] drm/panel-simple: Fix dotclock for Ortustech COM37H3M
Hi Nikolaus
Thanks for the detailed explanation.
Applied and pushed to drm-misc-next.
Sam
On Tue, Mar 10, 2020 at 08:43:19AM +0100, H. Nikolaus Schaller wrote:
> The currently listed dotclock disagrees with the currently
> listed vrefresh rate. Change the dotclock to match the vrefresh.
>
> There are two variants of the COM37H3M panel.
> The older one's COM37H3M05DTC data sheet specifies:
>
> MIN TYP MAX
> CLK frequencyfCLK -- 22.426.3 MHz (in VGA mode)
> VSYNC Frequency fVSYNC 54 60 66 Hz
> VSYNC cycle time tv -- 650 -- H
> HSYNC frequency fHSYNC -- 39.3-- kHz
> HSYNC cycle time th -- 570 -- CLK
>
> The newer one's COM37H3M99DTC data sheet says:
>
> MIN TYP MAX
> CLK frequencyfCLK 18 19.827 MHz
> VSYNC Frequency fVSYNC 54 60 66 Hz
> VSYNC cycle time tv 646 650 700 H
> HSYNC frequency fHSYNC --39.050.0 kHz
> HSYNC cycle time th 504 508 630 CLK
>
> So we choose a parameter set that lies within the specs
> of both variants. We start at .vrefresh = 60,
> choose .htotal = 570 and .vtotal = 650 and end up
> in a clock of 22.230 MHz.
>
> Reported-by: Ville Syrjala
> Signed-off-by: H. Nikolaus Schaller
> ---
> drivers/gpu/drm/panel/panel-simple.c | 12 ++--
> 1 file changed, 6 insertions(+), 6 deletions(-)
>
> diff --git a/drivers/gpu/drm/panel/panel-simple.c
> b/drivers/gpu/drm/panel/panel-simple.c
> index e14c14ac62b5..b4cb23d4898d 100644
> --- a/drivers/gpu/drm/panel/panel-simple.c
> +++ b/drivers/gpu/drm/panel/panel-simple.c
> @@ -2390,15 +2390,15 @@ static const struct panel_desc ontat_yx700wv03 = {
> };
>
> static const struct drm_display_mode ortustech_com37h3m_mode = {
> - .clock = 22153,
> + .clock = 22230,
> .hdisplay = 480,
> - .hsync_start = 480 + 8,
> - .hsync_end = 480 + 8 + 10,
> - .htotal = 480 + 8 + 10 + 10,
> + .hsync_start = 480 + 40,
> + .hsync_end = 480 + 40 + 10,
> + .htotal = 480 + 40 + 10 + 40,
> .vdisplay = 640,
> .vsync_start = 640 + 4,
> - .vsync_end = 640 + 4 + 3,
> - .vtotal = 640 + 4 + 3 + 4,
> + .vsync_end = 640 + 4 + 2,
> + .vtotal = 640 + 4 + 2 + 4,
> .vrefresh = 60,
> .flags = DRM_MODE_FLAG_NVSYNC | DRM_MODE_FLAG_NHSYNC,
> };
> --
> 2.23.0
>
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Re: [PATCH] drm/panel-simple: Fix dotclock for Ortustech COM37H3M
On Tue, Mar 10, 2020 at 08:43:19AM +0100, H. Nikolaus Schaller wrote:
> The currently listed dotclock disagrees with the currently
> listed vrefresh rate. Change the dotclock to match the vrefresh.
>
> There are two variants of the COM37H3M panel.
> The older one's COM37H3M05DTC data sheet specifies:
>
> MIN TYP MAX
> CLK frequencyfCLK -- 22.426.3 MHz (in VGA mode)
> VSYNC Frequency fVSYNC 54 60 66 Hz
> VSYNC cycle time tv -- 650 -- H
> HSYNC frequency fHSYNC -- 39.3-- kHz
> HSYNC cycle time th -- 570 -- CLK
>
> The newer one's COM37H3M99DTC data sheet says:
>
> MIN TYP MAX
> CLK frequencyfCLK 18 19.827 MHz
> VSYNC Frequency fVSYNC 54 60 66 Hz
> VSYNC cycle time tv 646 650 700 H
> HSYNC frequency fHSYNC --39.050.0 kHz
> HSYNC cycle time th 504 508 630 CLK
>
> So we choose a parameter set that lies within the specs
> of both variants. We start at .vrefresh = 60,
> choose .htotal = 570 and .vtotal = 650 and end up
> in a clock of 22.230 MHz.
>
> Reported-by: Ville Syrjala
> Signed-off-by: H. Nikolaus Schaller
> ---
> drivers/gpu/drm/panel/panel-simple.c | 12 ++--
> 1 file changed, 6 insertions(+), 6 deletions(-)
>
> diff --git a/drivers/gpu/drm/panel/panel-simple.c
> b/drivers/gpu/drm/panel/panel-simple.c
> index e14c14ac62b5..b4cb23d4898d 100644
> --- a/drivers/gpu/drm/panel/panel-simple.c
> +++ b/drivers/gpu/drm/panel/panel-simple.c
> @@ -2390,15 +2390,15 @@ static const struct panel_desc ontat_yx700wv03 = {
> };
>
> static const struct drm_display_mode ortustech_com37h3m_mode = {
> - .clock = 22153,
> + .clock = 22230,
> .hdisplay = 480,
> - .hsync_start = 480 + 8,
> - .hsync_end = 480 + 8 + 10,
> - .htotal = 480 + 8 + 10 + 10,
> + .hsync_start = 480 + 40,
> + .hsync_end = 480 + 40 + 10,
> + .htotal = 480 + 40 + 10 + 40,
> .vdisplay = 640,
> .vsync_start = 640 + 4,
> - .vsync_end = 640 + 4 + 3,
> - .vtotal = 640 + 4 + 3 + 4,
> + .vsync_end = 640 + 4 + 2,
> + .vtotal = 640 + 4 + 2 + 4,
> .vrefresh = 60,
Numbers look consistent.
Reviewed-by: Ville Syrjälä
> .flags = DRM_MODE_FLAG_NVSYNC | DRM_MODE_FLAG_NHSYNC,
> };
> --
> 2.23.0
--
Ville Syrjälä
Intel
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[PATCH] drm/panel-simple: Fix dotclock for Ortustech COM37H3M
The currently listed dotclock disagrees with the currently
listed vrefresh rate. Change the dotclock to match the vrefresh.
There are two variants of the COM37H3M panel.
The older one's COM37H3M05DTC data sheet specifies:
MIN TYP MAX
CLK frequencyfCLK -- 22.426.3 MHz (in VGA mode)
VSYNC Frequency fVSYNC 54 60 66 Hz
VSYNC cycle time tv -- 650 -- H
HSYNC frequency fHSYNC -- 39.3-- kHz
HSYNC cycle time th -- 570 -- CLK
The newer one's COM37H3M99DTC data sheet says:
MIN TYP MAX
CLK frequencyfCLK 18 19.827 MHz
VSYNC Frequency fVSYNC 54 60 66 Hz
VSYNC cycle time tv 646 650 700 H
HSYNC frequency fHSYNC --39.050.0 kHz
HSYNC cycle time th 504 508 630 CLK
So we choose a parameter set that lies within the specs
of both variants. We start at .vrefresh = 60,
choose .htotal = 570 and .vtotal = 650 and end up
in a clock of 22.230 MHz.
Reported-by: Ville Syrjala
Signed-off-by: H. Nikolaus Schaller
---
drivers/gpu/drm/panel/panel-simple.c | 12 ++--
1 file changed, 6 insertions(+), 6 deletions(-)
diff --git a/drivers/gpu/drm/panel/panel-simple.c
b/drivers/gpu/drm/panel/panel-simple.c
index e14c14ac62b5..b4cb23d4898d 100644
--- a/drivers/gpu/drm/panel/panel-simple.c
+++ b/drivers/gpu/drm/panel/panel-simple.c
@@ -2390,15 +2390,15 @@ static const struct panel_desc ontat_yx700wv03 = {
};
static const struct drm_display_mode ortustech_com37h3m_mode = {
- .clock = 22153,
+ .clock = 22230,
.hdisplay = 480,
- .hsync_start = 480 + 8,
- .hsync_end = 480 + 8 + 10,
- .htotal = 480 + 8 + 10 + 10,
+ .hsync_start = 480 + 40,
+ .hsync_end = 480 + 40 + 10,
+ .htotal = 480 + 40 + 10 + 40,
.vdisplay = 640,
.vsync_start = 640 + 4,
- .vsync_end = 640 + 4 + 3,
- .vtotal = 640 + 4 + 3 + 4,
+ .vsync_end = 640 + 4 + 2,
+ .vtotal = 640 + 4 + 2 + 4,
.vrefresh = 60,
.flags = DRM_MODE_FLAG_NVSYNC | DRM_MODE_FLAG_NHSYNC,
};
--
2.23.0
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