Re: [PATCH 2/2] drm/fsl-dcu: use drm_display_mode_to_videomode to calculate timing parameters

Stefan Agner
2018-10-01T20:03:33Z

On 01.10.2018 09:57, Daniel Vetter wrote:
> On Wed, Sep 26, 2018 at 10:41:50PM +0200, Stefan Agner wrote:
>> From: Satendra Singh Thakur <satendra.t@samsung.com>
>>
>> Use the drm_display_mode_to_videomode function to calculate front/
>> back porches and sync length.
>>
>> Cc: Madhur Verma <madhur.verma@samsung.com>
>> Cc: Hemanshu Srivastava <hemanshu.s@samsung.com>
>> Signed-off-by: Satendra Singh Thakur <satendra.t@samsung.com>
>> Signed-off-by: Stefan Agner <stefan@agner.ch>
>
> I think if lots of people want this (iirc yours not the only driver that
> wants front/back-porch) we should extend the computed crtc_* fields with
> this. Kinda silly we force people to go through v4l videomode in drm
> drivers. But then, this gets the job done, so maybe an idea for todo.rst?

Hm, I see, yeah seems rather straight forward to calculate this
information in drm_mode_set_crtcinfo().

>
> On both patches:
>
> Acked-by: Daniel Vetter <daniel.vetter@ffwll.ch>

Thanks, applied both.

--
Stefan

>> ---
>> drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_crtc.c | 32 ++++++++++------------
>> 1 file changed, 14 insertions(+), 18 deletions(-)
>>
>> diff --git a/drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_crtc.c b/drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_crtc.c
>> index 05d1c9977395..18afc94e4dff 100644
>> --- a/drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_crtc.c
>> +++ b/drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_crtc.c
>> @@ -17,6 +17,7 @@
>> #include <drm/drm_atomic_helper.h>
>> #include <drm/drm_crtc.h>
>> #include <drm/drm_crtc_helper.h>
>> +#include <video/videomode.h>
>>
>> #include "fsl_dcu_drm_crtc.h"
>> #include "fsl_dcu_drm_drv.h"
>> @@ -85,39 +86,34 @@ static void fsl_dcu_drm_crtc_mode_set_nofb(struct drm_crtc *crtc)
>> struct fsl_dcu_drm_device *fsl_dev = dev->dev_private;
>> struct drm_connector *con = &fsl_dev->connector.base;
>> struct drm_display_mode *mode = &crtc->state->mode;
>> - unsigned int hbp, hfp, hsw, vbp, vfp, vsw, pol = 0;
>> + unsigned int pol = 0;
>> + struct videomode vm;
>>
>> clk_set_rate(fsl_dev->pix_clk, mode->clock * 1000);
>>
>> - /* Configure timings: */
>> - hbp = mode->htotal - mode->hsync_end;
>> - hfp = mode->hsync_start - mode->hdisplay;
>> - hsw = mode->hsync_end - mode->hsync_start;
>> - vbp = mode->vtotal - mode->vsync_end;
>> - vfp = mode->vsync_start - mode->vdisplay;
>> - vsw = mode->vsync_end - mode->vsync_start;
>> + drm_display_mode_to_videomode(mode, &vm);
>>
>> /* INV_PXCK as default (most display sample data on rising edge) */
>> if (!(con->display_info.bus_flags & DRM_BUS_FLAG_PIXDATA_POSEDGE))
>> pol |= DCU_SYN_POL_INV_PXCK;
>>
>> - if (mode->flags & DRM_MODE_FLAG_NHSYNC)
>> + if (vm.flags & DISPLAY_FLAGS_HSYNC_LOW)
>> pol |= DCU_SYN_POL_INV_HS_LOW;
>>
>> - if (mode->flags & DRM_MODE_FLAG_NVSYNC)
>> + if (vm.flags & DISPLAY_FLAGS_VSYNC_LOW)
>> pol |= DCU_SYN_POL_INV_VS_LOW;
>>
>> regmap_write(fsl_dev->regmap, DCU_HSYN_PARA,
>> - DCU_HSYN_PARA_BP(hbp) |
>> - DCU_HSYN_PARA_PW(hsw) |
>> - DCU_HSYN_PARA_FP(hfp));
>> + DCU_HSYN_PARA_BP(vm.hback_porch) |
>> + DCU_HSYN_PARA_PW(vm.hsync_len) |
>> + DCU_HSYN_PARA_FP(vm.hfront_porch));
>> regmap_write(fsl_dev->regmap, DCU_VSYN_PARA,
>> - DCU_VSYN_PARA_BP(vbp) |
>> - DCU_VSYN_PARA_PW(vsw) |
>> - DCU_VSYN_PARA_FP(vfp));
>> + DCU_VSYN_PARA_BP(vm.vback_porch) |
>> + DCU_VSYN_PARA_PW(vm.vsync_len) |
>> + DCU_VSYN_PARA_FP(vm.vfront_porch));
>> regmap_write(fsl_dev->regmap, DCU_DISP_SIZE,
>> - DCU_DISP_SIZE_DELTA_Y(mode->vdisplay) |
>> - DCU_DISP_SIZE_DELTA_X(mode->hdisplay));
>> + DCU_DISP_SIZE_DELTA_Y(vm.vactive) |
>> + DCU_DISP_SIZE_DELTA_X(vm.hactive));
>> regmap_write(fsl_dev->regmap, DCU_SYN_POL, pol);
>> regmap_write(fsl_dev->regmap, DCU_BGND, DCU_BGND_R(0) |
>> DCU_BGND_G(0) | DCU_BGND_B(0));
>> --
>> 2.19.0
>>
>> _______________________________________________
>> dri-devel mailing list
>> dri-devel@lists.freedesktop.org
>> https://lists.freedesktop.org/mailman/listinfo/dri-devel