On Thu, May 07, 2018 at 15:46:02 +0200, Daniel Vetter wrote: > On Thu, May 03, 2018 at 01:53:55PM +0530, Satendra Singh Thakur wrote: > > 1.There is a function in drm-core to calculate display timing parameters: > > horizontal front porch, back porch, sync length, > > vertical front porch, back porch, sync length and > > clock in Hz. > > However, some drivers are still calculating these parameters themselves. > > Therefore, there is a duplication of the code. > > This patch series replaces this redundant code with the function > > drm_display_mode_to_videomode. > > This removes nearly 100 redundant lines from the related drivers. > > 2.For some drivers (sun4i) the reverse helper > > drm_display_mode_from_videomode is used. > > 3.For some drivers it replaces arithmatic operators (*, /) with shifting > > operators (>>, <<). > > 4.For some drivers DRM_MODE_FLAG_* are replaced with DISPLAY_FLAGS_* flags. > > 5.These changes apply to following crtc and encoder drivers: > > atmel-hlcdc > > bridge-tc358767 > > exynos-dsi > > fsl-dcu > > gma500-mdfld_dsi_dpi > > hisilicon-kirin_dsi, ade > > meson-encoder > > pl111-display > > sun4i-tv > > ti lcdc > > tegra dc > > mediatek dpi dsi > > bridge-adv7533 > > The drm_mode_to_videomode helper is meant for interop between drm and v4l, > which have different internal structures to represent modes. > > For drivers that only use drm I think the better option would be to add > these fields to struct drm_display_mode as another set of crtc_* values > (the computed values are stored in crtc_ prefixed members). And compute > front/back porch in drm_mode_set_crtcinfo. > > Then we can use these new drm_display_mode->crtc_h|vfront|back_porch > fields in all the drivers you're changing. This way you avoid having to > change all the drm drivers to use v4l #defines. > > Thanks, > Daniel Hi Daniel, Thanks for the comments. I will look into it. Thanks -Satendra -- To unsubscribe from this list: send the line "unsubscribe linux-samsung-soc" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
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