Donate to e Foundation | Murena handsets with /e/OS | Own a part of Murena! Learn more

Commit eb1300bc authored by Alex Deucher's avatar Alex Deucher Committed by Dave Airlie
Browse files

drm/radeon/kms: enable frac fb divs on rs600/rs690/rs740 



Allows us to hit dot clocks much closer, especially on
chips with non-27 Mhz reference clocks like most IGP chips.
This fixes most flickering and blanking problems with
non-exact dot clocks on these chips.

Signed-off-by: default avatarAlex Deucher <alexdeucher@gmail.com>
Signed-off-by: default avatarDave Airlie <airlied@redhat.com>
parent d0e275a9

drivers/gpu/drm/radeon/atombios_crtc.c

+6 −0
Original line number Diff line number Diff line
@@ -203,6 +203,12 @@ void atombios_crtc_set_pll(struct drm_crtc *crtc, struct drm_display_mode *mode) 
	if (ASIC_IS_AVIVO(rdev)) {

		uint32_t ss_cntl;



		if ((rdev->family == CHIP_RS600) ||

		    (rdev->family == CHIP_RS690) ||

		    (rdev->family == CHIP_RS740))

			pll_flags |= (RADEON_PLL_USE_FRAC_FB_DIV |

				      RADEON_PLL_PREFER_CLOSEST_LOWER);



		if (ASIC_IS_DCE32(rdev) && mode->clock > 200000)	/* range limits??? */

			pll_flags |= RADEON_PLL_PREFER_HIGH_FB_DIV;

		else