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Fri, 14 Jun 2019 15:47:55 -0700 (PDT) Received: from tictac2.mtv.corp.google.com ([2620:15c:202:1:24fa:e766:52c9:e3b2]) by smtp.gmail.com with ESMTPSA id x7sm3706087pfm.82.2019.06.14.15.47.54 (version=TLS1_3 cipher=AEAD-AES256-GCM-SHA384 bits=256/256); Fri, 14 Jun 2019 15:47:54 -0700 (PDT) From: Douglas Anderson To: Sandy Huang , heiko@sntech.de, seanpaul@chromium.org Subject: [PATCH 1/2] drm/rockchip: Properly adjust to a true clock in adjusted_mode Date: Fri, 14 Jun 2019 15:47:29 -0700 Message-Id: <20190614224730.98622-1-dianders@chromium.org> X-Mailer: git-send-email 2.22.0.410.gd8fdbe21b5-goog MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20190614_154756_017537_67AC6AA1 X-CRM114-Status: GOOD ( 11.34 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: David Airlie , Douglas Anderson , dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org, urjaman@gmail.com, linux-rockchip@lists.infradead.org, Daniel Vetter , Yakir Yang , linux-arm-kernel@lists.infradead.org Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org X-Virus-Scanned: ClamAV using ClamSMTP When fixing up the clock in vop_crtc_mode_fixup() we're not doing it quite correctly. Specifically if we've got the true clock 266666667 Hz, we'll perform this calculation: 266666667 / 1000 => 266666 Later when we try to set the clock we'll do clk_set_rate(266666 * 1000). The common clock framework won't actually pick the proper clock in this case since it always wants clocks <= the specified one. Let's solve this by using DIV_ROUND_UP. Fixes: b59b8de31497 ("drm/rockchip: return a true clock rate to adjusted_mode") Signed-off-by: Douglas Anderson Signed-off-by: Sean Paul Reviewed-by: Yakir Yang --- Back in 2016 Mark Yao said he applied this to his drm fixes [1], but it's 2019 and it's still missing so I'm posting again. [1] https://patchwork.freedesktop.org/patch/103872/ drivers/gpu/drm/rockchip/rockchip_drm_vop.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/drivers/gpu/drm/rockchip/rockchip_drm_vop.c b/drivers/gpu/drm/rockchip/rockchip_drm_vop.c index e4580d8f21e1..d124f34ab9fc 100644 --- a/drivers/gpu/drm/rockchip/rockchip_drm_vop.c +++ b/drivers/gpu/drm/rockchip/rockchip_drm_vop.c @@ -1006,7 +1006,8 @@ static bool vop_crtc_mode_fixup(struct drm_crtc *crtc, struct vop *vop = to_vop(crtc); adjusted_mode->clock = - clk_round_rate(vop->dclk, mode->clock * 1000) / 1000; + DIV_ROUND_UP(clk_round_rate(vop->dclk, mode->clock * 1000), + 1000); return true; }