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dmarc=pass (p=none dis=none) header.from=sntech.de Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=sntech.de Received: from [194.95.143.137] (helo=phil.localnet) by gloria.sntech.de with esmtpsa (TLS1.3) tls TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 (Exim 4.94.2) (envelope-from ) id 1sFxOB-0000AO-Bf; Sat, 08 Jun 2024 16:49:51 +0200 From: Heiko Stuebner To: Val Packett Cc: stable@vger.kernel.org, Sandy Huang , Andy Yan , Maarten Lankhorst , Maxime Ripard , Thomas Zimmermann , David Airlie , Daniel Vetter , dri-devel@lists.freedesktop.org, linux-arm-kernel@lists.infradead.org, linux-rockchip@lists.infradead.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH v3 1/2] drm/rockchip: vop: clear DMA stop bit upon vblank on RK3066 Date: Sat, 08 Jun 2024 16:49:50 +0200 Message-ID: <4253237.VLH7GnMWUR@phil> In-Reply-To: References: <20240527231202.23365-1-val@packett.cool> Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="UTF-8" Am Sonntag, 2. Juni 2024, 05:35:36 CEST schrieb Val Packett: >=20 > On Mon, May 27 2024 at 20:11:49 -03:00:00, Val Packett=20 > wrote: > > The RK3066 VOP sets a dma_stop bit when it's done scanning out a frame > > and needs the driver to acknowledge that by clearing the bit. > >=20 > > So unless we clear it "between" frames, the RGB output only shows=20 > > noise > > instead of the picture. vblank seems to be the most appropriate place=20 > > to > > do it, since it indicates exactly that: that the hardware is done > > with the frame. > >=20 > > This seems to be a redundant synchronization mechanism that was=20 > > removed > > in later iterations of the VOP hardware block. > >=20 > > Fixes: f4a6de8 ("drm: rockchip: vop: add rk3066 vop definitions") > > Cc: stable@vger.kernel.org > > Signed-off-by: Val Packett > > --- > > drivers/gpu/drm/rockchip/rockchip_drm_vop.c | 6 ++++++ > > drivers/gpu/drm/rockchip/rockchip_drm_vop.h | 1 + > > drivers/gpu/drm/rockchip/rockchip_vop_reg.c | 1 + > > 3 files changed, 8 insertions(+) > >=20 > > diff --git a/drivers/gpu/drm/rockchip/rockchip_drm_vop.c=20 > > b/drivers/gpu/drm/rockchip/rockchip_drm_vop.c > > index a13473b2d..2731fe2b2 100644 > > --- a/drivers/gpu/drm/rockchip/rockchip_drm_vop.c > > +++ b/drivers/gpu/drm/rockchip/rockchip_drm_vop.c > > @@ -1766,6 +1766,12 @@ static void vop_handle_vblank(struct vop *vop) > > } > > spin_unlock(&drm->event_lock); > >=20 > > + if (VOP_HAS_REG(vop, common, dma_stop)) { > > + spin_lock(&vop->reg_lock); > > + VOP_REG_SET(vop, common, dma_stop, 0); > > + spin_unlock(&vop->reg_lock); > > + } > > + >=20 > Oops=E2=80=A6 so doing it here actually causes deadlocks, unless we also= =20 > change all other reg_lock usages to be spin_lock_irq/spin_unlock_irq. >=20 > Not sure if doing that or going back to v1 would be better. then please go back to v1 (as v4) :-) . I.e. regular spinlock vs. spin_lock_irq will have performance implications and this "feature" is a one-time only thing used only on a more than 10 year old soc, so it really must not affect stuff coming after it. Heiko From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 5B900C25B76 for ; Sat, 8 Jun 2024 14:50:25 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:MIME-Version:References:In-Reply-To: Message-ID:Date:Subject:Cc:To:From:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=ajzTg2haxg/tb6jo49UD0NEkCkyA5kVyJSJaWiGy/9E=; b=3DNaEQOSG4QDZo mfQa5t24K+j7xMrHQHcuwtz62u+0DZUTQaRildkKut1TPTCTXh1ycZkPPJsG8wbarFR0xlnxr6Uur A+KXuvi252ziCHFhWP/5QudmnXJX4GKC9fIzigirMWUqsfIq5UGIsoagu5Kc3OfqyLPvCMwGBCEPW fUCSA+d9y2WeUeOlkMHbLzCr0vNfFPGxI49srR9uAJj/M3UAL73GFBMcnowW5npOU9hL2YQRsJEw7 siBxZBCp0ePE+dS+y1eOqu24Ssc0NLkn9kCHbuHN1sfda2WSDVtQTAlNKRK7PgGR17wvJRIqUH6zM XC4sg8nui7w7nHb84tbA==; 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charset="utf-8" Content-Transfer-Encoding: base64 Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org QW0gU29ubnRhZywgMi4gSnVuaSAyMDI0LCAwNTozNTozNiBDRVNUIHNjaHJpZWIgVmFsIFBhY2tl dHQ6Cj4gCj4gT24gTW9uLCBNYXkgMjcgMjAyNCBhdCAyMDoxMTo0OSAtMDM6MDA6MDAsIFZhbCBQ YWNrZXR0IAo+IDx2YWxAcGFja2V0dC5jb29sPiB3cm90ZToKPiA+IFRoZSBSSzMwNjYgVk9QIHNl dHMgYSBkbWFfc3RvcCBiaXQgd2hlbiBpdCdzIGRvbmUgc2Nhbm5pbmcgb3V0IGEgZnJhbWUKPiA+ IGFuZCBuZWVkcyB0aGUgZHJpdmVyIHRvIGFja25vd2xlZGdlIHRoYXQgYnkgY2xlYXJpbmcgdGhl IGJpdC4KPiA+IAo+ID4gU28gdW5sZXNzIHdlIGNsZWFyIGl0ICJiZXR3ZWVuIiBmcmFtZXMsIHRo ZSBSR0Igb3V0cHV0IG9ubHkgc2hvd3MgCj4gPiBub2lzZQo+ID4gaW5zdGVhZCBvZiB0aGUgcGlj dHVyZS4gdmJsYW5rIHNlZW1zIHRvIGJlIHRoZSBtb3N0IGFwcHJvcHJpYXRlIHBsYWNlIAo+ID4g dG8KPiA+IGRvIGl0LCBzaW5jZSBpdCBpbmRpY2F0ZXMgZXhhY3RseSB0aGF0OiB0aGF0IHRoZSBo YXJkd2FyZSBpcyBkb25lCj4gPiB3aXRoIHRoZSBmcmFtZS4KPiA+IAo+ID4gVGhpcyBzZWVtcyB0 byBiZSBhIHJlZHVuZGFudCBzeW5jaHJvbml6YXRpb24gbWVjaGFuaXNtIHRoYXQgd2FzIAo+ID4g cmVtb3ZlZAo+ID4gaW4gbGF0ZXIgaXRlcmF0aW9ucyBvZiB0aGUgVk9QIGhhcmR3YXJlIGJsb2Nr Lgo+ID4gCj4gPiBGaXhlczogZjRhNmRlOCAoImRybTogcm9ja2NoaXA6IHZvcDogYWRkIHJrMzA2 NiB2b3AgZGVmaW5pdGlvbnMiKQo+ID4gQ2M6IHN0YWJsZUB2Z2VyLmtlcm5lbC5vcmcKPiA+IFNp Z25lZC1vZmYtYnk6IFZhbCBQYWNrZXR0IDx2YWxAcGFja2V0dC5jb29sPgo+ID4gLS0tCj4gPiAg ZHJpdmVycy9ncHUvZHJtL3JvY2tjaGlwL3JvY2tjaGlwX2RybV92b3AuYyB8IDYgKysrKysrCj4g PiAgZHJpdmVycy9ncHUvZHJtL3JvY2tjaGlwL3JvY2tjaGlwX2RybV92b3AuaCB8IDEgKwo+ID4g IGRyaXZlcnMvZ3B1L2RybS9yb2NrY2hpcC9yb2NrY2hpcF92b3BfcmVnLmMgfCAxICsKPiA+ICAz IGZpbGVzIGNoYW5nZWQsIDggaW5zZXJ0aW9ucygrKQo+ID4gCj4gPiBkaWZmIC0tZ2l0IGEvZHJp dmVycy9ncHUvZHJtL3JvY2tjaGlwL3JvY2tjaGlwX2RybV92b3AuYyAKPiA+IGIvZHJpdmVycy9n cHUvZHJtL3JvY2tjaGlwL3JvY2tjaGlwX2RybV92b3AuYwo+ID4gaW5kZXggYTEzNDczYjJkLi4y NzMxZmUyYjIgMTAwNjQ0Cj4gPiAtLS0gYS9kcml2ZXJzL2dwdS9kcm0vcm9ja2NoaXAvcm9ja2No aXBfZHJtX3ZvcC5jCj4gPiArKysgYi9kcml2ZXJzL2dwdS9kcm0vcm9ja2NoaXAvcm9ja2NoaXBf ZHJtX3ZvcC5jCj4gPiBAQCAtMTc2Niw2ICsxNzY2LDEyIEBAIHN0YXRpYyB2b2lkIHZvcF9oYW5k bGVfdmJsYW5rKHN0cnVjdCB2b3AgKnZvcCkKPiA+ICAJfQo+ID4gIAlzcGluX3VubG9jaygmZHJt LT5ldmVudF9sb2NrKTsKPiA+IAo+ID4gKwlpZiAoVk9QX0hBU19SRUcodm9wLCBjb21tb24sIGRt YV9zdG9wKSkgewo+ID4gKwkJc3Bpbl9sb2NrKCZ2b3AtPnJlZ19sb2NrKTsKPiA+ICsJCVZPUF9S RUdfU0VUKHZvcCwgY29tbW9uLCBkbWFfc3RvcCwgMCk7Cj4gPiArCQlzcGluX3VubG9jaygmdm9w LT5yZWdfbG9jayk7Cj4gPiArCX0KPiA+ICsKPiAKPiBPb3Bz4oCmIHNvIGRvaW5nIGl0IGhlcmUg YWN0dWFsbHkgY2F1c2VzIGRlYWRsb2NrcywgdW5sZXNzIHdlIGFsc28gCj4gY2hhbmdlIGFsbCBv dGhlciByZWdfbG9jayB1c2FnZXMgdG8gYmUgc3Bpbl9sb2NrX2lycS9zcGluX3VubG9ja19pcnEu Cj4gCj4gTm90IHN1cmUgaWYgZG9pbmcgdGhhdCBvciBnb2luZyBiYWNrIHRvIHYxIHdvdWxkIGJl IGJldHRlci4KCnRoZW4gcGxlYXNlIGdvIGJhY2sgdG8gdjEgKGFzIHY0KSA6LSkgLgoKSS5lLiBy ZWd1bGFyIHNwaW5sb2NrIHZzLiBzcGluX2xvY2tfaXJxIHdpbGwgaGF2ZSBwZXJmb3JtYW5jZQpp bXBsaWNhdGlvbnMgYW5kIHRoaXMgImZlYXR1cmUiIGlzIGEgb25lLXRpbWUgb25seSB0aGluZyB1 c2VkCm9ubHkgb24gYSBtb3JlIHRoYW4gMTAgeWVhciBvbGQgc29jLCBzbyBpdCByZWFsbHkgbXVz dCBub3QgYWZmZWN0CnN0dWZmIGNvbWluZyBhZnRlciBpdC4KCgpIZWlrbwoKCgpfX19fX19fX19f X19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fXwpsaW51eC1hcm0ta2VybmVsIG1h aWxpbmcgbGlzdApsaW51eC1hcm0ta2VybmVsQGxpc3RzLmluZnJhZGVhZC5vcmcKaHR0cDovL2xp c3RzLmluZnJhZGVhZC5vcmcvbWFpbG1hbi9saXN0aW5mby9saW51eC1hcm0ta2VybmVsCg==