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23 Apr 2020 11:43:50 -0700 Date: Thu, 23 Apr 2020 11:45:11 -0700 From: Manasi Navare To: Ville Syrjala Subject: Re: [Intel-gfx] [PATCH] drm/edid: Fix off-by-one in DispID DTD pixel clock Message-ID: <20200423184510.GA12177@intel.com> References: <20200423151743.18767-1-ville.syrjala@linux.intel.com> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <20200423151743.18767-1-ville.syrjala@linux.intel.com> User-Agent: Mutt/1.5.24 (2015-08-30) X-BeenThere: dri-devel@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Direct Rendering Infrastructure - Development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: intel-gfx@lists.freedesktop.org, stable@vger.kernel.org, dri-devel@lists.freedesktop.org Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" T24gVGh1LCBBcHIgMjMsIDIwMjAgYXQgMDY6MTc6NDNQTSArMDMwMCwgVmlsbGUgU3lyamFsYSB3 cm90ZToKPiBGcm9tOiBWaWxsZSBTeXJqw6Rsw6QgPHZpbGxlLnN5cmphbGFAbGludXguaW50ZWwu Y29tPgo+IAo+IFRoZSBEaXNwSUQgRFREIHBpeGVsIGNsb2NrIGlzIGRvY3VtZW50ZWQgYXM6Cj4g IjAwIDAwIDAwIGgg4oaSIEZGIEZGIEZGIGggfCBQaXhlbCBjbG9jayDDtyAxMCwwMDAgMC4wMSDi hpIgMTY3LDc3Mi4xNiBNZWdhIFBpeGVscyBwZXIgU2VjIgo+IFdoaWNoIHNlZW1zIHRvIGltcGx5 IHRoYXQgd2UgdG8gYWRkIG9uZSB0byB0aGUgcmF3IHZhbHVlLgo+IAo+IFJlYWxpdHkgc2VlbXMg dG8gYWdyZWUgYXMgdGhlcmUgYXJlIHRpbGVkIGRpc3BsYXlzIGluIHRoZSB3aWxkCj4gd2hpY2gg Y3VycmVudGx5IHNob3cgYSAxMGtIeiBkaWZmZXJlbmNlIGluIHRoZSBwaXhlbCBjbG9jawo+IGJl dHdlZW4gdGhlIHRpbGVzIChvbmUgdGlsZSBnZXRzIGl0cyBtb2RlIGZyb20gdGhlIGJhc2UgRURJ RCwKPiB0aGUgb3RoZXIgZnJvbSB0aGUgRGlzcElEIGJsb2NrKS4KPiAKPiBDYzogc3RhYmxlQHZn ZXIua2VybmVsLm9yZwo+IFJlZmVyZW5jZXM6IGh0dHBzOi8vZ2l0bGFiLmZyZWVkZXNrdG9wLm9y Zy9kcm0vaW50ZWwvLS9pc3N1ZXMvMjcKPiBTaWduZWQtb2ZmLWJ5OiBWaWxsZSBTeXJqw6Rsw6Qg PHZpbGxlLnN5cmphbGFAbGludXguaW50ZWwuY29tPgoKTWFrZXMgdG90YWwgc2Vuc2UsCgpSZXZp ZXdlZC1ieTogTWFuYXNpIE5hdmFyZSA8bWFuYXNpLmQubmF2YXJlQGludGVsLmNvbT4KCk1hbmFz aQoKPiAtLS0KPiAgZHJpdmVycy9ncHUvZHJtL2RybV9lZGlkLmMgfCAyICstCj4gIDEgZmlsZSBj aGFuZ2VkLCAxIGluc2VydGlvbigrKSwgMSBkZWxldGlvbigtKQo+IAo+IGRpZmYgLS1naXQgYS9k cml2ZXJzL2dwdS9kcm0vZHJtX2VkaWQuYyBiL2RyaXZlcnMvZ3B1L2RybS9kcm1fZWRpZC5jCj4g aW5kZXggNDNiNmNhMzY0ZGFhLi41NDRkMjYwM2Y1ZmMgMTAwNjQ0Cj4gLS0tIGEvZHJpdmVycy9n cHUvZHJtL2RybV9lZGlkLmMKPiArKysgYi9kcml2ZXJzL2dwdS9kcm0vZHJtX2VkaWQuYwo+IEBA IC01MTIwLDcgKzUxMjAsNyBAQCBzdGF0aWMgc3RydWN0IGRybV9kaXNwbGF5X21vZGUgKmRybV9t b2RlX2Rpc3BsYXlpZF9kZXRhaWxlZChzdHJ1Y3QgZHJtX2RldmljZSAqZAo+ICAJc3RydWN0IGRy bV9kaXNwbGF5X21vZGUgKm1vZGU7Cj4gIAl1bnNpZ25lZCBwaXhlbF9jbG9jayA9ICh0aW1pbmdz LT5waXhlbF9jbG9ja1swXSB8Cj4gIAkJCQkodGltaW5ncy0+cGl4ZWxfY2xvY2tbMV0gPDwgOCkg fAo+IC0JCQkJKHRpbWluZ3MtPnBpeGVsX2Nsb2NrWzJdIDw8IDE2KSk7Cj4gKwkJCQkodGltaW5n cy0+cGl4ZWxfY2xvY2tbMl0gPDwgMTYpKSArIDE7Cj4gIAl1bnNpZ25lZCBoYWN0aXZlID0gKHRp bWluZ3MtPmhhY3RpdmVbMF0gfCB0aW1pbmdzLT5oYWN0aXZlWzFdIDw8IDgpICsgMTsKPiAgCXVu c2lnbmVkIGhibGFuayA9ICh0aW1pbmdzLT5oYmxhbmtbMF0gfCB0aW1pbmdzLT5oYmxhbmtbMV0g PDwgOCkgKyAxOwo+ICAJdW5zaWduZWQgaHN5bmMgPSAodGltaW5ncy0+aHN5bmNbMF0gfCAodGlt aW5ncy0+aHN5bmNbMV0gJiAweDdmKSA8PCA4KSArIDE7Cj4gLS0gCj4gMi4yNC4xCj4gCj4gX19f X19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX18KPiBJbnRlbC1nZngg bWFpbGluZyBsaXN0Cj4gSW50ZWwtZ2Z4QGxpc3RzLmZyZWVkZXNrdG9wLm9yZwo+IGh0dHBzOi8v bGlzdHMuZnJlZWRlc2t0b3Aub3JnL21haWxtYW4vbGlzdGluZm8vaW50ZWwtZ2Z4Cl9fX19fX19f X19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fCmRyaS1kZXZlbCBtYWlsaW5n IGxpc3QKZHJpLWRldmVsQGxpc3RzLmZyZWVkZXNrdG9wLm9yZwpodHRwczovL2xpc3RzLmZyZWVk ZXNrdG9wLm9yZy9tYWlsbWFuL2xpc3RpbmZvL2RyaS1kZXZlbAo= 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 X-Spam-Level: X-Spam-Status: No, score=-8.3 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS, USER_AGENT_SANE_1 autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id A5551C55191 for ; 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d="scan'208";a="457013796" Received: from unknown (HELO intel.com) ([10.165.21.211]) by fmsmga005.fm.intel.com with ESMTP; 23 Apr 2020 11:43:50 -0700 Date: Thu, 23 Apr 2020 11:45:11 -0700 From: Manasi Navare To: Ville Syrjala Cc: dri-devel@lists.freedesktop.org, intel-gfx@lists.freedesktop.org, stable@vger.kernel.org Subject: Re: [Intel-gfx] [PATCH] drm/edid: Fix off-by-one in DispID DTD pixel clock Message-ID: <20200423184510.GA12177@intel.com> References: <20200423151743.18767-1-ville.syrjala@linux.intel.com> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: <20200423151743.18767-1-ville.syrjala@linux.intel.com> User-Agent: Mutt/1.5.24 (2015-08-30) Sender: stable-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org On Thu, Apr 23, 2020 at 06:17:43PM +0300, Ville Syrjala wrote: > From: Ville Syrjälä > > The DispID DTD pixel clock is documented as: > "00 00 00 h → FF FF FF h | Pixel clock ÷ 10,000 0.01 → 167,772.16 Mega Pixels per Sec" > Which seems to imply that we to add one to the raw value. > > Reality seems to agree as there are tiled displays in the wild > which currently show a 10kHz difference in the pixel clock > between the tiles (one tile gets its mode from the base EDID, > the other from the DispID block). > > Cc: stable@vger.kernel.org > References: https://gitlab.freedesktop.org/drm/intel/-/issues/27 > Signed-off-by: Ville Syrjälä Makes total sense, Reviewed-by: Manasi Navare Manasi > --- > drivers/gpu/drm/drm_edid.c | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) > > diff --git a/drivers/gpu/drm/drm_edid.c b/drivers/gpu/drm/drm_edid.c > index 43b6ca364daa..544d2603f5fc 100644 > --- a/drivers/gpu/drm/drm_edid.c > +++ b/drivers/gpu/drm/drm_edid.c > @@ -5120,7 +5120,7 @@ static struct drm_display_mode *drm_mode_displayid_detailed(struct drm_device *d > struct drm_display_mode *mode; > unsigned pixel_clock = (timings->pixel_clock[0] | > (timings->pixel_clock[1] << 8) | > - (timings->pixel_clock[2] << 16)); > + (timings->pixel_clock[2] << 16)) + 1; > unsigned hactive = (timings->hactive[0] | timings->hactive[1] << 8) + 1; > unsigned hblank = (timings->hblank[0] | timings->hblank[1] << 8) + 1; > unsigned hsync = (timings->hsync[0] | (timings->hsync[1] & 0x7f) << 8) + 1; > -- > 2.24.1 > > _______________________________________________ > Intel-gfx mailing list > Intel-gfx@lists.freedesktop.org > https://lists.freedesktop.org/mailman/listinfo/intel-gfx