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bh=zE1zLu6pL3uqgPGPzZfTY/83E+cY4Cd10iRFX9/SaOs=; b=Po53vDPX65HL6NClbbr3hhqP5yF7v8feEJRZ4aacu/eltttbeEFv2plJ6LJDIZFQ3ye/Yf/DnnD0kAORtkCD42bluLAxEQFl4MrlEVKBONaQE3/CtleL1546UG23I8FrPP7I7OKil6TwHw40C4Q84Y58qH6kwlEbMoRxjwnYajw= ARC-Authentication-Results: i=1; mx.zohomail.com; dkim=pass header.i=collabora.com; spf=pass smtp.mailfrom=nicolas.frattaroli@collabora.com; dmarc=pass header.from= DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; t=1771845726; s=zohomail; d=collabora.com; i=nicolas.frattaroli@collabora.com; h=From:From:To:To:Cc:Cc:Subject:Subject:Date:Date:Message-ID:In-Reply-To:References:MIME-Version:Content-Transfer-Encoding:Content-Type:Message-Id:Reply-To; bh=zE1zLu6pL3uqgPGPzZfTY/83E+cY4Cd10iRFX9/SaOs=; b=ey8Oc4N/ijwyIwISAsnqyuzxwVpaDXPyWdOQrkVUmuNLUqcBICMAqwTs8Zyvf7Uk V3SFa2egcB4yao+jcsR4TTgjiNmrdjggG0klVO2zrceXcT92E/POQQ6LygQdb1+w9tA wV1bodCAlzCCpYR9uF+d/exsYpJDZf2sbF9djF+0= Received: by mx.zohomail.com with SMTPS id 1771845725129427.58768335061166; Mon, 23 Feb 2026 03:22:05 -0800 (PST) From: Nicolas Frattaroli To: Harry Wentland , Leo Li , Rodrigo Siqueira , Alex Deucher , Christian =?UTF-8?B?S8O2bmln?= , David Airlie , Simona Vetter , Maarten Lankhorst , Maxime Ripard , Thomas Zimmermann , Andrzej Hajda , Neil Armstrong , Robert Foss , Laurent Pinchart , Jonas Karlman , Jernej Skrabec , Sandy Huang , Heiko =?UTF-8?B?U3TDvGJuZXI=?= , Andy Yan , Jani Nikula , Rodrigo Vivi , Joonas Lahtinen , Tvrtko Ursulin , Dmitry Baryshkov , Sascha Hauer , Rob Herring , Jonathan Corbet , Cristian Ciocaltea Cc: kernel@collabora.com, amd-gfx@lists.freedesktop.org, dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-rockchip@lists.infradead.org, intel-gfx@lists.freedesktop.org, intel-xe@lists.freedesktop.org, linux-doc@vger.kernel.org Subject: Re: [PATCH v8 13/20] drm/bridge: dw-hdmi-qp: Implement atomic_get_output_bus_fmts Date: Mon, 23 Feb 2026 12:21:56 +0100 Message-ID: <5968719.DvuYhMxLoT@workhorse> In-Reply-To: References: <20260216-color-format-v8-0-5722ce175dd5@collabora.com> <20260216-color-format-v8-13-5722ce175dd5@collabora.com> Precedence: bulk X-Mailing-List: linux-doc@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 7Bit Content-Type: text/plain; charset="utf-8" On Sunday, 22 February 2026 11:42:39 Central European Standard Time Cristian Ciocaltea wrote: > Hi Nicolas, > > On 2/16/26 3:01 PM, Nicolas Frattaroli wrote: > > The atomic_get_output_bus_fmts callback is used by the DRM bridge layer > > to recursively select a suitable output format in a bridge chain. > > > > As a bridge that outputs to HDMI, dw-hdmi-qp will have its output > > formats determined by which formats the platform-specific integration of > > the hardware supports, and the chosen HDMI output bit depth. > > > > Implement this callback. The returned u32* buffer is supposed to be > > freed by the caller of this callback, as specified by the callback's > > documentation. > > > > Signed-off-by: Nicolas Frattaroli > > --- > > drivers/gpu/drm/bridge/synopsys/dw-hdmi-qp.c | 178 +++++++++++++++++++++++++++ > > 1 file changed, 178 insertions(+) > > > > diff --git a/drivers/gpu/drm/bridge/synopsys/dw-hdmi-qp.c b/drivers/gpu/drm/bridge/synopsys/dw-hdmi-qp.c > > index d649a1cf07f5..4c00218e5fd7 100644 > > --- a/drivers/gpu/drm/bridge/synopsys/dw-hdmi-qp.c > > +++ b/drivers/gpu/drm/bridge/synopsys/dw-hdmi-qp.c > > @@ -11,6 +11,7 @@ > > #include > > #include > > #include > > +#include > > #include > > #include > > #include > > @@ -749,6 +750,182 @@ static struct i2c_adapter *dw_hdmi_qp_i2c_adapter(struct dw_hdmi_qp *hdmi) > > return adap; > > } > > > > +static int dw_hdmi_qp_config_avi_infoframe(struct dw_hdmi_qp *hdmi, > > + const u8 *buffer, size_t len) > > +{ > > + u32 val, i, j; > > + > > + if (len != HDMI_INFOFRAME_SIZE(AVI)) { > > + dev_err(hdmi->dev, "failed to configure avi infoframe\n"); > > + return -EINVAL; > > + } > > + > > + /* > > + * DW HDMI QP IP uses a different byte format from standard AVI info > > + * frames, though generally the bits are in the correct bytes. > > + */ > > + val = buffer[1] << 8 | buffer[2] << 16; > > + dw_hdmi_qp_write(hdmi, val, PKT_AVI_CONTENTS0); > > + > > + for (i = 0; i < 4; i++) { > > + for (j = 0; j < 4; j++) { > > + if (i * 4 + j >= 14) > > + break; > > + if (!j) > > + val = buffer[i * 4 + j + 3]; > > + val |= buffer[i * 4 + j + 3] << (8 * j); > > + } > > + > > + dw_hdmi_qp_write(hdmi, val, PKT_AVI_CONTENTS1 + i * 4); > > + } > > + > > + dw_hdmi_qp_mod(hdmi, 0, PKTSCHED_AVI_FIELDRATE, PKTSCHED_PKT_CONFIG1); > > + > > + dw_hdmi_qp_mod(hdmi, PKTSCHED_AVI_TX_EN | PKTSCHED_GCP_TX_EN, > > + PKTSCHED_AVI_TX_EN | PKTSCHED_GCP_TX_EN, PKTSCHED_PKT_EN); > > + > > + return 0; > > +} > > + > > +static int dw_hdmi_qp_config_drm_infoframe(struct dw_hdmi_qp *hdmi, > > + const u8 *buffer, size_t len) > > +{ > > + u32 val, i; > > + > > + if (len != HDMI_INFOFRAME_SIZE(DRM)) { > > + dev_err(hdmi->dev, "failed to configure drm infoframe\n"); > > + return -EINVAL; > > + } > > + > > + dw_hdmi_qp_mod(hdmi, 0, PKTSCHED_DRMI_TX_EN, PKTSCHED_PKT_EN); > > + > > + val = buffer[1] << 8 | buffer[2] << 16; > > + dw_hdmi_qp_write(hdmi, val, PKT_DRMI_CONTENTS0); > > + > > + for (i = 0; i <= buffer[2]; i++) { > > + if (i % 4 == 0) > > + val = buffer[3 + i]; > > + val |= buffer[3 + i] << ((i % 4) * 8); > > + > > + if ((i % 4 == 3) || i == buffer[2]) > > + dw_hdmi_qp_write(hdmi, val, > > + PKT_DRMI_CONTENTS1 + ((i / 4) * 4)); > > + } > > + > > + dw_hdmi_qp_mod(hdmi, 0, PKTSCHED_DRMI_FIELDRATE, PKTSCHED_PKT_CONFIG1); > > + dw_hdmi_qp_mod(hdmi, PKTSCHED_DRMI_TX_EN, PKTSCHED_DRMI_TX_EN, > > + PKTSCHED_PKT_EN); > > + > > + return 0; > > +} > > + > > +/* > > + * Static values documented in the TRM > > + * Different values are only used for debug purposes > > + */ > > +#define DW_HDMI_QP_AUDIO_INFOFRAME_HB1 0x1 > > +#define DW_HDMI_QP_AUDIO_INFOFRAME_HB2 0xa > > + > > +static int dw_hdmi_qp_config_audio_infoframe(struct dw_hdmi_qp *hdmi, > > + const u8 *buffer, size_t len) > > +{ > > + /* > > + * AUDI_CONTENTS0: { RSV, HB2, HB1, RSV } > > + * AUDI_CONTENTS1: { PB3, PB2, PB1, PB0 } > > + * AUDI_CONTENTS2: { PB7, PB6, PB5, PB4 } > > + * > > + * PB0: CheckSum > > + * PB1: | CT3 | CT2 | CT1 | CT0 | F13 | CC2 | CC1 | CC0 | > > + * PB2: | F27 | F26 | F25 | SF2 | SF1 | SF0 | SS1 | SS0 | > > + * PB3: | F37 | F36 | F35 | F34 | F33 | F32 | F31 | F30 | > > + * PB4: | CA7 | CA6 | CA5 | CA4 | CA3 | CA2 | CA1 | CA0 | > > + * PB5: | DM_INH | LSV3 | LSV2 | LSV1 | LSV0 | F52 | F51 | F50 | > > + * PB6~PB10: Reserved > > + * > > + * AUDI_CONTENTS0 default value defined by HDMI specification, > > + * and shall only be changed for debug purposes. > > + */ > > + u32 header_bytes = (DW_HDMI_QP_AUDIO_INFOFRAME_HB1 << 8) | > > + (DW_HDMI_QP_AUDIO_INFOFRAME_HB2 << 16); > > + > > + regmap_bulk_write(hdmi->regm, PKT_AUDI_CONTENTS0, &header_bytes, 1); > > + regmap_bulk_write(hdmi->regm, PKT_AUDI_CONTENTS1, &buffer[3], 1); > > + regmap_bulk_write(hdmi->regm, PKT_AUDI_CONTENTS2, &buffer[4], 1); > > + > > + /* Enable ACR, AUDI, AMD */ > > + dw_hdmi_qp_mod(hdmi, > > + PKTSCHED_ACR_TX_EN | PKTSCHED_AUDI_TX_EN | PKTSCHED_AMD_TX_EN, > > + PKTSCHED_ACR_TX_EN | PKTSCHED_AUDI_TX_EN | PKTSCHED_AMD_TX_EN, > > + PKTSCHED_PKT_EN); > > + > > + /* Enable AUDS */ > > + dw_hdmi_qp_mod(hdmi, PKTSCHED_AUDS_TX_EN, PKTSCHED_AUDS_TX_EN, PKTSCHED_PKT_EN); > > + > > + return 0; > > +} > > Something's wrong with this patch as all the functions above have been dropped > since the HDMI VSI & SPD InfoFrames series [1] got merged. The previous > revision was fine though, hence that's likely an unexpected artifact of the > latest rebase. Oops, yeah, I think I messed this up during rebase. Thanks for letting me know! > > [1] https://lore.kernel.org/all/20260129-dw-hdmi-qp-iframe-v2-0-0157ad05232c@collabora.com/ >