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Received: by smtp.zohomail.com with SMTPS id 179440289194724.462775649189325; Wed, 11 Nov 2026 05:14:51 -0800 (PST) Message-ID: <6fbe6fed-3ed4-4f87-a92b-dbd01e1674d3@collabora.com> Date: Wed, 11 Nov 2026 14:14:47 +0100 X-Archived-By: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v6 5/9] phy: rockchip-samsung-dcphy: Move block-level setup to runtime resume To: Jason Yang , Vinod Koul , Neil Armstrong , Manivannan Sadhasivam , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Heiko Stuebner , Guochun Huang , Philipp Zabel Cc: Sebastian Reichel , Bryan O'Donoghue , linux-phy@lists.infradead.org, devicetree@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-rockchip@lists.infradead.org, linux-kernel@vger.kernel.org References: <20261110-dcphy-rx-v1-v6-0-d681ba20b36a@gmail.com> <20261110-dcphy-rx-v1-v6-5-d681ba20b36a@gmail.com> Content-Language: en-US From: Michael Riesch In-Reply-To: <20261110-dcphy-rx-v1-v6-5-d681ba20b36a@gmail.com> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-ZohoMailClient: External X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.9.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20261111_051458_201192_69CE7B1D X-CRM114-Status: GOOD ( 19.09 ) X-Spam-Score: -2.1 (--) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" X-Spam-Status: No, score=-15.4 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_EF,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER,INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE, SPF_PASS,USER_AGENT_SANE_1 autolearn=ham autolearn_force=no version=4.0.1 X-Spam-Checker-Version: SpamAssassin 4.0.1 (2024-03-26) on aws-us-west-2-korg-listserv-alma10-1 Hi Jason, Thanks for the patch! On 11/10/26 09:18, Jason Yang wrote: > The APB reset and the BIAS references have to be treated as block-level > [1]: both the transmitter and the receiver need them, and they only have > to be programmed once. They are programmed from the transmitter's > power-on path today. > > A later change registers one struct phy for each of them, and a second > consumer coming up would then reset the block underneath a PHY that is > already running. > > Program them from runtime resume instead, where whichever of the two > comes up first brings the block up and a second one no longer resets it. > > This puts the BIAS writes ahead of the per-PHY reset assert, where the > TRM's worked example has them after [1]. That is safe: neither M_RESETN > nor S_RESETN covers the BIAS registers, and the values written are those > registers' reset defaults. > > [1] RK3588 TRM: sections 22.4.1 (address map), 22.4.2 (reset values), > 22.6.1.2 (reset) and 22.6.4.1 (D-PHY transmitter start-up) > > Signed-off-by: Jason Yang Reviewed-by: Michael Riesch Best regards, Michael > --- > drivers/phy/rockchip/phy-rockchip-samsung-dcphy.c | 11 ++++++----- > 1 file changed, 6 insertions(+), 5 deletions(-) > > diff --git a/drivers/phy/rockchip/phy-rockchip-samsung-dcphy.c b/drivers/phy/rockchip/phy-rockchip-samsung-dcphy.c > index 7a009d87a665..d6acc3e2d448 100644 > --- a/drivers/phy/rockchip/phy-rockchip-samsung-dcphy.c > +++ b/drivers/phy/rockchip/phy-rockchip-samsung-dcphy.c > @@ -1346,7 +1346,6 @@ static int samsung_mipi_dphy_power_on(struct samsung_mipi_dcphy *samsung) > > reset_control_assert(samsung->m_phy_rst); > > - samsung_mipi_dcphy_bias_block_enable(samsung); > samsung_mipi_dcphy_pll_configure(samsung); > samsung_mipi_dphy_clk_lane_timing_init(samsung); > samsung_mipi_dphy_data_lane_timing_init(samsung); > @@ -1373,10 +1372,6 @@ static int samsung_mipi_dcphy_power_on(struct phy *phy) > { > struct samsung_mipi_dcphy *samsung = phy_get_drvdata(phy); > > - reset_control_assert(samsung->apb_rst); > - udelay(1); > - reset_control_deassert(samsung->apb_rst); > - > switch (samsung->type) { > case PHY_TYPE_DPHY: > return samsung_mipi_dphy_power_on(samsung); > @@ -1667,6 +1662,12 @@ static __maybe_unused int samsung_mipi_dcphy_runtime_resume(struct device *dev) > return ret; > } > > + reset_control_assert(samsung->apb_rst); > + udelay(1); > + reset_control_deassert(samsung->apb_rst); > + > + samsung_mipi_dcphy_bias_block_enable(samsung); > + > return 0; > } > >