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Tue, 12 Aug 2025 13:02:35 -0500 Received: from DLEE110.ent.ti.com (157.170.170.21) by DLEE115.ent.ti.com (157.170.170.26) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256_P256) id 15.1.2507.55; Tue, 12 Aug 2025 13:02:34 -0500 Received: from lelvem-mr06.itg.ti.com (10.180.75.8) by DLEE110.ent.ti.com (157.170.170.21) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256_P256) id 15.1.2507.55 via Frontend Transport; Tue, 12 Aug 2025 13:02:34 -0500 Received: from [172.24.233.20] (a0512632.dhcp.ti.com [172.24.233.20]) by lelvem-mr06.itg.ti.com (8.18.1/8.18.1) with ESMTP id 57CI2R58748582; Tue, 12 Aug 2025 13:02:28 -0500 Message-ID: <86cf7d99-1295-42ab-acda-88a8212ec4d4@ti.com> Date: Tue, 12 Aug 2025 23:32:27 +0530 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH 4/4] drm/tidss: Fix sampling edge configuration To: Louis Chauvet , devarsh , "Jyri Sarha" , Tomi Valkeinen , Maarten Lankhorst , Maxime Ripard , Thomas Zimmermann , David Airlie , Simona Vetter , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Sam Ravnborg , Benoit Parrot , Lee Jones , Nishanth Menon , Vignesh Raghavendra , Tero Kristo CC: , Jyri Sarha , Tomi Valkeinen , , , , , References: <20250730-fix-edge-handling-v1-0-1bdfb3fe7922@bootlin.com> <20250730-fix-edge-handling-v1-4-1bdfb3fe7922@bootlin.com> <71ef3203-e11d-4244-8d2d-8e47e8ba6140@ti.com> Content-Language: en-US From: Swamil Jain In-Reply-To: Content-Type: text/plain; charset="UTF-8"; format=flowed Content-Transfer-Encoding: 8bit X-C2ProcessedOrg: 333ef613-75bf-4e12-a4b1-8e3623f5dcea X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20250812_110305_685565_482F1E86 X-CRM114-Status: GOOD ( 25.06 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On 8/11/25 15:26, Louis Chauvet wrote: > > > Le 08/08/2025 à 18:26, Swamil Jain a écrit : >> >> >> On 8/8/25 19:16, devarsh wrote: >>> Hi Louis, >>> >>> Thanks for the patch. >>> >>> On 30/07/25 22:32, Louis Chauvet wrote: >>>> As stated in the AM62x Technical Reference Manual (SPRUIV7B), the data >>>> sampling edge needs to be configured in two distinct registers: one >>>> in the >>>> TIDSS IP and another in the memory-mapped control register modules. >>> >>> I don't think AM62x is thee only one which requires this and on the >>> contrary not all SoCs require this extra setting. We had been waiting on >>> confirmations from hardware team and very recently they gave a list of >>> SoCs which require this, as per that I think we need to limit this to >>> AM62x and AM62A per current supported SoCs. >>> >>> Swamil, >>> Please confirm on this and share if any additional details required >>> here. >>> >> >> Yeah Devarsh, as you mentioned, this is valid for AM62X, AM62A and >> AM62P. We would have upstreamed this feature, but there are some >> corrections in Technical Reference Manual for these SoCs regarding >> programming CTRL_MMR_DPI_CLK_CTRL register fields, we are in loop with >> H/W team, waiting for their official confirmation regarding this issue. >> >> Thanks Louis for working on this patch, but we should wait for H/W >> team's confirmation. > > Hello all, > > Thanks for the feedback. I was not aware of this current work. > Do you plan to send the fix yourself? Should I wait your HW team > feedback and send a v2? > Hi Louis, H/W team confirmed that, CTRL_MMR_DPI0_CLK_CTRL.bit[8] should be programmed same as DSS_VP1_POL_FREQ.bit[14](IPC) and CTRL_MMR_DPI0_CLK_CTRL.bit[9] should be programmed same as DSS_VP1_POL_FREQ.bit[16](RF). Please continue with you patches. > I also have a very similar patch ready for u-boot (depending on the same > DT modifications), do you plan to fix u-boot too? > Please fix u-boot also. Thanks and regards, Swamil. > Thanks, > Louis Chauvet > > >> Regards, >> Swamil. >> >>> Regards >>> Devarsh >>> >>>    Since >>>> the latter is not within the same address range, a phandle to a syscon >>>> device is used to access the regmap. >>>> >>>> Fixes: 32a1795f57ee ("drm/tidss: New driver for TI Keystone platform >>>> Display SubSystem") >>>> Signed-off-by: Louis Chauvet >>>> >>>> --- >>>> >>>> Cc: stable@vger.kernel.org >>>> --- >>>>    drivers/gpu/drm/tidss/tidss_dispc.c | 14 ++++++++++++++ >>>>    1 file changed, 14 insertions(+) >>>> >>>> diff --git a/drivers/gpu/drm/tidss/tidss_dispc.c >>>> b/drivers/gpu/drm/tidss/tidss_dispc.c >>>> index >>>> c0277fa36425ee1f966dccecf2b69a2d01794899..65ca7629a2e75437023bf58f8a1bddc24db5e3da 100644 >>>> --- a/drivers/gpu/drm/tidss/tidss_dispc.c >>>> +++ b/drivers/gpu/drm/tidss/tidss_dispc.c >>>> @@ -498,6 +498,7 @@ struct dispc_device { >>>>        const struct dispc_features *feat; >>>>        struct clk *fclk; >>>> +    struct regmap *clk_ctrl; >>>>        bool is_enabled; >>>> @@ -1267,6 +1268,11 @@ void dispc_vp_enable(struct dispc_device >>>> *dispc, u32 hw_videoport, >>>>                   FLD_VAL(mode->vdisplay - 1, 27, 16)); >>>>        VP_REG_FLD_MOD(dispc, hw_videoport, DISPC_VP_CONTROL, 1, 0, 0); >>>> + >>>> +    if (dispc->clk_ctrl) { >>>> +        regmap_update_bits(dispc->clk_ctrl, 0, 0x100, ipc ? 0x100 : >>>> 0x000); >>>> +        regmap_update_bits(dispc->clk_ctrl, 0, 0x200, rf ? 0x200 : >>>> 0x000); >>>> +    } >>>>    } >>>>    void dispc_vp_disable(struct dispc_device *dispc, u32 hw_videoport) >>>> @@ -3012,6 +3018,14 @@ int dispc_init(struct tidss_device *tidss) >>>>        dispc_init_errata(dispc); >>>> +    dispc->clk_ctrl = >>>> syscon_regmap_lookup_by_phandle_optional(tidss->dev->of_node, >>>> +                                   "ti,clk-ctrl"); >>>> +    if (IS_ERR(dispc->clk_ctrl)) { >>>> +        r = dev_err_probe(dispc->dev, PTR_ERR(dispc->clk_ctrl), >>>> +                  "DISPC: syscon_regmap_lookup_by_phandle failed.\n"); >>>> +        return r; >>>> +    } >>>> + >>>>        dispc->fourccs = devm_kcalloc(dev, >>>> ARRAY_SIZE(dispc_color_formats), >>>>                          sizeof(*dispc->fourccs), GFP_KERNEL); >>>>        if (!dispc->fourccs) >>>> >>> >