linux-kernel - Re: [PATCH v3 3/3] drm/tidss: oldi: Add atomic

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Message-ID: <9f894f18-ac82-46d1-afa6-2f786ba895b1@ti.com>
Date: Wed, 2 Jul 2025 11:51:02 +0530
From: Jayesh Choudhary <j-choudhary@...com>
To: Devarsh Thakkar <devarsht@...com>, <jyri.sarha@....fi>,
        <maarten.lankhorst@...ux.intel.com>, <mripard@...nel.org>,
        <tzimmermann@...e.de>, <dri-devel@...ts.freedesktop.org>,
        <tomi.valkeinen@...asonboard.com>, <mwalle@...nel.org>
CC: <airlied@...il.com>, <simona@...ll.ch>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v3 3/3] drm/tidss: oldi: Add atomic_check hook for oldi
 bridge

Hello Devarsh,

On 01/07/25 19:22, Devarsh Thakkar wrote:
> On 01/07/25 15:25, Jayesh Choudhary wrote:
>> Since OLDI consumes DSS VP clock directly as serial clock, certain
>> checks cannot be performed in tidss driver which should be checked
>> in oldi driver. Add check for mode clock and set the curr_max_pclk
>> field for tidss in case the VP is OLDI.
>>
>> Signed-off-by: Jayesh Choudhary <j-choudhary@...com>
>> ---
>>   drivers/gpu/drm/tidss/tidss_oldi.c | 24 ++++++++++++++++++++++++
>>   1 file changed, 24 insertions(+)
>>
>> diff --git a/drivers/gpu/drm/tidss/tidss_oldi.c 
>> b/drivers/gpu/drm/tidss/tidss_oldi.c
>> index 63e07c8edeaa..a1f5fb39b32c 100644
>> --- a/drivers/gpu/drm/tidss/tidss_oldi.c
>> +++ b/drivers/gpu/drm/tidss/tidss_oldi.c
>> @@ -309,6 +309,29 @@ static u32 
>> *tidss_oldi_atomic_get_input_bus_fmts(struct drm_bridge *bridge,
>>       return input_fmts;
>>   }
>> +static int tidss_oldi_bridge_atomic_check(struct drm_bridge *bridge,
>> +                      struct drm_bridge_state *bridge_state,
>> +                      struct drm_crtc_state *crtc_state,
>> +                      struct drm_connector_state *conn_state)
>> +{
>> +    struct tidss_oldi *oldi = drm_bridge_to_tidss_oldi(bridge);
>> +    struct drm_display_mode *adjusted_mode;
>> +    unsigned long round_clock;
>> +
>> +    adjusted_mode = &crtc_state->adjusted_mode;
>> +
>> +    if (adjusted_mode->clock > 
>> oldi->tidss->curr_max_pclk[oldi->parent_vp]) {
>> +        round_clock = clk_round_rate(oldi->serial, 
>> adjusted_mode->clock * 7 * 1000);
>> +
>> +        if (dispc_pclk_diff(adjusted_mode->clock * 7 * 1000, 
>> round_clock) > 5)
>> +            return -EINVAL;
>> +
>> +        oldi->tidss->curr_max_pclk[oldi->parent_vp] = round_clock;
>> +    }
>> +
>> +    return 0;
>> +}
>> +
>>   static const struct drm_bridge_funcs tidss_oldi_bridge_funcs = {
>>       .attach    = tidss_oldi_bridge_attach,
>>       .atomic_pre_enable = tidss_oldi_atomic_pre_enable,
>> @@ -317,6 +340,7 @@ static const struct drm_bridge_funcs 
>> tidss_oldi_bridge_funcs = {
>>       .atomic_duplicate_state = drm_atomic_helper_bridge_duplicate_state,
>>       .atomic_destroy_state = drm_atomic_helper_bridge_destroy_state,
>>       .atomic_reset = drm_atomic_helper_bridge_reset,
>> +    .atomic_check = tidss_oldi_bridge_atomic_check,
> 
> 
> Nitpick: looks like some mismatch in naming convention.
> We don't use bridge for other atomic calls for e.g. 
> tidss_oldi_atomic_pre_enable, tidss_oldi_atomic_post_disable so maybe 
> change those too ?

Will change in v4.

Thanks,
Jayesh

> 
> With suggested change,
> 
> Reviewed-by: Devarsh Thakkar <devarsht@...com>
> 
> Regards
> Devarsh
> 
>>   };
>>   static int get_oldi_mode(struct device_node *oldi_tx, int 
>> *companion_instance)