linux-kernel - Re: [PATCH 04/10] drm/msm/dsi: dsi_host: Fix DSI index detection when version clash occurs

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Message-ID: <4eed93cd-e5dd-9988-fd8a-4070922aab28@linaro.org>
Date:   Mon, 13 Feb 2023 10:19:12 +0100
From:   Konrad Dybcio <konrad.dybcio@...aro.org>
To:     Dmitry Baryshkov <dmitry.baryshkov@...aro.org>,
        linux-arm-msm@...r.kernel.org, andersson@...nel.org,
        agross@...nel.org, krzysztof.kozlowski@...aro.org
Cc:     marijn.suijten@...ainline.org, Rob Clark <robdclark@...il.com>,
        Abhinav Kumar <quic_abhinavk@...cinc.com>,
        Sean Paul <sean@...rly.run>, David Airlie <airlied@...il.com>,
        Daniel Vetter <daniel@...ll.ch>,
        Neil Armstrong <neil.armstrong@...aro.org>,
        Vinod Koul <vkoul@...nel.org>,
        Douglas Anderson <dianders@...omium.org>,
        Loic Poulain <loic.poulain@...aro.org>,
        Vladimir Lypak <vladimir.lypak@...il.com>,
        Archit Taneja <architt@...eaurora.org>,
        dri-devel@...ts.freedesktop.org, freedreno@...ts.freedesktop.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 04/10] drm/msm/dsi: dsi_host: Fix DSI index detection when
 version clash occurs



On 11.02.2023 14:26, Dmitry Baryshkov wrote:
> On 11/02/2023 13:51, Konrad Dybcio wrote:
>> Now that msm_dsi_config is ready to accept multiple sets of registers
>> (where array[n][idx] holds the base registers of DSI(idx) for the nth
>> entry), loop through all available configs to resolve hw version
>> clashes.
>>
>> Fixes: 32280d66fd44 ("drm/msm/dsi: Don't get DSI index from DT")
> 
> Do we really want to backport this patch (and other patches from this series to older kernels?)
> 
>> Signed-off-by: Konrad Dybcio <konrad.dybcio@...aro.org>
>> ---
>>   drivers/gpu/drm/msm/dsi/dsi_cfg.h  |  1 +
>>   drivers/gpu/drm/msm/dsi/dsi_host.c | 12 +++++++-----
>>   2 files changed, 8 insertions(+), 5 deletions(-)
>>
>> diff --git a/drivers/gpu/drm/msm/dsi/dsi_cfg.h b/drivers/gpu/drm/msm/dsi/dsi_cfg.h
>> index 03493cc6b772..4a47705234bd 100644
>> --- a/drivers/gpu/drm/msm/dsi/dsi_cfg.h
>> +++ b/drivers/gpu/drm/msm/dsi/dsi_cfg.h
>> @@ -43,6 +43,7 @@ struct msm_dsi_config {
>>       const int num_bus_clks;
>>       /* Allow + 1 entry for the zero-terminator */
>>       const resource_size_t io_start[VARIANTS_MAX][DSI_MAX + 1];
>> +    const int num_variants;
>>   };
>>     struct msm_dsi_host_cfg_ops {
>> diff --git a/drivers/gpu/drm/msm/dsi/dsi_host.c b/drivers/gpu/drm/msm/dsi/dsi_host.c
>> index f5092b4d0757..8dfa69bcff77 100644
>> --- a/drivers/gpu/drm/msm/dsi/dsi_host.c
>> +++ b/drivers/gpu/drm/msm/dsi/dsi_host.c
>> @@ -1862,16 +1862,18 @@ static int dsi_host_get_id(struct msm_dsi_host *msm_host)
>>       struct platform_device *pdev = msm_host->pdev;
>>       const struct msm_dsi_config *cfg = msm_host->cfg_hnd->cfg;
>>       struct resource *res;
>> -    int i;
>> +    int i, j, num_variants;
>>         res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "dsi_ctrl");
>>       if (!res)
>>           return -EINVAL;
>>   -    for (i = 0; cfg->io_start[0][i]; i++) {
>> -        if (cfg->io_start[0][i] == res->start)
>> -            return i;
>> -    }
>> +    num_variants = cfg->num_variants ? cfg->num_variants : 1;
>> +
>> +    for (i = 0; i < num_variants; i++)
>> +        for (j = 0; cfg->io_start[i][j]; j++)
>> +            if (cfg->io_start[i][j] == res->start)
>> +                return j;
>>         return -EINVAL;
>>   }
> 
> Please squash this together with the patch 'drm/msm/dsi: Turn msm_dsi_config::io_start into a 2d array'.
Ack

Konrad
>