linux-kernel - Re: [PATCH v4 03/11] drm/mediatek: gamma: Support SoC specific LUT size

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Date:   Fri, 26 May 2023 10:42:40 +0200
From:   AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>
To:     CK Hu (胡俊光) <ck.hu@...iatek.com>,
        "chunkuang.hu@...nel.org" <chunkuang.hu@...nel.org>
Cc:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-mediatek@...ts.infradead.org" 
        <linux-mediatek@...ts.infradead.org>,
        "wenst@...omium.org" <wenst@...omium.org>,
        Jason-JH Lin (林睿祥) 
        <Jason-JH.Lin@...iatek.com>,
        "kernel@...labora.com" <kernel@...labora.com>,
        "dri-devel@...ts.freedesktop.org" <dri-devel@...ts.freedesktop.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "matthias.bgg@...il.com" <matthias.bgg@...il.com>
Subject: Re: [PATCH v4 03/11] drm/mediatek: gamma: Support SoC specific LUT
 size

Il 26/05/23 07:20, CK Hu (胡俊光) ha scritto:
> Hi, Angelo:
> 
> On Thu, 2023-05-18 at 12:48 +0200, AngeloGioacchino Del Regno wrote:
>> External email : Please do not click links or open attachments until
>> you have verified the sender or the content.
>>
>>
>> Newer SoCs support a bigger Gamma LUT table: wire up a callback
>> to retrieve the correct LUT size for each different Gamma IP.
>>
>> Co-developed-by: Jason-JH.Lin <jason-jh.lin@...iatek.com>
>> Signed-off-by: Jason-JH.Lin <jason-jh.lin@...iatek.com>
>> [Angelo: Rewritten commit message/description + porting]
>> Signed-off-by: AngeloGioacchino Del Regno <
>> angelogioacchino.delregno@...labora.com>
>> Reviewed-by: Jason-JH.Lin <jason-jh.lin@...iatek.com>
>> ---
>>   drivers/gpu/drm/mediatek/mtk_disp_drv.h     |  1 +
>>   drivers/gpu/drm/mediatek/mtk_disp_gamma.c   | 25 ++++++++++++++++++-
>> --
>>   drivers/gpu/drm/mediatek/mtk_drm_crtc.c     |  4 ++--
>>   drivers/gpu/drm/mediatek/mtk_drm_crtc.h     |  1 -
>>   drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.c |  1 +
>>   drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.h |  9 ++++++++
>>   6 files changed, 35 insertions(+), 6 deletions(-)
>>
>> diff --git a/drivers/gpu/drm/mediatek/mtk_disp_drv.h
>> b/drivers/gpu/drm/mediatek/mtk_disp_drv.h
>> index 75045932353e..e554b19f4830 100644
>> --- a/drivers/gpu/drm/mediatek/mtk_disp_drv.h
>> +++ b/drivers/gpu/drm/mediatek/mtk_disp_drv.h
>> @@ -53,6 +53,7 @@ void mtk_gamma_clk_disable(struct device *dev);
>>   void mtk_gamma_config(struct device *dev, unsigned int w,
>>                        unsigned int h, unsigned int vrefresh,
>>                        unsigned int bpc, struct cmdq_pkt *cmdq_pkt);
>> +unsigned int mtk_gamma_get_lut_size(struct device *dev);
>>   void mtk_gamma_set(struct device *dev, struct drm_crtc_state
>> *state);
>>   void mtk_gamma_set_common(struct device *dev, void __iomem *regs,
>> struct drm_crtc_state *state);
>>   void mtk_gamma_start(struct device *dev);
>> diff --git a/drivers/gpu/drm/mediatek/mtk_disp_gamma.c
>> b/drivers/gpu/drm/mediatek/mtk_disp_gamma.c
>> index ce6f2499b891..d194d9bc2e2b 100644
>> --- a/drivers/gpu/drm/mediatek/mtk_disp_gamma.c
>> +++ b/drivers/gpu/drm/mediatek/mtk_disp_gamma.c
>> @@ -25,10 +25,12 @@
>>   #define DISP_GAMMA_LUT                         0x0700
>>
>>   #define LUT_10BIT_MASK                         0x03ff
>> +#define LUT_SIZE_DEFAULT                       512 /* for setting
>> gamma lut from AAL */
> 
> I would like to place AAL definition in AAL driver and pass it to gamma
> driver.
> 

This is not only for AAL, actually; I should remove that comment as it
may actually be misleading.

The default LUT size (512) is relevant for both the AAL case and the
older SoCs, where the LUT size is 512 and no multi-register.

I'll remove that comment in the next version

Regards,
Angelo