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Date: Thu, 28 Jan 2021 13:09:26 +0800
From: Hsin-Yi Wang <hsinyi@...omium.org>
To: CK Hu <ck.hu@...iatek.com>
Cc: Philipp Zabel <p.zabel@...gutronix.de>,
Matthias Brugger <matthias.bgg@...il.com>,
David Airlie <airlied@...ux.ie>,
Daniel Vetter <daniel@...ll.ch>,
Mark Rutland <mark.rutland@....com>,
dri-devel <dri-devel@...ts.freedesktop.org>,
Devicetree List <devicetree@...r.kernel.org>,
lkml <linux-kernel@...r.kernel.org>,
"moderated list:ARM/FREESCALE IMX / MXC ARM ARCHITECTURE"
<linux-arm-kernel@...ts.infradead.org>,
"moderated list:ARM/Mediatek SoC support"
<linux-mediatek@...ts.infradead.org>,
Project_Global_Chrome_Upstream_Group@...iatek.com,
Yongqiang Niu <yongqiang.niu@...iatek.com>
Subject: Re: [PATCH v10 4/9] drm/mediatek: generalize mtk_dither_set() function
On Thu, Jan 28, 2021 at 12:39 PM CK Hu <ck.hu@...iatek.com> wrote:
>
> Hi, Hsin-Yi:
>
> On Wed, 2021-01-27 at 12:54 +0800, Hsin-Yi Wang wrote:
> > There may be data structure other than mtk_ddp_comp_dev that would call
> > mtk_dither_set(), so use regs as parameter instead of device.
>
> You does not change the interface of mtk_dither_set(). You move the
> common part in mtk_dither_set() to a new function which could be called
> by another caller.
>
> Regards,
> CK.
>
Current mtk_dither_set() cast dev data to struct mtk_ddp_comp_dev. But
mtk_disp_gamma in next patch would also call this function. But it's
dev data is struct mtk_disp_gamma, which is different, so we can't
cast to mtk_ddp_comp_dev. I separate the necessary parameters (regs,
cmdq_reg) out, so both component dither and gamma can both call this
separated function.
This is similar to the mtk_gamma_set_common() in the next patch, which
gamma and aal both used.
> >
> > Signed-off-by: Hsin-Yi Wang <hsinyi@...omium.org>
> > ---
> > drivers/gpu/drm/mediatek/mtk_disp_drv.h | 4 ++++
> > drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.c | 25 +++++++++++++--------
> > 2 files changed, 20 insertions(+), 9 deletions(-)
> >
> > diff --git a/drivers/gpu/drm/mediatek/mtk_disp_drv.h b/drivers/gpu/drm/mediatek/mtk_disp_drv.h
> > index 46d199b7b4a29..c50d5fc9fd349 100644
> > --- a/drivers/gpu/drm/mediatek/mtk_disp_drv.h
> > +++ b/drivers/gpu/drm/mediatek/mtk_disp_drv.h
> > @@ -17,6 +17,10 @@ void mtk_color_config(struct device *dev, unsigned int w,
> > unsigned int bpc, struct cmdq_pkt *cmdq_pkt);
> > void mtk_color_start(struct device *dev);
> >
> > +void mtk_dither_set_common(void __iomem *regs, struct cmdq_client_reg *cmdq_reg,
> > + unsigned int bpc, unsigned int CFG,
> > + struct cmdq_pkt *cmdq_pkt);
> > +
> > void mtk_dpi_start(struct device *dev);
> > void mtk_dpi_stop(struct device *dev);
> >
> > diff --git a/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.c b/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.c
> > index 7b5293429426d..53d25823a37cc 100644
> > --- a/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.c
> > +++ b/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.c
> > @@ -151,33 +151,40 @@ static void mtk_ddp_clk_disable(struct device *dev)
> > clk_disable_unprepare(priv->clk);
> > }
> >
> > -static void mtk_dither_set(struct device *dev, unsigned int bpc,
> > - unsigned int CFG, struct cmdq_pkt *cmdq_pkt)
> > -{
> > - struct mtk_ddp_comp_dev *priv = dev_get_drvdata(dev);
> >
> > +void mtk_dither_set_common(void __iomem *regs, struct cmdq_client_reg *cmdq_reg,
> > + unsigned int bpc, unsigned int CFG, struct cmdq_pkt *cmdq_pkt)
> > +{
> > /* If bpc equal to 0, the dithering function didn't be enabled */
> > if (bpc == 0)
> > return;
> >
> > if (bpc >= MTK_MIN_BPC) {
> > - mtk_ddp_write(cmdq_pkt, 0, &priv->cmdq_reg, priv->regs, DISP_DITHER_5);
> > - mtk_ddp_write(cmdq_pkt, 0, &priv->cmdq_reg, priv->regs, DISP_DITHER_7);
> > + mtk_ddp_write(cmdq_pkt, 0, cmdq_reg, regs, DISP_DITHER_5);
> > + mtk_ddp_write(cmdq_pkt, 0, cmdq_reg, regs, DISP_DITHER_7);
> > mtk_ddp_write(cmdq_pkt,
> > DITHER_LSB_ERR_SHIFT_R(MTK_MAX_BPC - bpc) |
> > DITHER_ADD_LSHIFT_R(MTK_MAX_BPC - bpc) |
> > DITHER_NEW_BIT_MODE,
> > - &priv->cmdq_reg, priv->regs, DISP_DITHER_15);
> > + cmdq_reg, regs, DISP_DITHER_15);
> > mtk_ddp_write(cmdq_pkt,
> > DITHER_LSB_ERR_SHIFT_B(MTK_MAX_BPC - bpc) |
> > DITHER_ADD_LSHIFT_B(MTK_MAX_BPC - bpc) |
> > DITHER_LSB_ERR_SHIFT_G(MTK_MAX_BPC - bpc) |
> > DITHER_ADD_LSHIFT_G(MTK_MAX_BPC - bpc),
> > - &priv->cmdq_reg, priv->regs, DISP_DITHER_16);
> > - mtk_ddp_write(cmdq_pkt, DISP_DITHERING, &priv->cmdq_reg, priv->regs, CFG);
> > + cmdq_reg, regs, DISP_DITHER_16);
> > + mtk_ddp_write(cmdq_pkt, DISP_DITHERING, cmdq_reg, regs, CFG);
> > }
> > }
> >
> > +static void mtk_dither_set(struct device *dev, unsigned int bpc,
> > + unsigned int CFG, struct cmdq_pkt *cmdq_pkt)
> > +{
> > + struct mtk_ddp_comp_dev *priv = dev_get_drvdata(dev);
> > +
> > + mtk_dither_set_common(priv->regs, &priv->cmdq_reg, bpc, CFG, cmdq_pkt);
> > +}
> > +
> > static void mtk_od_config(struct device *dev, unsigned int w,
> > unsigned int h, unsigned int vrefresh,
> > unsigned int bpc, struct cmdq_pkt *cmdq_pkt)
>
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