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Date: Tue, 9 Apr 2019 13:40:34 +0800
From: CK Hu <ck.hu@...iatek.com>
To: wangyan wang <wangyan.wang@...iatek.com>
CC: Michael Turquette <mturquette@...libre.com>,
Stephen Boyd <sboyd@...nel.org>,
Matthias Brugger <matthias.bgg@...il.com>,
"Philipp Zabel" <p.zabel@...gutronix.de>,
David Airlie <airlied@...ux.ie>,
"Daniel Vetter" <daniel@...ll.ch>,
chunhui dai <chunhui.dai@...iatek.com>,
"Colin Ian King" <colin.king@...onical.com>,
Sean Wang <sean.wang@...iatek.com>,
"Ryder Lee" <ryder.lee@...iatek.com>, <linux-clk@...r.kernel.org>,
<linux-kernel@...r.kernel.org>,
<linux-arm-kernel@...ts.infradead.org>,
<linux-mediatek@...ts.infradead.org>,
<dri-devel@...ts.freedesktop.org>, <srv_heupstream@...iatek.com>
Subject: Re: [PATCH V9 4/5] drm/mediatek: make implementation of
recalc_rate() to match the definition
Hi, Wangyan:
On Tue, 2019-04-09 at 11:07 +0800, wangyan wang wrote:
> From: Wangyan Wang <wangyan.wang@...iatek.com>
>
> Recalculate the rate of this clock, by querying hardware to
> make implementation of recalc_rate() to match the definition.
>
> Signed-off-by: Wangyan Wang <wangyan.wang@...iatek.com>
> ---
> drivers/gpu/drm/mediatek/mtk_hdmi_phy.c | 8 ------
> drivers/gpu/drm/mediatek/mtk_hdmi_phy.h | 2 --
> drivers/gpu/drm/mediatek/mtk_mt2701_hdmi_phy.c | 39 +++++++++++++++++++++++---
> drivers/gpu/drm/mediatek/mtk_mt8173_hdmi_phy.c | 8 ++++++
> 4 files changed, 43 insertions(+), 14 deletions(-)
>
> diff --git a/drivers/gpu/drm/mediatek/mtk_hdmi_phy.c b/drivers/gpu/drm/mediatek/mtk_hdmi_phy.c
> index 0879ce47d4c5..9e153e080739 100644
> --- a/drivers/gpu/drm/mediatek/mtk_hdmi_phy.c
> +++ b/drivers/gpu/drm/mediatek/mtk_hdmi_phy.c
> @@ -29,14 +29,6 @@ long mtk_hdmi_pll_round_rate(struct clk_hw *hw, unsigned long rate,
> return rate;
> }
>
> -unsigned long mtk_hdmi_pll_recalc_rate(struct clk_hw *hw,
> - unsigned long parent_rate)
> -{
> - struct mtk_hdmi_phy *hdmi_phy = to_mtk_hdmi_phy(hw);
> -
> - return hdmi_phy->pll_rate;
> -}
> -
> void mtk_hdmi_phy_clear_bits(struct mtk_hdmi_phy *hdmi_phy, u32 offset,
> u32 bits)
> {
> diff --git a/drivers/gpu/drm/mediatek/mtk_hdmi_phy.h b/drivers/gpu/drm/mediatek/mtk_hdmi_phy.h
> index 0045824c1be9..d28b8d5ed2b4 100644
> --- a/drivers/gpu/drm/mediatek/mtk_hdmi_phy.h
> +++ b/drivers/gpu/drm/mediatek/mtk_hdmi_phy.h
> @@ -51,8 +51,6 @@ void mtk_hdmi_phy_mask(struct mtk_hdmi_phy *hdmi_phy, u32 offset,
> struct mtk_hdmi_phy *to_mtk_hdmi_phy(struct clk_hw *hw);
> long mtk_hdmi_pll_round_rate(struct clk_hw *hw, unsigned long rate,
> unsigned long *parent_rate);
> -unsigned long mtk_hdmi_pll_recalc_rate(struct clk_hw *hw,
> - unsigned long parent_rate);
>
> extern struct platform_driver mtk_hdmi_phy_driver;
> extern struct mtk_hdmi_phy_conf mtk_hdmi_phy_8173_conf;
> diff --git a/drivers/gpu/drm/mediatek/mtk_mt2701_hdmi_phy.c b/drivers/gpu/drm/mediatek/mtk_mt2701_hdmi_phy.c
> index 844e622f052c..b24ea6651db4 100644
> --- a/drivers/gpu/drm/mediatek/mtk_mt2701_hdmi_phy.c
> +++ b/drivers/gpu/drm/mediatek/mtk_mt2701_hdmi_phy.c
> @@ -79,7 +79,6 @@ static int mtk_hdmi_pll_prepare(struct clk_hw *hw)
> mtk_hdmi_phy_set_bits(hdmi_phy, HDMI_CON0, RG_HDMITX_EN_SLDO_MASK);
> usleep_range(80, 100);
> mtk_hdmi_phy_set_bits(hdmi_phy, HDMI_CON2, RG_HDMITX_MBIAS_LPF_EN);
> - mtk_hdmi_phy_set_bits(hdmi_phy, HDMI_CON2, RG_HDMITX_EN_TX_POSDIV);
> mtk_hdmi_phy_set_bits(hdmi_phy, HDMI_CON0, RG_HDMITX_EN_SER_MASK);
> mtk_hdmi_phy_set_bits(hdmi_phy, HDMI_CON0, RG_HDMITX_EN_PRED_MASK);
> mtk_hdmi_phy_set_bits(hdmi_phy, HDMI_CON0, RG_HDMITX_EN_DRV_MASK);
> @@ -94,7 +93,6 @@ static void mtk_hdmi_pll_unprepare(struct clk_hw *hw)
> mtk_hdmi_phy_clear_bits(hdmi_phy, HDMI_CON0, RG_HDMITX_EN_DRV_MASK);
> mtk_hdmi_phy_clear_bits(hdmi_phy, HDMI_CON0, RG_HDMITX_EN_PRED_MASK);
> mtk_hdmi_phy_clear_bits(hdmi_phy, HDMI_CON0, RG_HDMITX_EN_SER_MASK);
> - mtk_hdmi_phy_clear_bits(hdmi_phy, HDMI_CON2, RG_HDMITX_EN_TX_POSDIV);
> mtk_hdmi_phy_clear_bits(hdmi_phy, HDMI_CON2, RG_HDMITX_MBIAS_LPF_EN);
> usleep_range(80, 100);
> mtk_hdmi_phy_clear_bits(hdmi_phy, HDMI_CON0, RG_HDMITX_EN_SLDO_MASK);
> @@ -123,6 +121,7 @@ static int mtk_hdmi_pll_set_rate(struct clk_hw *hw, unsigned long rate,
>
> mtk_hdmi_phy_set_bits(hdmi_phy, HDMI_CON6, RG_HTPLL_PREDIV_MASK);
> mtk_hdmi_phy_set_bits(hdmi_phy, HDMI_CON6, RG_HTPLL_POSDIV_MASK);
> + mtk_hdmi_phy_set_bits(hdmi_phy, HDMI_CON2, RG_HDMITX_EN_TX_POSDIV);
> mtk_hdmi_phy_mask(hdmi_phy, HDMI_CON6, (0x1 << RG_HTPLL_IC),
> RG_HTPLL_IC_MASK);
> mtk_hdmi_phy_mask(hdmi_phy, HDMI_CON6, (0x1 << RG_HTPLL_IR),
> @@ -154,6 +153,40 @@ static int mtk_hdmi_pll_set_rate(struct clk_hw *hw, unsigned long rate,
> return 0;
> }
>
> +static unsigned long mtk_hdmi_pll_recalc_rate(struct clk_hw *hw,
> + unsigned long parent_rate)
I think you've tried to align, but the result looks not aligned. Make
sure your editor have equal size for each character and the 'tab' length
is 8 character.
Regards,
CK
> +
> +{
> + struct mtk_hdmi_phy *hdmi_phy = to_mtk_hdmi_phy(hw);
> + unsigned long out_rate, val;
> +
> + val = (readl(hdmi_phy->regs + HDMI_CON6)
> + & RG_HTPLL_PREDIV_MASK) >> RG_HTPLL_PREDIV;
> + switch (val) {
> + case 0x00:
> + out_rate = parent_rate;
> + break;
> + case 0x01:
> + out_rate = parent_rate / 2;
> + break;
> + default:
> + out_rate = parent_rate / 4;
> + break;
> + }
> +
> + val = (readl(hdmi_phy->regs + HDMI_CON6)
> + & RG_HTPLL_FBKDIV_MASK) >> RG_HTPLL_FBKDIV;
> + out_rate *= (val + 1) * 2;
> + val = (readl(hdmi_phy->regs + HDMI_CON2)
> + & RG_HDMITX_TX_POSDIV_MASK);
> +
> + out_rate >>= (val >> RG_HDMITX_TX_POSDIV);
> +
> + if (readl(hdmi_phy->regs + HDMI_CON2) & RG_HDMITX_EN_TX_POSDIV)
> + out_rate = out_rate / 5;
> +
> + return out_rate;
> +}
> +
> static const struct clk_ops mtk_hdmi_phy_pll_ops = {
> .prepare = mtk_hdmi_pll_prepare,
> .unprepare = mtk_hdmi_pll_unprepare,
> @@ -174,7 +207,6 @@ static void mtk_hdmi_phy_enable_tmds(struct mtk_hdmi_phy *hdmi_phy)
> mtk_hdmi_phy_set_bits(hdmi_phy, HDMI_CON0, RG_HDMITX_EN_SLDO_MASK);
> usleep_range(80, 100);
> mtk_hdmi_phy_set_bits(hdmi_phy, HDMI_CON2, RG_HDMITX_MBIAS_LPF_EN);
> - mtk_hdmi_phy_set_bits(hdmi_phy, HDMI_CON2, RG_HDMITX_EN_TX_POSDIV);
> mtk_hdmi_phy_set_bits(hdmi_phy, HDMI_CON0, RG_HDMITX_EN_SER_MASK);
> mtk_hdmi_phy_set_bits(hdmi_phy, HDMI_CON0, RG_HDMITX_EN_PRED_MASK);
> mtk_hdmi_phy_set_bits(hdmi_phy, HDMI_CON0, RG_HDMITX_EN_DRV_MASK);
> @@ -186,7 +218,6 @@ static void mtk_hdmi_phy_disable_tmds(struct mtk_hdmi_phy *hdmi_phy)
> mtk_hdmi_phy_clear_bits(hdmi_phy, HDMI_CON0, RG_HDMITX_EN_DRV_MASK);
> mtk_hdmi_phy_clear_bits(hdmi_phy, HDMI_CON0, RG_HDMITX_EN_PRED_MASK);
> mtk_hdmi_phy_clear_bits(hdmi_phy, HDMI_CON0, RG_HDMITX_EN_SER_MASK);
> - mtk_hdmi_phy_clear_bits(hdmi_phy, HDMI_CON2, RG_HDMITX_EN_TX_POSDIV);
> mtk_hdmi_phy_clear_bits(hdmi_phy, HDMI_CON2, RG_HDMITX_MBIAS_LPF_EN);
> usleep_range(80, 100);
> mtk_hdmi_phy_clear_bits(hdmi_phy, HDMI_CON0, RG_HDMITX_EN_SLDO_MASK);
> diff --git a/drivers/gpu/drm/mediatek/mtk_mt8173_hdmi_phy.c b/drivers/gpu/drm/mediatek/mtk_mt8173_hdmi_phy.c
> index f44066875dcd..625739b4e938 100644
> --- a/drivers/gpu/drm/mediatek/mtk_mt8173_hdmi_phy.c
> +++ b/drivers/gpu/drm/mediatek/mtk_mt8173_hdmi_phy.c
> @@ -285,6 +285,14 @@ static int mtk_hdmi_pll_set_rate(struct clk_hw *hw, unsigned long rate,
> return 0;
> }
>
> +unsigned long mtk_hdmi_pll_recalc_rate(struct clk_hw *hw,
> + unsigned long parent_rate)
> +
> +{
> + struct mtk_hdmi_phy *hdmi_phy = to_mtk_hdmi_phy(hw);
> +
> + return hdmi_phy->pll_rate;
> +}
> +
> static const struct clk_ops mtk_hdmi_phy_pll_ops = {
> .prepare = mtk_hdmi_pll_prepare,
> .unprepare = mtk_hdmi_pll_unprepare,
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