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SubjectRe: [PATCH V6 8/8] drm/mediatek: fix the rate of parent for hdmi phy in MT2701
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Hi, Wangyan:

On Mon, 2019-02-25 at 10:09 +0800, wangyan wang wrote:
> From: chunhui dai <chunhui.dai@mediatek.com>
>
> We should not change the rate of parent for hdmi phy when
> doing round_rate for this clock. The parent clock of hdmi
> phy must be the same as it. We change it when doing set_rate
> only.
>
> Signed-off-by: chunhui dai <chunhui.dai@mediatek.com>
> Signed-off-by: wangyan wang <wangyan.wang@mediatek.com>
> ---
> drivers/gpu/drm/mediatek/mtk_hdmi_phy.c | 14 --------------
> drivers/gpu/drm/mediatek/mtk_hdmi_phy.h | 3 ---
> drivers/gpu/drm/mediatek/mtk_mt2701_hdmi_phy.c | 11 +++++++++++
> drivers/gpu/drm/mediatek/mtk_mt8173_hdmi_phy.c | 14 ++++++++++++++
> 4 files changed, 25 insertions(+), 17 deletions(-)
>
> diff --git a/drivers/gpu/drm/mediatek/mtk_hdmi_phy.c b/drivers/gpu/drm/mediatek/mtk_hdmi_phy.c
> index 370309d684ec..ca8bc1489f37 100644
> --- a/drivers/gpu/drm/mediatek/mtk_hdmi_phy.c
> +++ b/drivers/gpu/drm/mediatek/mtk_hdmi_phy.c
> @@ -15,20 +15,6 @@ static const struct phy_ops mtk_hdmi_phy_dev_ops = {
> .owner = THIS_MODULE,
> };
>
> -long mtk_hdmi_pll_round_rate(struct clk_hw *hw, unsigned long rate,
> - unsigned long *parent_rate)
> -{
> - struct mtk_hdmi_phy *hdmi_phy = to_mtk_hdmi_phy(hw);
> -
> - hdmi_phy->pll_rate = rate;
> - if (rate <= 74250000)
> - *parent_rate = rate;
> - else
> - *parent_rate = rate / 2;
> -
> - return rate;
> -}
> -
> u32 mtk_hdmi_phy_read(struct mtk_hdmi_phy *hdmi_phy, u32 offset)
> {
> return readl(hdmi_phy->regs + offset);
> diff --git a/drivers/gpu/drm/mediatek/mtk_hdmi_phy.h b/drivers/gpu/drm/mediatek/mtk_hdmi_phy.h
> index 446e2acd1926..c6061ad15ff0 100644
> --- a/drivers/gpu/drm/mediatek/mtk_hdmi_phy.h
> +++ b/drivers/gpu/drm/mediatek/mtk_hdmi_phy.h
> @@ -50,9 +50,6 @@ void mtk_hdmi_phy_set_bits(struct mtk_hdmi_phy *hdmi_phy, u32 offset,
> void mtk_hdmi_phy_mask(struct mtk_hdmi_phy *hdmi_phy, u32 offset,
> u32 val, u32 mask);
> 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);
> -
> extern struct platform_driver mtk_hdmi_phy_driver;
> extern struct mtk_hdmi_phy_conf mtk_hdmi_phy_8173_conf;
> extern struct mtk_hdmi_phy_conf mtk_hdmi_phy_2701_conf;
> diff --git a/drivers/gpu/drm/mediatek/mtk_mt2701_hdmi_phy.c b/drivers/gpu/drm/mediatek/mtk_mt2701_hdmi_phy.c
> index 88dd9e812ca0..33893a180c2e 100644
> --- a/drivers/gpu/drm/mediatek/mtk_mt2701_hdmi_phy.c
> +++ b/drivers/gpu/drm/mediatek/mtk_mt2701_hdmi_phy.c
> @@ -152,6 +152,17 @@ static int mtk_hdmi_pll_set_rate(struct clk_hw *hw, unsigned long rate,
> RG_HDMITX_DRV_IBIAS_MASK);
> return 0;
> }
> +
> +static long mtk_hdmi_pll_round_rate(struct clk_hw *hw, unsigned long rate,
> + unsigned long *parent_rate)
> +{
> + struct mtk_hdmi_phy *hdmi_phy = to_mtk_hdmi_phy(hw);
> +
> + hdmi_phy->pll_rate = rate;

I think you don't need to save the rate into pll_rate here, pll_rate
would be set in set_rate() or recalc_rate().

Regards,
CK

> +
> + return rate;
> +}
> +
> static unsigned long mtk_hdmi_pll_recalc_rate(struct clk_hw *hw,
> unsigned long parent_rate)
> {
> diff --git a/drivers/gpu/drm/mediatek/mtk_mt8173_hdmi_phy.c b/drivers/gpu/drm/mediatek/mtk_mt8173_hdmi_phy.c
> index 63dde42521b8..3a339f516613 100644
> --- a/drivers/gpu/drm/mediatek/mtk_mt8173_hdmi_phy.c
> +++ b/drivers/gpu/drm/mediatek/mtk_mt8173_hdmi_phy.c
> @@ -285,6 +285,20 @@ static int mtk_hdmi_pll_set_rate(struct clk_hw *hw, unsigned long rate,
> return 0;
> }
>
> +static long mtk_hdmi_pll_round_rate(struct clk_hw *hw, unsigned long rate,
> + unsigned long *parent_rate)
> +{
> + struct mtk_hdmi_phy *hdmi_phy = to_mtk_hdmi_phy(hw);
> +
> + hdmi_phy->pll_rate = rate;
> + if (rate <= 74250000)
> + *parent_rate = rate;
> + else
> + *parent_rate = rate / 2;
> +
> + return rate;
> +}
> +
> static unsigned long mtk_hdmi_pll_recalc_rate(struct clk_hw *hw,
> unsigned long parent_rate)
> {


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