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Tue, 21 Apr 2020 06:59:09 -0700 (PDT) Date: Tue, 21 Apr 2020 15:59:07 +0200 From: Daniel Vetter To: Neil Armstrong Subject: Re: [PATCH] drm/meson: add mode selection limits against specific SoC revisions Message-ID: <20200421135907.GC3456981@phenom.ffwll.local> Mail-Followup-To: Neil Armstrong , dri-devel@lists.freedesktop.org, linux-amlogic@lists.infradead.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org References: <20200421134410.30603-1-narmstrong@baylibre.com> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <20200421134410.30603-1-narmstrong@baylibre.com> X-Operating-System: Linux phenom 5.3.0-3-amd64 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20200421_065915_139009_DE50C15F X-CRM114-Status: GOOD ( 25.06 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: linux-arm-kernel@lists.infradead.org, linux-amlogic@lists.infradead.org, linux-kernel@vger.kernel.org, dri-devel@lists.freedesktop.org Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org On Tue, Apr 21, 2020 at 03:44:10PM +0200, Neil Armstrong wrote: > The Amlogic S805X/Y uses the same die as the S905X, but with more > limited graphics capabilities. > > This adds a soc version detection adding specific limitations on the HDMI > mode selections. > > Here, we limit to HDMI 1.3a max HDMI PHY clock frequency. > > Signed-off-by: Neil Armstrong Just a drive-by, but the code organization between the dw-hdmi bridge and the driver looks pretty terribly and really leaky. Can't we do better? Either by fixing the dw-hdmi bridge abstraction to actually abstract something, or by givin up the dw-hdmi is a bridge and convert it to some helper to implement a drm_encoder. Current status just doesn't make too much sense to me. -Daniel > --- > drivers/gpu/drm/meson/meson_drv.c | 29 ++++++++++++++++++++++++++- > drivers/gpu/drm/meson/meson_drv.h | 6 ++++++ > drivers/gpu/drm/meson/meson_dw_hdmi.c | 7 +++++++ > 3 files changed, 41 insertions(+), 1 deletion(-) > > diff --git a/drivers/gpu/drm/meson/meson_drv.c b/drivers/gpu/drm/meson/meson_drv.c > index 6f29fab79952..621f6de0f076 100644 > --- a/drivers/gpu/drm/meson/meson_drv.c > +++ b/drivers/gpu/drm/meson/meson_drv.c > @@ -11,6 +11,7 @@ > #include > #include > #include > +#include > #include > #include > > @@ -183,6 +184,24 @@ static void meson_remove_framebuffers(void) > kfree(ap); > } > > +struct meson_drm_soc_attr { > + struct meson_drm_soc_limits limits; > + const struct soc_device_attribute *attrs; > +}; > + > +static const struct meson_drm_soc_attr meson_drm_soc_attrs[] = { > + /* S805X/S805Y HDMI PLL won't lock for HDMI PHY freq > 1,65GHz */ > + { > + .limits = { > + .max_hdmi_phy_freq = 1650000, > + }, > + .attrs = (const struct soc_device_attribute []) { > + { .soc_id = "GXL (S805*)", }, > + { /* sentinel */ }, > + } > + }, > +}; > + > static int meson_drv_bind_master(struct device *dev, bool has_components) > { > struct platform_device *pdev = to_platform_device(dev); > @@ -191,7 +210,7 @@ static int meson_drv_bind_master(struct device *dev, bool has_components) > struct drm_device *drm; > struct resource *res; > void __iomem *regs; > - int ret; > + int ret, i; > > /* Checks if an output connector is available */ > if (!meson_vpu_has_available_connectors(dev)) { > @@ -281,6 +300,14 @@ static int meson_drv_bind_master(struct device *dev, bool has_components) > if (ret) > goto free_drm; > > + /* Assign limits per soc revision/package */ > + for (i = 0 ; i < ARRAY_SIZE(meson_drm_soc_attrs) ; ++i) { > + if (soc_device_match(meson_drm_soc_attrs[i].attrs)) { > + priv->limits = &meson_drm_soc_attrs[i].limits; > + break; > + } > + } > + > /* Remove early framebuffers (ie. simplefb) */ > meson_remove_framebuffers(); > > diff --git a/drivers/gpu/drm/meson/meson_drv.h b/drivers/gpu/drm/meson/meson_drv.h > index 04fdf3826643..5b23704a80d6 100644 > --- a/drivers/gpu/drm/meson/meson_drv.h > +++ b/drivers/gpu/drm/meson/meson_drv.h > @@ -30,6 +30,10 @@ struct meson_drm_match_data { > struct meson_afbcd_ops *afbcd_ops; > }; > > +struct meson_drm_soc_limits { > + unsigned int max_hdmi_phy_freq; > +}; > + > struct meson_drm { > struct device *dev; > enum vpu_compatible compat; > @@ -48,6 +52,8 @@ struct meson_drm { > struct drm_plane *primary_plane; > struct drm_plane *overlay_plane; > > + const struct meson_drm_soc_limits *limits; > + > /* Components Data */ > struct { > bool osd1_enabled; > diff --git a/drivers/gpu/drm/meson/meson_dw_hdmi.c b/drivers/gpu/drm/meson/meson_dw_hdmi.c > index e8c94915a4fc..dc3d5122475a 100644 > --- a/drivers/gpu/drm/meson/meson_dw_hdmi.c > +++ b/drivers/gpu/drm/meson/meson_dw_hdmi.c > @@ -695,6 +695,13 @@ dw_hdmi_mode_valid(struct drm_connector *connector, > dev_dbg(connector->dev->dev, "%s: vclk:%d phy=%d venc=%d hdmi=%d\n", > __func__, phy_freq, vclk_freq, venc_freq, hdmi_freq); > > + /* Check against soc revision/package limits */ > + if (priv->limits) { > + if (priv->limits->max_hdmi_phy_freq && > + phy_freq > priv->limits->max_hdmi_phy_freq) > + return MODE_CLOCK_HIGH; > + } > + > return meson_vclk_vic_supported_freq(phy_freq, vclk_freq); > } > > -- > 2.22.0 > > _______________________________________________ > dri-devel mailing list > dri-devel@lists.freedesktop.org > https://lists.freedesktop.org/mailman/listinfo/dri-devel -- Daniel Vetter Software Engineer, Intel Corporation http://blog.ffwll.ch _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel