Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752698AbaKJKmG (ORCPT ); Mon, 10 Nov 2014 05:42:06 -0500 Received: from mail-yh0-f68.google.com ([209.85.213.68]:60572 "EHLO mail-yh0-f68.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751913AbaKJKmE (ORCPT ); Mon, 10 Nov 2014 05:42:04 -0500 From: Andy Yan To: airlied@linux.ie, Zubair.Kakakhel@imgtec.com, rmk+kernel@arm.linux.org.uk, fabio.estevam@freescale.com, heiko@sntech.de Cc: Andy Yan , Philipp Zabel , Shawn Guo , Greg Kroah-Hartman , dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org Subject: [PATCH v6 5/7] drm: bridge/dw-hdmi: add support for multi byte register width access Date: Mon, 10 Nov 2014 18:41:00 +0800 Message-Id: <1415616062-30583-6-git-send-email-andy.yan@rock-chips.com> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1415616062-30583-1-git-send-email-andy.yan@rock-chips.com> References: <1415616062-30583-1-git-send-email-andy.yan@rock-chips.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On rockchip rk3288, only word(32-bit) accesses are permitted for hdmi registers. Byte width accesses (writeb, readb) generate an imprecise external abort. Signed-off-by: Andy Yan --- Changes in v6: - move some modification to patch#6 - refactor register access without reg_shift Changes in v5: - refactor reg-io-width Changes in v4: None Changes in v3: - split multi register access to one indepent patch Changes in v2: None drivers/gpu/drm/bridge/dw_hdmi.c | 57 +++++++++++++++++++++++++++++++++++----- 1 file changed, 51 insertions(+), 6 deletions(-) diff --git a/drivers/gpu/drm/bridge/dw_hdmi.c b/drivers/gpu/drm/bridge/dw_hdmi.c index e9e73a7..c15c86e 100644 --- a/drivers/gpu/drm/bridge/dw_hdmi.c +++ b/drivers/gpu/drm/bridge/dw_hdmi.c @@ -100,6 +100,11 @@ struct hdmi_data_info { struct hdmi_vmode video_mode; }; +union dw_reg_ptr { + u32 __iomem *p32; + u8 __iomem *p8; +}; + struct dw_hdmi { struct drm_connector connector; struct drm_encoder encoder; @@ -122,20 +127,43 @@ struct dw_hdmi { struct regmap *regmap; struct i2c_adapter *ddc; - void __iomem *regs; + union dw_reg_ptr regs; unsigned int sample_rate; int ratio; + + void (*write)(struct dw_hdmi *hdmi, u8 val, int offset); + u8 (*read)(struct dw_hdmi *hdmi, int offset); }; +static void dw_hdmi_writel(struct dw_hdmi *hdmi, u8 val, int offset) +{ + writel(val, hdmi->regs.p32 + offset); +} + +static u8 dw_hdmi_readl(struct dw_hdmi *hdmi, int offset) +{ + return readl(hdmi->regs.p32 + offset); +} + +static void dw_hdmi_writeb(struct dw_hdmi *hdmi, u8 val, int offset) +{ + writeb(val, hdmi->regs.p8 + offset); +} + +static u8 dw_hdmi_readb(struct dw_hdmi *hdmi, int offset) +{ + return readb(hdmi->regs.p8 + offset); +} + static inline void hdmi_writeb(struct dw_hdmi *hdmi, u8 val, int offset) { - writeb(val, hdmi->regs + offset); + hdmi->write(hdmi, val, offset); } static inline u8 hdmi_readb(struct dw_hdmi *hdmi, int offset) { - return readb(hdmi->regs + offset); + return hdmi->read(hdmi, offset); } static void hdmi_modb(struct dw_hdmi *hdmi, u8 data, u8 mask, unsigned reg) @@ -1499,6 +1527,23 @@ static int dw_hdmi_bind(struct device *dev, struct device *master, void *data) struct device_node *ddc_node; struct resource *iores; int ret, irq; + u32 val = 1; + + of_property_read_u32(np, "reg-io-width", &val); + + switch (val) { + case 4: + hdmi->write = dw_hdmi_writel; + hdmi->read = dw_hdmi_readl; + break; + case 1: + hdmi->write = dw_hdmi_writeb; + hdmi->read = dw_hdmi_readb; + break; + default: + dev_err(dev, "reg-io-width must be 1 or 4\n"); + return -EINVAL; + } ddc_node = of_parse_phandle(np, "ddc-i2c-bus", 0); if (ddc_node) { @@ -1525,9 +1570,9 @@ static int dw_hdmi_bind(struct device *dev, struct device *master, void *data) return ret; iores = platform_get_resource(pdev, IORESOURCE_MEM, 0); - hdmi->regs = devm_ioremap_resource(dev, iores); - if (IS_ERR(hdmi->regs)) - return PTR_ERR(hdmi->regs); + hdmi->regs.p32 = devm_ioremap_resource(dev, iores); + if (IS_ERR(hdmi->regs.p32)) + return PTR_ERR(hdmi->regs.p32); if (hdmi->plat_data->setup) hdmi->priv = hdmi->plat_data->setup(pdev); -- 1.9.1 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/