From mboxrd@z Thu Jan 1 00:00:00 1970 Return-path: Received: from out20-87.mail.aliyun.com ([115.124.20.87]:34566 "EHLO out20-87.mail.aliyun.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751594AbdGaBs1 (ORCPT ); Sun, 30 Jul 2017 21:48:27 -0400 Date: Mon, 31 Jul 2017 09:48:06 +0800 From: Yong To: Baruch Siach Cc: Maxime Ripard , Mauro Carvalho Chehab , Rob Herring , Mark Rutland , Chen-Yu Tsai , Greg Kroah-Hartman , "David S. Miller" , Hans Verkuil , Arnd Bergmann , Hugues Fruchet , Yannick Fertre , Philipp Zabel , Benoit Parrot , Benjamin Gaignard , Jean-Christophe Trotin , Ramesh Shanmugasundaram , Minghsiu Tsai , Krzysztof Kozlowski , Robert Jarzmik , linux-media@vger.kernel.org, devicetree@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, linux-sunxi@googlegroups.com Subject: Re: [PATCH v2 1/3] media: V3s: Add support for Allwinner CSI. Message-Id: <20170731094806.88c3188576d7e2c14b5e3e33@magewell.com> In-Reply-To: <20170730060801.bkc2kvm72ktixy74@tarshish> References: <1501131697-1359-1-git-send-email-yong.deng@magewell.com> <1501131697-1359-2-git-send-email-yong.deng@magewell.com> <20170728160233.xooevio4hoqkgfaq@flea.lan> <20170730060801.bkc2kvm72ktixy74@tarshish> Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Sender: linux-media-owner@vger.kernel.org List-ID: Hi, On Sun, 30 Jul 2017 09:08:01 +0300 Baruch Siach wrote: > Hi Maxime, Yong, > > On Fri, Jul 28, 2017 at 06:02:33PM +0200, Maxime Ripard wrote: > > Hi, > > > > Thanks for the second iteration! > > > > On Thu, Jul 27, 2017 at 01:01:35PM +0800, Yong Deng wrote: > > > Allwinner V3s SoC have two CSI module. CSI0 is used for MIPI interface > > > and CSI1 is used for parallel interface. This is not documented in > > > datasheet but by testing and guess. > > > > > > This patch implement a v4l2 framework driver for it. > > > > > > Currently, the driver only support the parallel interface. MIPI-CSI2, > > > ISP's support are not included in this patch. > > > > > > Signed-off-by: Yong Deng > > [...] > > > > +#ifdef DEBUG > > > +static void sun6i_csi_dump_regs(struct sun6i_csi_dev *sdev) > > > +{ > > > + struct regmap *regmap = sdev->regmap; > > > + u32 val; > > > + > > > + regmap_read(regmap, CSI_EN_REG, &val); > > > + printk("CSI_EN_REG=0x%x\n", val); > > > + regmap_read(regmap, CSI_IF_CFG_REG, &val); > > > + printk("CSI_IF_CFG_REG=0x%x\n", val); > > > + regmap_read(regmap, CSI_CAP_REG, &val); > > > + printk("CSI_CAP_REG=0x%x\n", val); > > > + regmap_read(regmap, CSI_SYNC_CNT_REG, &val); > > > + printk("CSI_SYNC_CNT_REG=0x%x\n", val); > > > + regmap_read(regmap, CSI_FIFO_THRS_REG, &val); > > > + printk("CSI_FIFO_THRS_REG=0x%x\n", val); > > > + regmap_read(regmap, CSI_PTN_LEN_REG, &val); > > > + printk("CSI_PTN_LEN_REG=0x%x\n", val); > > > + regmap_read(regmap, CSI_PTN_ADDR_REG, &val); > > > + printk("CSI_PTN_ADDR_REG=0x%x\n", val); > > > + regmap_read(regmap, CSI_VER_REG, &val); > > > + printk("CSI_VER_REG=0x%x\n", val); > > > + regmap_read(regmap, CSI_CH_CFG_REG, &val); > > > + printk("CSI_CH_CFG_REG=0x%x\n", val); > > > + regmap_read(regmap, CSI_CH_SCALE_REG, &val); > > > + printk("CSI_CH_SCALE_REG=0x%x\n", val); > > > + regmap_read(regmap, CSI_CH_F0_BUFA_REG, &val); > > > + printk("CSI_CH_F0_BUFA_REG=0x%x\n", val); > > > + regmap_read(regmap, CSI_CH_F1_BUFA_REG, &val); > > > + printk("CSI_CH_F1_BUFA_REG=0x%x\n", val); > > > + regmap_read(regmap, CSI_CH_F2_BUFA_REG, &val); > > > + printk("CSI_CH_F2_BUFA_REG=0x%x\n", val); > > > + regmap_read(regmap, CSI_CH_STA_REG, &val); > > > + printk("CSI_CH_STA_REG=0x%x\n", val); > > > + regmap_read(regmap, CSI_CH_INT_EN_REG, &val); > > > + printk("CSI_CH_INT_EN_REG=0x%x\n", val); > > > + regmap_read(regmap, CSI_CH_INT_STA_REG, &val); > > > + printk("CSI_CH_INT_STA_REG=0x%x\n", val); > > > + regmap_read(regmap, CSI_CH_FLD1_VSIZE_REG, &val); > > > + printk("CSI_CH_FLD1_VSIZE_REG=0x%x\n", val); > > > + regmap_read(regmap, CSI_CH_HSIZE_REG, &val); > > > + printk("CSI_CH_HSIZE_REG=0x%x\n", val); > > > + regmap_read(regmap, CSI_CH_VSIZE_REG, &val); > > > + printk("CSI_CH_VSIZE_REG=0x%x\n", val); > > > + regmap_read(regmap, CSI_CH_BUF_LEN_REG, &val); > > > + printk("CSI_CH_BUF_LEN_REG=0x%x\n", val); > > > + regmap_read(regmap, CSI_CH_FLIP_SIZE_REG, &val); > > > + printk("CSI_CH_FLIP_SIZE_REG=0x%x\n", val); > > > + regmap_read(regmap, CSI_CH_FRM_CLK_CNT_REG, &val); > > > + printk("CSI_CH_FRM_CLK_CNT_REG=0x%x\n", val); > > > + regmap_read(regmap, CSI_CH_ACC_ITNL_CLK_CNT_REG, &val); > > > + printk("CSI_CH_ACC_ITNL_CLK_CNT_REG=0x%x\n", val); > > > + regmap_read(regmap, CSI_CH_FIFO_STAT_REG, &val); > > > + printk("CSI_CH_FIFO_STAT_REG=0x%x\n", val); > > > + regmap_read(regmap, CSI_CH_PCLK_STAT_REG, &val); > > > + printk("CSI_CH_PCLK_STAT_REG=0x%x\n", val); > > > +} > > > +#endif > > > > You can already dump a regmap through debugfs, that's redundant. > > The advantage of in-code registers dump routine is the ability to synchronize > the snapshot with the driver code execution. This is particularly important > for the capture statistics registers. I have found it useful here. Agree. It is not used to expose the registers value to user space. If you think it is redundant, I will delete it. > > [...] > > > > +static int update_buf_addr(struct sun6i_csi *csi, dma_addr_t addr) > > > +{ > > > + struct sun6i_csi_dev *sdev = sun6i_csi_to_dev(csi); > > > + /* transform physical address to bus address */ > > > + dma_addr_t bus_addr = addr - 0x40000000; > > > > Like Baruch noticed, you should use PHYS_OFFSET here. The A80 for > > example has a different RAM base address. > > > > > + > > > + regmap_write(sdev->regmap, CSI_CH_F0_BUFA_REG, > > > + (bus_addr + sdev->planar_offset[0]) >> 2); > > Why do you need the bit shift? Does that work for you? > > The User Manuals of both the V3s and the and the A33 (AKA R16) state that the > BUFA field size in this register is 31:00, that is 32bit. I have found no > indication of this bit shift in the Olimex provided sunxi-vfe[1] driver. On > the A33 I have found that only after removing the bit-shift, (some sort of) > data started to appear in the buffer. > > [1] https://github.com/hehopmajieh/a33_linux/tree/master/drivers/media/video/sunxi-vfe > The Users Manuals do not document this bit shift. You should see line 10 to 32 in https://github.com/hehopmajieh/a33_linux/blob/master/drivers/media/video/sunxi-vfe/csi/csi_reg.c > [...] > > > > +static irqreturn_t sun6i_csi_isr(int irq, void *dev_id) > > > +{ > > > + struct sun6i_csi_dev *sdev = (struct sun6i_csi_dev *)dev_id; > > > + struct regmap *regmap = sdev->regmap; > > > + u32 status; > > > + > > > + regmap_read(regmap, CSI_CH_INT_STA_REG, &status); > > > + > > > + if ((status & CSI_CH_INT_STA_FIFO0_OF_PD) || > > > + (status & CSI_CH_INT_STA_FIFO1_OF_PD) || > > > + (status & CSI_CH_INT_STA_FIFO2_OF_PD) || > > > + (status & CSI_CH_INT_STA_HB_OF_PD)) { > > > + regmap_write(regmap, CSI_CH_INT_STA_REG, status); > > > + regmap_update_bits(regmap, CSI_EN_REG, CSI_EN_CSI_EN, 0); > > > + regmap_update_bits(regmap, CSI_EN_REG, CSI_EN_CSI_EN, > > > + CSI_EN_CSI_EN); > > > > You need to enable / disable it at every frame? How do you deal with > > double buffering? (or did you choose to ignore it for now?) > > These *_OF_PD status bits indicate an overflow error condition. Right. > > > > + return IRQ_HANDLED; > > > + } > > > + > > > + if (status & CSI_CH_INT_STA_FD_PD) { > > > + sun6i_video_frame_done(&sdev->csi.video); > > > + } > > > + > > > + regmap_write(regmap, CSI_CH_INT_STA_REG, status); > > > > Isn't it redundant with the one you did in the condition a bit above? > > > > You should also check that your device indeed generated an > > interrupt. In the occurence of a spourious interrupt, your code will > > return IRQ_HANDLED, which is the wrong thing to do. > > > > I think you should reverse your logic a bit here to make this > > easier. You should just check that your status flags are indeed set, > > and if not just bail out and return IRQ_NONE. > > > > And if they are, go on with treating your interrupt. > > > > > + > > > + return IRQ_HANDLED; > > > +} > > baruch > > -- > http://baruch.siach.name/blog/ ~. .~ Tk Open Systems > =}------------------------------------------------ooO--U--Ooo------------{= > - baruch@tkos.co.il - tel: +972.52.368.4656, http://www.tkos.co.il - Thanks, Yong