Kevin, After sending out my last patch (moving clocks to ccdc driver), I thought of reworking it in similar lines. I will re-send the patch after incorporating this. Murali Karicheri Software Design Engineer Texas Instruments Inc. Germantown, MD 20874 phone: 301-407-9583 email: m-karicheri2@xxxxxx >-----Original Message----- >From: Kevin Hilman [mailto:khilman@xxxxxxxxxxxxxxxxxxx] >Sent: Wednesday, December 09, 2009 11:00 AM >To: Karicheri, Muralidharan >Cc: linux-media@xxxxxxxxxxxxxxx; hverkuil@xxxxxxxxx; davinci-linux-open- >source@xxxxxxxxxxxxxxxxxxxx; Hiremath, Vaibhav >Subject: Re: [PATCH - v1 1/2] V4L - vpfe capture - make clocks configurable > >m-karicheri2@xxxxxx writes: > >> From: Muralidharan Karicheri <m-karicheri2@xxxxxx> >> >> v1 - updated based on comments from Vaibhav Hiremath. >> >> On DM365 we use only vpss master clock, where as on DM355 and >> DM6446, we use vpss master and slave clocks for vpfe capture and AM3517 >> we use internal clock and pixel clock. So this patch makes it >configurable >> on a per platform basis. This is needed for supporting DM365 for which >patches >> will be available soon. >> >> Tested-by: Vaibhav Hiremath <hvaibhav@xxxxxx>, Muralidharan Karicheri <m- >karicheri2@xxxxxx> >> Acked-by: Vaibhav Hiremath <hvaibhav@xxxxxx> >> Signed-off-by: Muralidharan Karicheri <m-karicheri2@xxxxxx> > >Sorry for jumping late into this thread, but I have a couple comments. > >First, we should *never* pass clock names from platform code to driver >code. We have the clkdevs for this. Using clkdev, the right clock >is determined from the driver being used and any additional info. > >Rather than passing the strings along, you should add the driver name >to the 'dev_id' field of the clkdev node, and then use the 'con_id' field >to distinguish between the two clocks: > >- CLK(NULL, "vpss_master", &vpss_master_clk), >- CLK(NULL, "vpss_slave", &vpss_slave_clk), >+ CLK("vpfe-capture", "master", &vpss_master_clk), >+ CLK("vpfe-capture", "slave", &vpss_slave_clk), > >NOTE: this assumes clks are used from VPFE. When you move to CCDC, this >should change accordingly. > >More on the usage below... > > > >> --- >> drivers/media/video/davinci/vpfe_capture.c | 98 +++++++++++++++++----- >----- >> include/media/davinci/vpfe_capture.h | 11 ++- >> 2 files changed, 70 insertions(+), 39 deletions(-) >> >> diff --git a/drivers/media/video/davinci/vpfe_capture.c >b/drivers/media/video/davinci/vpfe_capture.c >> index 12a1b3d..c3468ee 100644 >> --- a/drivers/media/video/davinci/vpfe_capture.c >> +++ b/drivers/media/video/davinci/vpfe_capture.c >> @@ -1787,61 +1787,87 @@ static struct vpfe_device *vpfe_initialize(void) >> return vpfe_dev; >> } >> >> +/** >> + * vpfe_disable_clock() - Disable clocks for vpfe capture driver >> + * @vpfe_dev - ptr to vpfe capture device >> + * >> + * Disables clocks defined in vpfe configuration. >> + */ >> static void vpfe_disable_clock(struct vpfe_device *vpfe_dev) >> { >> struct vpfe_config *vpfe_cfg = vpfe_dev->cfg; >> + int i; >> >> - clk_disable(vpfe_cfg->vpssclk); >> - clk_put(vpfe_cfg->vpssclk); >> - clk_disable(vpfe_cfg->slaveclk); >> - clk_put(vpfe_cfg->slaveclk); >> - v4l2_info(vpfe_dev->pdev->driver, >> - "vpfe vpss master & slave clocks disabled\n"); >> + for (i = 0; i < vpfe_cfg->num_clocks; i++) { >> + clk_disable(vpfe_dev->clks[i]); >> + clk_put(vpfe_dev->clks[i]); > >While cleaning this up, you should move the clk_put() to module >disable/unload time. You dont' need to put he clock on every disable. >The same for clk_get(). You don't need to get the clock for every >enable. Just do a clk_get() at init time. > >> + } >> + kfree(vpfe_dev->clks); >> + v4l2_info(vpfe_dev->pdev->driver, "vpfe capture clocks disabled\n"); >> } >> >> +/** >> + * vpfe_enable_clock() - Enable clocks for vpfe capture driver >> + * @vpfe_dev - ptr to vpfe capture device >> + * >> + * Enables clocks defined in vpfe configuration. The function >> + * assumes that at least one clock is to be defined which is >> + * true as of now. re-visit this if this assumption is not true >> + */ >> static int vpfe_enable_clock(struct vpfe_device *vpfe_dev) >> { >> struct vpfe_config *vpfe_cfg = vpfe_dev->cfg; >> - int ret = -ENOENT; >> + int i; >> >> - vpfe_cfg->vpssclk = clk_get(vpfe_dev->pdev, "vpss_master"); > >Using my clkdevs from above, you just need to change this to: > > vpfe_cfg->vpssclk = clk_get(vpfe_dev->pdev, "master"); > >Now that the device name is in the clkdev node, clk_get() will >find the right clock based on the device name. > >> - if (NULL == vpfe_cfg->vpssclk) { >> - v4l2_err(vpfe_dev->pdev->driver, "No clock defined for" >> - "vpss_master\n"); >> - return ret; >> - } > >> + if (!vpfe_cfg->num_clocks) >> + return 0; >> >> - if (clk_enable(vpfe_cfg->vpssclk)) { >> - v4l2_err(vpfe_dev->pdev->driver, >> - "vpfe vpss master clock not enabled\n"); >> - goto out; >> - } >> - v4l2_info(vpfe_dev->pdev->driver, >> - "vpfe vpss master clock enabled\n"); >> + vpfe_dev->clks = kzalloc(vpfe_cfg->num_clocks * >> + sizeof(struct clock *), GFP_KERNEL); >> >> - vpfe_cfg->slaveclk = clk_get(vpfe_dev->pdev, "vpss_slave"); > >And here: > > vpfe_cfg->slaveclk = clk_get(vpfe_dev->pdev, "slave"); > >> - if (NULL == vpfe_cfg->slaveclk) { >> - v4l2_err(vpfe_dev->pdev->driver, >> - "No clock defined for vpss slave\n"); >> - goto out; >> + if (NULL == vpfe_dev->clks) { >> + v4l2_err(vpfe_dev->pdev->driver, "Memory allocation failed\n"); >> + return -ENOMEM; >> } >> >> - if (clk_enable(vpfe_cfg->slaveclk)) { >> - v4l2_err(vpfe_dev->pdev->driver, >> - "vpfe vpss slave clock not enabled\n"); >> - goto out; >> + for (i = 0; i < vpfe_cfg->num_clocks; i++) { >> + if (NULL == vpfe_cfg->clocks[i]) { >> + v4l2_err(vpfe_dev->pdev->driver, >> + "clock %s is not defined in vpfe config\n", >> + vpfe_cfg->clocks[i]); >> + goto out; >> + } >> + >> + vpfe_dev->clks[i] = clk_get(vpfe_dev->pdev, >> + vpfe_cfg->clocks[i]); >> + if (NULL == vpfe_dev->clks[i]) { >> + v4l2_err(vpfe_dev->pdev->driver, >> + "Failed to get clock %s\n", >> + vpfe_cfg->clocks[i]); >> + goto out; >> + } >> + >> + if (clk_enable(vpfe_dev->clks[i])) { >> + v4l2_err(vpfe_dev->pdev->driver, >> + "vpfe clock %s not enabled\n", >> + vpfe_cfg->clocks[i]); >> + goto out; >> + } >> + >> + v4l2_info(vpfe_dev->pdev->driver, "vpss clock %s enabled", >> + vpfe_cfg->clocks[i]); >> } >> - v4l2_info(vpfe_dev->pdev->driver, "vpfe vpss slave clock enabled\n"); >> return 0; >> out: >> - if (vpfe_cfg->vpssclk) >> - clk_put(vpfe_cfg->vpssclk); >> - if (vpfe_cfg->slaveclk) >> - clk_put(vpfe_cfg->slaveclk); >> - >> - return -1; >> + for (i = 0; i < vpfe_cfg->num_clocks; i++) { >> + if (vpfe_dev->clks[i]) >> + clk_put(vpfe_dev->clks[i]); >> + } >> + kfree(vpfe_dev->clks); >> + return -EFAULT; >> } >> >> + >> /* >> * vpfe_probe : This function creates device entries by register >> * itself to the V4L2 driver and initializes fields of each >> diff --git a/include/media/davinci/vpfe_capture.h >b/include/media/davinci/vpfe_capture.h >> index d863e5e..7b62a5c 100644 >> --- a/include/media/davinci/vpfe_capture.h >> +++ b/include/media/davinci/vpfe_capture.h >> @@ -31,8 +31,6 @@ >> #include <media/videobuf-dma-contig.h> >> #include <media/davinci/vpfe_types.h> >> >> -#define VPFE_CAPTURE_NUM_DECODERS 5 >> - >> /* Macros */ >> #define VPFE_MAJOR_RELEASE 0 >> #define VPFE_MINOR_RELEASE 0 >> @@ -91,9 +89,14 @@ struct vpfe_config { >> char *card_name; >> /* ccdc name */ >> char *ccdc; >> - /* vpfe clock */ >> + /* vpfe clock. Obsolete! Will be removed in next patch */ > >I'd drop these comment additions and just comment in the follow up patch >why they were removed. > >> struct clk *vpssclk; >> + /* Obsolete! Will be removed in next patch */ >> struct clk *slaveclk; >> + /* number of clocks */ >> + int num_clocks; >> + /* clocks used for vpfe capture */ >> + char *clocks[]; >> }; >> >> struct vpfe_device { >> @@ -104,6 +107,8 @@ struct vpfe_device { >> struct v4l2_subdev **sd; >> /* vpfe cfg */ >> struct vpfe_config *cfg; >> + /* clock ptrs for vpfe capture */ >> + struct clk **clks; >> /* V4l2 device */ >> struct v4l2_device v4l2_dev; >> /* parent device */ >> -- >> 1.6.0.4 > >Kevin -- To unsubscribe from this list: send the line "unsubscribe linux-media" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
