<p>How long does it take to ramp up the clock, are there blit operations where the clock change could take longer than the blit (such as partial updates)?</p>
<p>--<br>
Timothy Meade<br>
tmzt on freenode</p>
<div class="gmail_quote">On Mar 18, 2011 5:59 PM, "Carl Vanderlip" <<a href="mailto:carlv@codeaurora.org">carlv@codeaurora.org</a>> wrote:<br type="attribution">> This makes sure that the MDP (locked to AXI) and the AXI/ABI1 run at the<br>
> maximum frequency during blit operations.<br>> <br>> Authors:<br>> Dima Zavin <<a href="mailto:dima@android.com">dima@android.com</a>><br>> Rebecca Schultz Zavin <<a href="mailto:rebecca@android.com">rebecca@android.com</a>><br>
> Colin Cross <<a href="mailto:ccross@android.com">ccross@android.com</a>><br>> <br>> Signed-off-by: Carl Vanderlip <<a href="mailto:carlv@codeaurora.org">carlv@codeaurora.org</a>><br>> ---<br>> drivers/video/msm/mdp.c | 11 +++++++++++<br>
> drivers/video/msm/mdp_hw.h | 1 +<br>> 2 files changed, 12 insertions(+), 0 deletions(-)<br>> <br>> diff --git a/drivers/video/msm/mdp.c b/drivers/video/msm/mdp.c<br>> index b03204d..0bb19fa 100644<br>
> --- a/drivers/video/msm/mdp.c<br>> +++ b/drivers/video/msm/mdp.c<br>> @@ -52,6 +52,7 @@ static int locked_enable_mdp_irq(struct mdp_info *mdp, uint32_t mask)<br>> }<br>> /* if the mdp irq is not already enabled enable it */<br>
> if (!mdp_irq_mask) {<br>> + clk_set_rate(mdp->ebi1_clk, 128000000);<br>> clk_enable(mdp->clk);<br>> enable_irq(mdp->irq);<br>> }<br>> @@ -656,6 +657,13 @@ int mdp_probe(struct platform_device *pdev)<br>
> goto error_get_mdp_clk;<br>> }<br>> <br>> + mdp->ebi1_clk = clk_get(NULL, "ebi1_clk");<br>> + if (IS_ERR(mdp->ebi1_clk)) {<br>> + pr_err("mdp: failed to get ebi1 clk\n");<br>
> + ret = PTR_ERR(mdp->ebi1_clk);<br>> + goto error_get_ebi1_clk;<br>> + }<br>> +<br>> ret = request_irq(mdp->irq, mdp_isr, IRQF_DISABLED, "msm_mdp", mdp);<br>> if (ret)<br>> goto error_request_irq;<br>
> @@ -681,6 +689,9 @@ int mdp_probe(struct platform_device *pdev)<br>> error_device_register:<br>> free_irq(mdp->irq, mdp);<br>> error_request_irq:<br>> + clk_put(mdp->ebi1_clk);<br>> +error_get_ebi1_clk:<br>
> + clk_put(mdp->clk);<br>> error_get_mdp_clk:<br>> error_mddi_pmdh_register:<br>> iounmap(mdp->base);<br>> diff --git a/drivers/video/msm/mdp_hw.h b/drivers/video/msm/mdp_hw.h<br>> index fdf9e5e..7485a9e 100644<br>
> --- a/drivers/video/msm/mdp_hw.h<br>> +++ b/drivers/video/msm/mdp_hw.h<br>> @@ -46,6 +46,7 @@ struct mdp_info {<br>> char * __iomem base;<br>> int irq;<br>> struct clk *clk;<br>> + struct clk *ebi1_clk;<br>
> struct mdp_out_interface out_if[MSM_MDP_NUM_INTERFACES];<br>> int format;<br>> int pack_pattern;<br>> -- <br>> Sent by an employee of the Qualcomm Innovation Center, Inc.<br>> The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum.<br>
> <br>> --<br>> To unsubscribe from this list: send the line "unsubscribe linux-arm-msm" in<br>> the body of a message to <a href="mailto:majordomo@vger.kernel.org">majordomo@vger.kernel.org</a><br>> More majordomo info at <a href="http://vger.kernel.org/majordomo-info.html">http://vger.kernel.org/majordomo-info.html</a><br>
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