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-0700 (PDT) Subject: Re: [PATCH v1 03/11] soc: mediatek: cmdq: add write_s function To: Dennis YC Hsieh , Philipp Zabel , David Airlie , Daniel Vetter , CK Hu , Bibby Hsieh , Houlong Wei Cc: dri-devel@lists.freedesktop.org, linux-arm-kernel@lists.infradead.org, linux-mediatek@lists.infradead.org, linux-kernel@vger.kernel.org, wsd_upstream@mediatek.com, HS Liao References: <1592749115-24158-1-git-send-email-dennis-yc.hsieh@mediatek.com> <1592749115-24158-4-git-send-email-dennis-yc.hsieh@mediatek.com> From: Matthias Brugger Autocrypt: addr=matthias.bgg@gmail.com; prefer-encrypt=mutual; keydata= mQINBFP1zgUBEAC21D6hk7//0kOmsUrE3eZ55kjc9DmFPKIz6l4NggqwQjBNRHIMh04BbCMY fL3eT7ZsYV5nur7zctmJ+vbszoOASXUpfq8M+S5hU2w7sBaVk5rpH9yW8CUWz2+ZpQXPJcFa OhLZuSKB1F5JcvLbETRjNzNU7B3TdS2+zkgQQdEyt7Ij2HXGLJ2w+yG2GuR9/iyCJRf10Okq gTh//XESJZ8S6KlOWbLXRE+yfkKDXQx2Jr1XuVvM3zPqH5FMg8reRVFsQ+vI0b+OlyekT/Xe 0Hwvqkev95GG6x7yseJwI+2ydDH6M5O7fPKFW5mzAdDE2g/K9B4e2tYK6/rA7Fq4cqiAw1+u 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jzi+DzD9cvj2K6eD5j5kcKJJQactXqfJvF1Eb+OnxlB1BCLE8D1rNkPO5O742Mq3MgDmq19l +abzEL6QDAAxn9md8KwrA3RtucNh87cHlDXfUBKa7SRvBjTczDg+HEPNk2u3hrz1j3l2rliQ y1UfYx7Vk/TrdwUIJgKS8QAr8Lw9WuvY2hSqL9vEjx8VAkPWNWPwrQ== Message-ID: Date: Mon, 22 Jun 2020 13:07:07 +0200 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.9.0 MIME-Version: 1.0 In-Reply-To: <1592749115-24158-4-git-send-email-dennis-yc.hsieh@mediatek.com> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 21/06/2020 16:18, Dennis YC Hsieh wrote: > add write_s function in cmdq helper functions which > writes value contains in internal register to address > with large dma access support. > > Signed-off-by: Dennis YC Hsieh > --- > drivers/soc/mediatek/mtk-cmdq-helper.c | 19 +++++++++++++++++++ > include/linux/mailbox/mtk-cmdq-mailbox.h | 1 + > include/linux/soc/mediatek/mtk-cmdq.h | 19 +++++++++++++++++++ > 3 files changed, 39 insertions(+) > > diff --git a/drivers/soc/mediatek/mtk-cmdq-helper.c b/drivers/soc/mediatek/mtk-cmdq-helper.c > index bf32e3b2ca6c..817a5a97dbe5 100644 > --- a/drivers/soc/mediatek/mtk-cmdq-helper.c > +++ b/drivers/soc/mediatek/mtk-cmdq-helper.c > @@ -18,6 +18,10 @@ struct cmdq_instruction { > union { > u32 value; > u32 mask; > + struct { > + u16 arg_c; > + u16 src_reg; > + }; > }; > union { > u16 offset; > @@ -222,6 +226,21 @@ int cmdq_pkt_write_mask(struct cmdq_pkt *pkt, u8 subsys, > } > EXPORT_SYMBOL(cmdq_pkt_write_mask); > > +int cmdq_pkt_write_s(struct cmdq_pkt *pkt, u16 high_addr_reg_idx, > + u16 addr_low, u16 src_reg_idx) > +{ Do I understand correctly that we use CMDQ_ADDR_HIGH(addr) and CMDQ_ADDR_LOW(addr) to calculate in the client high_addr_reg_idx and addr_low respectively? In that case I think a better interface would be to pass the address and do the high/low calculation in the cmdq_pkt_write_s Regards, Matthias > + struct cmdq_instruction inst = {}; > + > + inst.op = CMDQ_CODE_WRITE_S; > + inst.src_t = CMDQ_REG_TYPE; > + inst.sop = high_addr_reg_idx; > + inst.offset = addr_low; > + inst.src_reg = src_reg_idx; > + > + return cmdq_pkt_append_command(pkt, inst); > +} > +EXPORT_SYMBOL(cmdq_pkt_write_s); > + > int cmdq_pkt_wfe(struct cmdq_pkt *pkt, u16 event) > { > struct cmdq_instruction inst = { {0} }; > diff --git a/include/linux/mailbox/mtk-cmdq-mailbox.h b/include/linux/mailbox/mtk-cmdq-mailbox.h > index 121c3bb6d3de..ee67dd3b86f5 100644 > --- a/include/linux/mailbox/mtk-cmdq-mailbox.h > +++ b/include/linux/mailbox/mtk-cmdq-mailbox.h > @@ -59,6 +59,7 @@ enum cmdq_code { > CMDQ_CODE_JUMP = 0x10, > CMDQ_CODE_WFE = 0x20, > CMDQ_CODE_EOC = 0x40, > + CMDQ_CODE_WRITE_S = 0x90, > CMDQ_CODE_LOGIC = 0xa0, > }; > > diff --git a/include/linux/soc/mediatek/mtk-cmdq.h b/include/linux/soc/mediatek/mtk-cmdq.h > index 83340211e1d3..e1c5a7549b4f 100644 > --- a/include/linux/soc/mediatek/mtk-cmdq.h > +++ b/include/linux/soc/mediatek/mtk-cmdq.h > @@ -12,6 +12,8 @@ > #include > > #define CMDQ_NO_TIMEOUT 0xffffffffu > +#define CMDQ_ADDR_HIGH(addr) ((u32)(((addr) >> 16) & GENMASK(31, 0))) > +#define CMDQ_ADDR_LOW(addr) ((u16)(addr) | BIT(1)) > > struct cmdq_pkt; > > @@ -103,6 +105,23 @@ int cmdq_pkt_write_mask(struct cmdq_pkt *pkt, u8 subsys, > u16 offset, u32 value, u32 mask); > > /** > + * cmdq_pkt_write_s() - append write_s command to the CMDQ packet > + * @pkt: the CMDQ packet > + * @high_addr_reg_idx: internal register ID which contains high address of pa > + * @addr_low: low address of pa > + * @src_reg_idx: the CMDQ internal register ID which cache source value > + * > + * Return: 0 for success; else the error code is returned > + * > + * Support write value to physical address without subsys. Use CMDQ_ADDR_HIGH() > + * to get high address and call cmdq_pkt_assign() to assign value into internal > + * reg. Also use CMDQ_ADDR_LOW() to get low address for addr_low parameter when > + * call to this function. > + */ > +int cmdq_pkt_write_s(struct cmdq_pkt *pkt, u16 high_addr_reg_idx, > + u16 addr_low, u16 src_reg_idx); > + > +/** > * cmdq_pkt_wfe() - append wait for event command to the CMDQ packet > * @pkt: the CMDQ packet > * @event: the desired event type to "wait and CLEAR" >