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Message-ID: <583ab75b-4a54-d928-2827-33fc4126ad46@linaro.org>
Date: Thu, 3 Aug 2017 12:50:05 +0100
From: Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
To: Adrian Hunter <adrian.hunter@...el.com>, ulf.hansson@...aro.org
Cc: linux-mmc@...r.kernel.org, linux-kernel@...r.kernel.org,
linux-arm-msm@...r.kernel.org
Subject: Re: [PATCH v2 1/2] mmc: sdhci: add sdma_buffer_boundary_arg member to
sdhci_host
On 03/08/17 12:39, Adrian Hunter wrote:
> On 02/08/17 11:38, srinivas.kandagatla@...aro.org wrote:
>> From: Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
>>
>> This patch adds sdma_buffer_boundary_arg member to struct sdhci_host to
>> give more flexibility to drivers to control the sdma boundary buffer value
>> and also to fix issue on some sdhci controllers which are broken when
>> HOST SDMA Buffer Boundary is programmed in Block Size Register (0x04)
>> when using ADMA. Qualcomm sdhci controller is one of such type, writing
>> to this bits is un-supported.
>>
>> Default value of sdma_buffer_boundary_arg is set to SDHCI_DEFAULT_BOUNDARY_ARG.
>>
>> Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
>
> There are a couple of minor suggestions below
>
>> ---
>> drivers/mmc/host/sdhci.c | 14 ++++++++++----
>> drivers/mmc/host/sdhci.h | 3 +++
>> 2 files changed, 13 insertions(+), 4 deletions(-)
>>
>> diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c
>> index ecd0d4350e8a..4a7b5dcfc55b 100644
>> --- a/drivers/mmc/host/sdhci.c
>> +++ b/drivers/mmc/host/sdhci.c
>> @@ -897,7 +897,7 @@ static void sdhci_prepare_data(struct sdhci_host *host, struct mmc_command *cmd)
>> sdhci_set_transfer_irqs(host);
>>
>> /* Set the DMA boundary value and block size */
>> - sdhci_writew(host, SDHCI_MAKE_BLKSZ(SDHCI_DEFAULT_BOUNDARY_ARG,
>> + sdhci_writew(host, SDHCI_MAKE_BLKSZ(host->sdma_buffer_boundary_arg,
>> data->blksz), SDHCI_BLOCK_SIZE);
>> sdhci_writew(host, data->blocks, SDHCI_BLOCK_COUNT);
>> }
>> @@ -2037,6 +2037,7 @@ static void sdhci_send_tuning(struct sdhci_host *host, u32 opcode)
>> struct mmc_command cmd = {};
>> struct mmc_request mrq = {};
>> unsigned long flags;
>> + u32 barg = host->sdma_buffer_boundary_arg;
>
> Might as well use a 2-character variable name and avoid the line wrapping
> e.g. 'barg' -> 'sb'
Sure, that would work.
>
>>
>> spin_lock_irqsave(&host->lock, flags);
>>
>> @@ -2052,9 +2053,11 @@ static void sdhci_send_tuning(struct sdhci_host *host, u32 opcode)
>> */
>> if (cmd.opcode == MMC_SEND_TUNING_BLOCK_HS200 &&
>> mmc->ios.bus_width == MMC_BUS_WIDTH_8)
>> - sdhci_writew(host, SDHCI_MAKE_BLKSZ(7, 128), SDHCI_BLOCK_SIZE);
>> + sdhci_writew(host,
>> + SDHCI_MAKE_BLKSZ(barg, 128), SDHCI_BLOCK_SIZE);
>> else
>> - sdhci_writew(host, SDHCI_MAKE_BLKSZ(7, 64), SDHCI_BLOCK_SIZE);
>> + sdhci_writew(host,
>> + SDHCI_MAKE_BLKSZ(barg, 64), SDHCI_BLOCK_SIZE);
>>
>> /*
>> * The tuning block is sent by the card to the host controller.
>> @@ -2998,7 +3001,8 @@ void sdhci_cqe_enable(struct mmc_host *mmc)
>> ctrl |= SDHCI_CTRL_ADMA32;
>> sdhci_writeb(host, ctrl, SDHCI_HOST_CONTROL);
>>
>> - sdhci_writew(host, SDHCI_MAKE_BLKSZ(SDHCI_DEFAULT_BOUNDARY_ARG, 512),
>> + sdhci_writew(host,
>> + SDHCI_MAKE_BLKSZ(host->sdma_buffer_boundary_arg, 512),
>> SDHCI_BLOCK_SIZE);
>>
>> /* Set maximum timeout */
>> @@ -3119,6 +3123,8 @@ struct sdhci_host *sdhci_alloc_host(struct device *dev,
>>
>> host->tuning_delay = -1;
>>
>> + host->sdma_buffer_boundary_arg = SDHCI_DEFAULT_BOUNDARY_ARG;
>> +
>> return host;
>> }
>>
>> diff --git a/drivers/mmc/host/sdhci.h b/drivers/mmc/host/sdhci.h
>> index 0469fa191493..6ff2294e55b3 100644
>> --- a/drivers/mmc/host/sdhci.h
>> +++ b/drivers/mmc/host/sdhci.h
>> @@ -541,6 +541,9 @@ struct sdhci_host {
>> /* Delay (ms) between tuning commands */
>> int tuning_delay;
>>
>> + /* Host SDMA buffer boundary. */
>> + u32 sdma_buffer_boundary_arg;
>
> The name seems a bit long. What about just 'sdma_boundary'?
>
sounds good, I will spin a new version with sdma_boundary .
thanks,
srini
>> +
>> unsigned long private[0] ____cacheline_aligned;
>> };
>>
>>
>
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