linux-kernel - RE: Fwd: [PATCH v6 04/12] mmc: mmci: Add Qcom datactrl register variant

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Date:	Thu, 17 Jul 2014 06:26:39 -0400 (EDT)
From:	prakash.burla@...rtplayin.com
To:	srinivas.kandagatla@...aro.org
Cc:	linux@....linux.org.uk, ulf.hansson@...aro.org,
	linux-mmc@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-arm-msm@...r.kernel.org
Subject: RE: Fwd: [PATCH v6 04/12] mmc: mmci: Add Qcom datactrl register variant

tested-by: Prakash Burla <prakash.burla@...rtplayin.com>
This driver tested on AP806X with mmc Driver.

----------------------------------------------------------------------------------
From:  <srinivas.kandagatla@...aro.org>
Date: Mon, Jun 2, 2014 at 2:39 PM
Subject: [PATCH v6 04/12] mmc: mmci: Add Qcom datactrl register variant
To: Russell King <linux@....linux.org.uk>, Ulf Hansson
<ulf.hansson@...aro.org>, linux-mmc@...r.kernel.org
Cc: Chris Ball <chris@...ntf.net>, linux-kernel@...r.kernel.org,
linux-arm-msm@...r.kernel.org, linus.walleij@...aro.org, Srinivas


From: Srinivas Kandagatla <srinivas.kandagatla@...aro.org>

Instance of this IP on Qualcomm's SOCs has bit different layout for datactrl
register. Bit position datactrl[16:4] hold the true block size instead of power
of 2.

Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
Reviewed-by: Linus Walleij <linus.walleij@...aro.org>
---
 drivers/mmc/host/mmci.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/mmc/host/mmci.c b/drivers/mmc/host/mmci.c
index ed20bf5..72981f6 100644
--- a/drivers/mmc/host/mmci.c
+++ b/drivers/mmc/host/mmci.c
@@ -60,6 +60,8 @@ static unsigned int fmax = 515633;
  * @sdio: variant supports SDIO
  * @st_clkdiv: true if using a ST-specific clock divider algorithm
  * @blksz_datactrl16: true if Block size is at b16..b30 position in
datactrl register
+ * @blksz_datactrl4: true if Block size is at b4..b16 position in datactrl
+ *                  register
  * @pwrreg_powerup: power up value for MMCIPOWER register
  * @signal_direction: input/out direction of bus signals can be indicated
  * @pwrreg_clkgate: MMCIPOWER register must be used to gate the clock
@@ -75,6 +77,7 @@ struct variant_data {
        bool                    sdio;
        bool                    st_clkdiv;
        bool                    blksz_datactrl16;
+       bool                    blksz_datactrl4;
        u32                     pwrreg_powerup;
        bool                    signal_direction;
        bool                    pwrreg_clkgate;
@@ -731,6 +734,8 @@ static void mmci_start_data(struct mmci_host
*host, struct mmc_data *data)

        if (variant->blksz_datactrl16)
                datactrl = MCI_DPSM_ENABLE | (data->blksz << 16);
+       else if (variant->blksz_datactrl4)
+               datactrl = MCI_DPSM_ENABLE | (data->blksz << 4);
        else
                datactrl = MCI_DPSM_ENABLE | blksz_bits << 4;

--
1.9.1

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